CN103616500A - Clothing pressure evaluation method based on event-related-potential technology - Google Patents
Clothing pressure evaluation method based on event-related-potential technology Download PDFInfo
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Abstract
The invention relates to a clothing pressure evaluation method based on an event-related-potential technology. The clothing pressure evaluation method comprises the steps of respectively applying experiment stimulation to a testee in a non clothing-pressure state and a clothing-pressure state, and recording corresponding brain waves; respectively calculating the multiple covariance of a component P3a, a component P3b and a component CNV (contingent negative variation) in the recorded brain waves in the non clothing-pressure state and the clothing-pressure state; analyzing and comparing the calculated multiple covariance of the component P3a, the component P3b and the component CNV, and evaluating the comfortableness of the clothing pressure. According to the clothing pressure evaluation method based on the event-related-potential technology, the analysis and the comparison of the calculation results show that the event-related-potential technology can effectively evaluate the clothing pressure, and an objective evaluation standard is supplied to eye evaluation of functional pressure clothes; furthermore, effects of instructing and checking the design of pressure clothes products in the future are achieved.
Description
Technical field
The present invention relates to method, particularly the garment pressure evaluation method based on event related potential technology that a kind of garment pressure is evaluated.
Technical background
Study on pressure comfort of clothing research method is divided into subjective research method and objective approach generally.Subjective research method is usually directed to study on pressure comfort of clothing questionnaire.Questionnaire content generally comprises constriction, comfort, and profile satisfactions etc., adopt multistage scale to measure.Objective approach is mainly with studying in conjunction with mechanics, physiology physics, psychophysical measuring method.
In clothes method for objectively evaluating, psychology objective evaluation is a difficult problem, subjectivity and the random problem of questionnaire formal adjoint in comfortable features of clothing evaluation, psychological activity has again instantaneity and is difficult to the problems such as detection, evaluation, these make the objective Psychological Assessment of clothes, and all rare research sets foot in so far.The epoch of more being paid much attention in problems such as memory, study, brain cognition also becomes the focus of social concerns, yet study on pressure comfort of clothing is considerably less for the research of the cognitive impact of brain, only has several pieces of reports that carry out study on pressure comfort of clothing research based on brain power technology.
2002, Japanese scholars is the research of " effect and the comfortableness of middle aged and aged women dress body shaping pants---from the early reaction analysis of beats, skin temperature and brain wave ", by four of brain wave frequency band δ ripples, θ ripple, α ripple and β ripples are carried out to frequency analysis, to there being the forward lean under pressure and pressure-less state to investigate with the reply that recovers the α ripple of quiet posture.It is lower that result is that the frequency of occurrences of α ripple is compared when without pressure when having pressure, and β ripple has increased.The compressing constraint that conclusion is Clothing Pressure to human body, has all produced impact for autonomic nerve and the central nervous system of human body.2012, Wang Yipei is tested and has been extracted two brain wave indexs by eeg monitoring---and represent left side occipitalia α wave energy number percent and the right side occipitalia α wave energy number percent of positive mood, and find that left side occipitalia α wave energy number percent and upper body mean pressure have marked positive correlation.
For understanding psychology and corresponding cerebration thereof, seek the interactive relation between brain cognitive activities and garment pressure, event related potential technology is an extraordinary instrument.Event related potential (Event-Related-potentials) extracts based on brain wave.As different in behavior observation, questionnaire, scale etc. from traditional methods psychological research, the event related potential that nineteen sixty-five Sutton starts, provides a more objective and simple and feasible method for probing into cerebral function.So-called event related potential, when additional a kind of specific stimulation, acts on a certain position of sensory system or brain, is stimulating or is cancelling the potential change that stimulation Shi，Nao district causes.This technology has constant, the advantage such as waveform is constant, temporal resolution is high, equipment is simple in latent period because of it, and just studied field is widely used, but there is no the research that use case related potential carries out study on pressure comfort of clothing evaluation both at home and abroad.
At present, the research of event related potential has been deep into a plurality of fields such as psychology, physiology, medical science, Neuscience, artificial intelligence, has found the many and closely-related composition of cognitive activities process.
P3 family is the classical composition of event related potential, select P3a and P3b as the design develop type underwear pressure key component that cognition affects on brain, reason is as follows: event related potential technology is particularly suitable for those relatively easy separated compositions, or the problem proposing can avoid identifying certain specificity event related potential composition completely.But there are some general principles can reference, for example, focus on specific component, use ripe test operation, focus on large composition, focus on segregative one-tenth and grade.STEVEN J.LUCK once also mentioned in " event related potential basis " book, and the Induced by Stimulation often not occurring goes out than a much bigger P3 ripple of frequent stimulation.The phenomenon that in the past thousands of Oddball tests that Here it is are found.If just set foot in event related potential research, can do so such Oddball test as practice for the first time.Do so not only simple but also can be result and test reference and the comparison delivered in a large number.In view of this research has exploration, therefore chosen two subcomponent P3a of P300 and P3b as investigating composition.
Contingent negative variation CNV(Contingent Negative Variation) be the event related potential composition relevant to motion, in 1964, by reported first such as Walter, " S1-S2 " normal form was typical CNV test normal form.CNV is the event related potential composition relevant with execution to Motor preparation, and the Chinese scholar Wei Jing Chinese has carried out systematic study to the mechanism of CNV, and he thinks that CNV relates to the psychological factors such as orientating reaction, conation, expectation, attention, motivation.At present, the evaluation that is applied to medical science cognitive function of CNV, as Parkinson's disease, schizophrenia, dementia, chronic ache etc.1973 by Weerts, within 1974, by Loveless and Sanford, proposed, by, morning, composition formed towards ripple and two compositions of more altricial minute expectancy wave CNV, compared with precocity, divided expectancy wave (orientation wave, O ripple), more altricial minute expectancy wave (expectance wave, E ripple).
Summary of the invention
The present invention uses physiological psychology principle, by event related potential system, explores people when having or not negative pressure, and the cognitive behavior of human brain changes.Find the index and the Changing Pattern thereof that between event related potential and pressure comfort, are associated; For the pressure comfort evaluation of functional pressure garments provides objective appraisal standard; Check and guides pressure garments product design from now on.
The technology of the present invention focuses on using physiological psychology, computer science, and the multidisciplinary research means combining such as Cognitive Neuroscience, usings objective brain electric information as perception evaluation criterion, and research garment pressure is for the impact of brain Cognition Mechanism.The present invention attempts to set up the method for the comfortable and perception objective evaluation of research garment pressure.
According to an aspect of the present invention, provide a kind of study on pressure comfort of clothing evaluation method based on event related potential technology, the method comprises
Experimenter is applied respectively and tests stimulation with having under garment pressure state under without garment pressure state, and record corresponding brain wave;
Calculate respectively without under garment pressure state and have lower multiple covariance that records P3a composition in brain wave, P3b composition and CNV composition of garment pressure state;
Multiple covariance by the P3a composition to calculating, P3b composition and CNV composition is analyzed contrast, and study on pressure comfort of clothing is evaluated.
Preferably, with tristimulus Oddball normal form and/or S1-S2 normal form, apply described stimulation.
Preferably, described experimenter's selection standard is BMI >=23, and BMI is zaftig level index.
Preferably, described without garment pressure state and have garment pressure state to be selected from the subjective assessment grade of experimenter to garment pressure state.
Preferably, subjective assessment grade is divided into power sense with no pressure, light pressure sense, moderate, feeling of stress is large and very large five kinds of feeling of stress.
Preferably, described in, having the subjective assessment grade that garment pressure state is corresponding is that feeling of stress is larger.
Preferably, described experimenter determines experimental sequence in pseudorandom mode.
Preferably, the method further comprises that determine characterizing experimenter feels the tested subjective experiment that takes the subjective assessment grade of constriction.
Beneficial effect
By this method, provide a kind of method for objectively evaluating of evaluating garment pressure based on event related potential.For the pressure comfort evaluation of functional pressure garments provides objective perception evaluation criterion, and play and instruct and role of inspection for pressure garments product design from now on.
Accompanying drawing explanation
Fig. 1 is that event related potential composition schematic diagram is chosen in this test;
Fig. 2 is this process of the test schematic diagram;
Fig. 3 is that the presentation modes of stimulus information and number of subjects are according to typing pattern diagram;
Fig. 4 is that recording electrode is arranged schematic diagram;
Fig. 5 is tristimulus Oddball normal form stimulus material schematic diagram;
Fig. 6 is S1-S2 normal form stimulus material schematic diagram;
Fig. 7 is 9 electrode average waveform figure of P3a;
Fig. 8 is P3a brain electrical activity mapping;
Fig. 9 is 9 electrode average waveform figure of P3b;
Figure 10 is P3b brain electrical activity mapping;
Figure 11 is 9 electrode average waveform figure of CNV;
Figure 12 is CNV brain electrical activity mapping;
Figure 13 is that CNV analyzes time point schematic diagram;
Figure 14 is the total schematic diagram of analysis of experiments result.
Embodiment
1-14 in conjunction with the preferred embodiments of the present invention, technical scheme of the present invention is described, feature and beneficial effect below with reference to accompanying drawings.
As shown in Figure 1, test as test acquisition target, is carried out concrete test operation by the process of the test shown in Fig. 2 by the P3a in the P300 family of usining in event related potential and P3b brain wave and CNV brain wave simultaneously.In embodiments of the invention, experimenter is the young women that education level is suitable, wherein Oddball normal form chosen 10 tested, S1-S2 normal form chosen 16 tested, the range of age 20～25 years old, be dextro manuality, eyesight or correct defects of vision normal, normal intelligence, without colour blindness anomalous trichromatism, without other mental diseases.It will be understood by those skilled in the art that the experiment of brain electricity itself is less demanding to experimenter's sample size, the stacking fold of event related potential experiment not only depends on experiment number, is also the repetitive stimulation number that everyone participates in.In a preferred embodiment according to the present invention, every of the target stimulation that 10 experimenters is applied to tristimulus Oddball normal form repeats 60 times, 60 * 10 people=600 time; 8 every of experimenters are applied to S2 in S1-S2 normal form stimulates every to repeat 45 times, 45 * 16 people=720 time.Therefore, the stacking fold with these experimenters illustrates technical scheme of the present invention and technique effect.
Subjective test
In order to choose applicable tested clothes, first need constriction or the constraint by the method for subjective test, for experimenter, felt to feel, tentatively choose corresponding tested clothes.
Subjective test is the compressing value that the record of experiencing constriction according to experimenter represents to oppress grade.Experimenter's dress and self big or small tested clothes that mate in test, tested clothes under different pressures are made to subjective assessment, in feeling of stress, be moderate in the extremely strong scope of feeling of stress, select one of numerical value 1 to 5 to represent to wear the subjective pressure experience that tested clothes are experienced, wherein 1 indicates without feeling of stress, 2 represent light pressure sense, and 3 expressions are moderate, and 4 represent that feelings of stress represent that with 5 feeling of stress is very large greatly.The evaluation of impression be can be as accurate as after radix point to the numerical value of one.The time that experimenter wears different pressures impression examination clothes is about 10 minutes.First, according to these five value classes, investigate the sensation that experimenter wears adjusting type underwear separately, then choosing compressing value, to be more than or equal to 4(pressure larger) adjusting type underwear as tested clothes, to guarantee the tested tested clothes that subjective constriction is stronger of selecting.
After subjective assessment has been tested, experimenter wears loose clothing, in loosening under stationary state to carry out subsequently event related potential wearing test.
Brain wave test
In order to verify the feasibility of technical solution of the present invention, require experimenter initiatively to participate in to a certain extent at the trial cognitive activities, in an embodiment of the present invention, the change that experimenter sits quietly before computer with computer screen applies the mode of stimulation experimenter is measured.Before test, allow experimenter wear electrode cap, tranquil a period of time, after entering rest state, experimenter starts test, can access brain wave stably like this.
Eeg recording is for referencial use with nose, recording level eye electricity and vertical eye electricity.Electrode and skin contact impedance are less than 5K Ω.10-20 electrode lead localization criteria electrodes that adopt international electroencephalography to demarcate in the present invention, the title that position is corresponding and electrode code name are as shown in table 1.Be illustrated in figure 4 according to this test and need the brain electrode position of arranging.
For the test figure in various embodiments of the present invention contrasts and evaluates, need to obtain reference test data.Reference test need to carry out under the tested clothes of experimenter's moderate pressure and non-stimulated condition.Allowing each experimenter wear feeling of stress is moderate tested clothes, and the state loosening in the whole body of naturally sitting quietly, obtains and record the brain wave under this state of each experimenter, using this brain wave as with reference to data.
The measurement of at every turn carrying out the tested clothes of different pressures grade has time enough interval and allows experimenter's relax, to keep concentrating of its notice.Experimenter wears tested clothes and carries out irritant test.By the snap close on tested clothes, adjust the tested pressure that takes, obtain the pressure rating that test needs.In the embodiment of the present invention, under pressure state, stimulate test to be divided into have pressure and without pressure, there is for example corresponding subjective assessment class 4 (feeling of stress is larger) of pressure, without pressure for example corresponding subjective assessment grade 1(without pressure), have pressure test with identical without other test conditions in pressure test.Preferably, there is pressure test and without the time of having a rest that has at least 20 minutes between pressure test, to eliminate experimenter's dress, experience.For getting rid of the impact of test sequence factor, take pseudorandom mode to carry out choosing of pressure test and testing sequence with no pressure.
Fig. 3 is that the presentation modes that stimulates and number of subjects are according to typing pattern diagram, showing as experimenter wears electrode cap and is seated at before the computing machine that presents stimulation, electrode cap is connected with amplifier, and the other end of amplifier is connected with the computing machine of digitizing electroencephalogram scanner (EEG).The computing machine that presents stimulation during test presents stimulation to experimenter, gathers experimenter's brain electric information by electrode cap, and the information collecting, through the amplification of amplifier, outputs in the computing machine of digitizing EEG.Meanwhile, the computing machine that presents stimulation can record the flag code that presents process, and flag code is corresponding with the eeg data of each electrode.
The normal form of irritant test will be specifically described below
Stimulate 1: tristimulus Oddball normal form
Shown in Fig. 5, be stimulus material schematic diagram: non-target stimulation is that blue filled circles, target stimulation are for slightly BigBlue filled circles (be difficult for telling, need focal attention to differentiate), extraneous stimulus are colored tessellate square.Test adopts tristimulus Oddball pattern.Target stimulation is 60. presentative time is respectively 150ms, and presenting probability is 12.5%; 360 of non-target stimulations, presentative time is respectively 150ms, and presenting probability is 75%; Extraneous stimulus 60 numbers, presenting probability is 12.5%, continues time 150ms respectively; The order that all stimulations occur is through pseudorandom.The continuous occurrence number of target stimulation or extraneous stimulus is no more than twice.Stimulus intervals (SOA) time is 800ms.Test is divided into three stimulus sequences, and each stimulus sequence has 160 stimulations.Require experimenter to count the slightly large filled circles in each stimulus sequence, when stimulus sequence finishes, subjects reported goes out the number of target stimulation.The brain district that the test of tristimulus Oddball normal form has the greatest impact is volume center line, the central crown and top center line.Corresponding electrode is F3, FZ, F4, C3, CZ, C4, P3, PZ, P4 with it.EEG bandwidth is 0.05～100Hz, AC sampling, and sampling rate is that 500Hz/ leads.
Stimulate 2:S1-S2 normal form
Shown in Fig. 6, be stimulus material schematic diagram: this test adopts S1-S2 normal form, concrete test design is: "+" of watching center Screen attentively, presentative time 500ms, empty screen presents 500ms, hears afterwards a sound (S1) of " stining ", S1 presentative time 50ms, empty screen presents 1800ms, if occur afterwards, positive triangle (S2) does button reaction, do not occur that positive triangle presents the empty screen of 1000ms, is after this that the empty screen of 2000～6000ms presents and enters next examination time.Test is divided into sector and three groups of tests, and it is 50%(15 that every group of test S2 presents probability).The brain area that the test of S1-S2 normal form has the greatest impact is volume center line, the central crown and top center line.Corresponding electrode is with it: F3, FZ, F4, FC3, FCZ, FC4, C3, CZ, C4.EEG bandwidth low pass 100Hz, DC sampling, sampling rate is that 1000Hz/ leads.
Test result analysis contrast
Stimulate 1: tristimulus Oddball normal form
The data situation of each electrode in the experimental data table 2 collecting according to the brain area respective electrode having the greatest impact from tristimulus Oddball normal form and table 3, and in the wave amplitude figure of P3a and P3b and electroencephalogram Fig. 7 to Figure 10, have pressure and can find out without pressure condition hypencephalon electricity curvilinear motion situation, the P3a that tristimulus Oddball normal form is brought out and P3b composition are obvious.Data situation by frontal region and central authorities top district can find out have under pressure and pressure-less state, has produced the P300 subcomponent that obvious frontal region and central authorities top district distribute.And can observe from brain wave oscillogram, have under pressure and pressure-less state, P3a is had no significant effect, P3b changes obviously.
Table 2 p3a wave amplitude information recording list position: μ V
Table 3 p3b wave amplitude information recording list position: μ V
According to data situation in the test figure table 4 collecting and table 5, can find out have the situation of change main manifestations under pressure and pressure-less state to be: in each reference electrode, all do not have significant change a latent period of P3a and P3b; In each reference electrode, P3a wave amplitude has no significant change, and P3b amplitude change is obvious, and wherein frontal region and central authorities top district amplitude change are more obvious.
Table 4 p3a information recording in latent period list position: ms
Table 5 p3b information recording in latent period list position: ms
According to the experimental data of the corresponding electrode of brain area of selected influenced maximum, carry out duplicate measurements variance analysis (ANOVA), wherein P value all uses Greenhouse-Geisser method to proofread and correct.Duplicate measurements variance analysis can directly for example used and can directly to corresponding variance F and conspicuousness P value, carry out computational analysis in SPSS software, and wherein P > 0.05 explanation is not remarkable, and P < 0.05 explanation significantly.
According to the experimental data collecting from respective electrode, carry out statistical study, analysis result is as follows:
(1), the average wave amplitude duplicate measurements of P3b variance analysis
There is the main effect under pressure or pressure-less state remarkable: by can obtain the variance of 9 factors to the analysis of data, to be F (1,9)=8,474, P=0.017 < 0.05, therefore, can show to have pressure and without two states of pressure, there were significant differences for the p3b wave amplitude that tristimulus Oddball normal form is brought out.The average wave amplitude of P3b (average M=7.700 μ V, variance MSE=1.552 μ V) that the average wave amplitude of P3b that has pressure state to bring out (average M=10.636 μ V, variance MSE=1.978 μ V) brings out during than pressure-less state is much higher.
(2), P3b average latency duplicate measurements variance analysis
There is the main effect under pressure or pressure-less state not remarkable: by can obtain the variance of 9 factors to data analysis, to be: F (1,9)=0.029, P=0.869 > 0.05, therefore, can show to have pressure and without two states of pressure, the P3b that tristimulus Oddball normal form is brought out, the difference in not free process.The P3b average latency (average M=452.800 μ V, variance MSE=17.786 μ V) bringing out while having P3b average latency (average M=451.733 μ V, variance MSE=14.679 μ V) that pressure state brings out than pressure-less state is similar.
(3), the average wave amplitude duplicate measurements of P3a variance analysis
There are pressure and stress-free main effect not remarkable: by can obtain the variance of 9 factors to data analysis, to be: F (1,9)=0.003, P=0.957 > 0.05, therefore, can show to have pressure and without two states of pressure, the P3a wave amplitude that tristimulus Oddball normal form is brought out does not have significant difference.The average wave amplitude of P3a (average M=10.578 μ V, variance MSE=1.819 μ V) that the average wave amplitude of P3a that has pressure state to bring out (average M=10.683 μ V, variance MSE=1.584 μ V) brings out while comparing without pressure is similar.
(4), P3a average latency duplicate measurements variance analysis
There are pressure and stress-free main effect not remarkable: by can obtain the variance of 9 factors to data analysis, to be: F (1,9)=0.328, P=0.581 > 0.05, therefore, can show to have pressure and without two states of pressure, the P3a that tristimulus Oddball normal form is brought out, the difference in not free process.The P3b average latency (average M=385.000 μ V, variance MSE=6.704 μ V) that has P3a average latency (average M=381.467 μ V, variance MSE=5.020 μ V) that pressure state brings out to bring out when without pressure is similar.
Experiment conclusion:
(1) have under pressure and pressure-less state P3b otherness remarkable, p3a otherness is not remarkable.Verified the feasibility of event related potential technology as garment pressure method for objectively evaluating.
(2) have under pressure and pressure-less state, not remarkable to nonvoluntary attention ability main effect, have under pressure and pressure-less state, can not affect nonvoluntary attention ability.
P3a is relevant with automatically perceiveing of novel stimulus, P3a reflected attention switching passive in experimenter's course of reaction or " towards ", P3a is the outstanding feature of orientating reaction.Because stimulating, burst there is the enough new opposite sex and intensity.Psychological activity is attracted in the past by it.The directive property of this psychological activity is imperious, is subjective out of contior.Under pressure state, there is not orientating reaction having in experimenter, compare with pressure-less state and all do not have in wave amplitude and latent period to change, again because the height of irritation level is identical, this explanation, the excitement levels of brain does not promote, the quantity of neuronal activation does not significantly change, and attentional resources does not have significant change to the sendout stimulating.There are under pressure and pressure-less state speed and the evaluation time of also do not affect the nerves activity and process simultaneously.
(3) have under pressure and pressure-less state, to selective attention ability main effect remarkable (p<0.05), have under pressure and pressure-less state, remarkable to selective attention capacity.
It is generally acknowledged: the height of wave amplitude reaction brain excitement, be speed and the evaluation time of nervous activity process latent period.And P3b is relevant with initiatively perceiveing of target stimulation, when meaning that as index experimenter reacts target stimulation, P3b keeps the ability of noting.Having under pressure state, when a target stimulation occurs, compare with pressure-less state, wave amplitude significantly promotes (p<0.05), significantly do not change (p>0.05) latent period, again because the height of irritation level is identical, and this explanation, the excitement levels of brain promotes, and attentional resources increases the sendout stimulating.Identical with nonvoluntary attention ability, degree and the evaluation time of selective attention ability nervous activity and process under two kinds of wearing effects obviously do not change.
Stimulate 2:S1-S2 normal form
According to finding out in CNV brain electrical activity mapping 11 and brain wave patterns Figure 12, the CNV composition that S1-S2 normal form is brought out is obvious.After list of references and observation ERP oscillogram, brain mapping, choose these 3 electrodes of FZ, FCZ and CZ and carry out statistics and further analyze, shown in Figure 13, make a concrete analysis of as follows:
1, latent period: 1. CNV changes the average latency of starting point A; 2. the average latency of P300 after S2.
2, wave amplitude: 1. CNV changes the average wave amplitude of starting point A; 2. the average wave amplitude of P300 after S2; 3. CNV changes starting point A to the average wave amplitude (the early stage composition of CNV) of B, and B point is time course 750ms place; 4. the average wave amplitude that B point is ordered to C (CNV composition in mid-term), C point is time course 1500ms place; 5. C point is to S2(CNV composition in late period) average wave amplitude.
By SPSS software to above-mentioned latent period or wave amplitude carrying out the variance analysis (MAVONA) of three factors, positive triangle) and recording electrode (3 levels: FZ, FCZ and CZ) factor is respectively: negative pressure state (2 levels: negative pressure and without negative pressure), 1 stimulates classification (S2:, wherein negative pressure state belongs to non-duplicate measurements factor, recording electrode belongs to duplicate measurements factor, P value adopts Greenhouse-Geisser to proofread and correct, and Post hoc multiple ratio adopts Bonferroni to proofread and correct compared with P value.
(1) A average latency duplicate measurements variance analysis
Negative pressure state and not remarkable without main effect under negative pressure state, F (1,15)=0.251, P=0.087 > 0.05, show negative pressure and without two states of negative pressure, the CNV negative potential that S1-S2 normal form is brought out changes the latent period of starting point without dominant outstanding difference.Average latency (M=334.063ms, MSE=6.444ms) without the A bringing out under the average latency (M=329.438ms, MSE=6.487ms) of the A bringing out under negative pressure state and negative pressure state is similar.
In addition, FZ, FCZ and CZ electrode A average latency main effect are remarkable, F (2,30)=0.714, P=0.022 < 0.05.
(2) the average wave amplitude duplicate measurements of A variance analysis
Negative pressure state and not remarkable without main effect under negative pressure state, F (1,15)=0.251, P=0.963 > 0.05, show negative pressure and without two states of negative pressure, the CNV negative potential that S1-S2 normal form is brought out changes the wave amplitude there was no significant difference of starting point.Average wave amplitude (M=﹣ 5.736 μ V, MSE=1.150 μ V) without the A bringing out under the average wave amplitude (M=﹣ 7.176 μ V, MSE=1.194 μ V) of the A bringing out under negative pressure state and negative pressure state is similar.
In addition, the average wave amplitude main effect of FZ, FCZ and CZ electrode A is not remarkable, F (2,30)=0.714, P=1.445 > 0.05.
(3) P300 average latency duplicate measurements variance analysis
Negative pressure state and remarkable without main effect under negative pressure state, F (1,15)=4.760, P=0.045 < 0.05, shows negative pressure and without two states of negative pressure, the P300 that S2 command signal is brought out has significant difference latent period.Without the average latency (M=2132.750ms, MSE=17.460ms) of the P300 bringing out under negative pressure state, than the average latency (M=2164.000ms, MSE=15.739ms) of the P300 bringing out under negative pressure state, want short many.
In addition, FZ, FCZ and CZ electrode P300 average latency main effect are not remarkable, F (2,30)=0.424, P=0.658 > 0.05.
(4) the average wave amplitude duplicate measurements of P300 variance analysis
Negative pressure state and not remarkable without main effect under negative pressure state, F (1,15)=2.242, P=0.155 > 0.05, shows negative pressure and without two states of negative pressure, the wave amplitude there was no significant difference of the P300 that S2 command signal is brought out.Average wave amplitude (M=4.005 μ V, MSE=2.423 μ V) without the P300 bringing out under the average wave amplitude (M=0.602 μ V, MSE=2.491 μ V) of the P300 bringing out under negative pressure state and negative pressure state is similar.
In addition, the average wave amplitude main effect of FZ, FCZ and CZ electrode P300 is not remarkable, F (2,30)=1.017, P=0.374 > 0.05.
(5) the average wave amplitude duplicate measurements of A-B variance analysis
Negative pressure state and not remarkable without main effect under negative pressure state, F (1,15)=2.109, P=0.167 > 0.05, shows negative pressure and without two states of negative pressure, the average wave amplitude there was no significant difference of the early stage composition of CNV that S1-S2 normal form is brought out.Similar without the average wave amplitude of the early stage composition of CNV (M=﹣ 3.761 μ V, MSE=1.129 μ V) bringing out under the average wave amplitude of the early stage composition of the CNV bringing out under negative pressure state (M=﹣ 5.958 μ V, MSE=1.214 μ V) and negative pressure state.
In addition, the average wave amplitude main effect of FZ, FCZ and CZ electrode A-B is not remarkable, F (2,30)=2.822, P=0.075 > 0.05.
(6) the average wave amplitude duplicate measurements of B-C variance analysis
Negative pressure state and not remarkable without main effect under negative pressure state, F (1,15)=3.849, P=0.069 > 0.05, shows negative pressure and without two states of negative pressure, the average wave amplitude there was no significant difference of CNV composition in mid-term that S1-S2 normal form is brought out.Similar without the average wave amplitude of CNV composition in mid-term (M=﹣ 4.315 μ V, MSE=1.325 μ V) bringing out under the average wave amplitude of CNV composition in mid-term bringing out under negative pressure state (M=﹣ 7.562 μ V, MSE=1.271 μ V) and negative pressure state.
In addition, the average wave amplitude main effect of FZ, FCZ and CZ electrode B-C is remarkable, F (2,30)=5.650, P=0.008 < 0.05.
(7) the average wave amplitude duplicate measurements of C-S2 variance analysis
Negative pressure state and remarkable without main effect under negative pressure state, F (1,15)=4.983, P=0.041 < 0.05, shows negative pressure and without two states of negative pressure, the average wave amplitude of CNV composition in late period that S1-S2 normal form is brought out has significant difference.More much higher than the average wave amplitude of CNV composition in late period bringing out under negative pressure state (M=﹣ 4.063 μ V, MSE=1.565 μ V) without the average wave amplitude of CNV composition in late period bringing out under negative pressure state (M=﹣ 8.464 μ V, MSE=1.323 μ V) absolute value.
In addition, the average wave amplitude main effect of FZ, FCZ and CZ electrode C-S2 is remarkable, F (2,30)=7.263, P=0.003 < 0.05.
(1) to the variance analysis data of (7) described average latency and wave amplitude if table 6 is to as shown in table 13.
Table 6 A point information recording in latent period list position: ms
Table 7 A point wave amplitude information recording list position: μ V
Table 8 P300 information recording in latent period list position: ms
Table 9 P300 wave amplitude information recording list position: μ V
Table 10 A-B wave amplitude information recording list position: μ V
Table 11 B-C wave amplitude information recording list position: μ V
Table 12 C-S2 wave amplitude information recording list position: μ V
Table 13 has, without the average wave amplitude of measured value under negative pressure state, average latency and variance
Summing up above the results of analysis of variance draws: average wave amplitude of C-S2 time period and P300 average latency have without negative pressure state main effect; A average latency,, there is FZ, FCZ and CZ electrode main effect in the average wave amplitude of B-C and the average wave amplitude of C-S2.
By above result, we find that the CNV overall average ripple of young women when the adjusting type underwear of the larger pressure of dress and under physical relaxation state exists significant difference.Under negative pressure state, CNV overall average wave-wave width is starkly lower than without the CNV overall average wave-wave width under negative pressure state, and this species diversity was given prominence to and manifested in composition in the late period of CNV.The composition performance in late period of CNV be the expectation to command signal S2, i.e. a keep attention process after anticipating signal S1.Therefore, can illustrate that negative pressure state has affected experimenter's keep attention ability to a certain extent.P300 as S2 after the relevant electric signal index of notice, under negative pressure state, also there is significant difference having or not in its average latency, average latency under negative pressure state will be apparently higher than without negative pressure state, and this explanation adjusting type underwear has affected experimenter's notice to a certain extent.
Experiment conclusion:
(1) young women dress during compared with the adjusting type underwear of strong pressure keep attention ability reduce, and by Psychological Resources excessively expend with the irrelevant stimulation of task on, thereby weakened the expectation to task, cause psychomotor slow.
Numerous scholar's research are found height and the keep attention height correlation of CNV wave amplitudes, and when keep attention strengthens, CNV wave amplitude obviously raises, and keep attention is when decline, and CNV wave amplitude obviously reduces.In addition, part mental disease or Psychologic Problems also can cause experimenter CNV decreased amplitude.The decline of CNV wave amplitude not only points out experimenter's keep attention ability poor, also points out it to the irrelevant stimulation oversaturation of task, to consume Psychological Resources, causes the available Psychological Resources of Cognitive task not enough.Therefore, in this research, under negative pressure state, CNV decreased amplitude can point out pressure that adjusting type underwear is stronger to weaken the keep attention ability of young women.CNV is subject to the time and notices that modulation can be divided into the early stage composition relevant to consciousness and the relevant composition in late period with motion response.Under negative pressure state, CNV composition in late period is low without negative pressure state group, has reflected that expectation behavior and the psychomotor a little less than having under experimenter's negative pressure state is slow.
(2) compared with the adjusting type underwear of strong pressure, disperse the notice of young women, caused its decision making or motion to extend process time.
The height of the wave amplitude of P300 is proportionate with the quantity of neuronal activation or intensity, and in the situation that other factors remains unchanged, its wave amplitude depends on that the height, attentional resources of irritation level are to the sendout stimulating and the complexity of task to a great extent.In some researchs, by increasing the difficulty of task, found that, along with the increase of difficulty, people's mental load increases the weight of thereupon, and the wave amplitude of P300 is with regard to corresponding decline.And find in some simple tasks require the research of (as the goal stimulus of seeing is carried out to button reaction), the validity of prompting can not affect the wave amplitude of P300 after goal stimulus.This is because simple task is lower to the requirement of cognitive Decision, can not process and produce significantly impact cognition.This conclusion is consistent with this experimental result.The latency reaction of P300 be brain to stimulating the time span of evaluation procedure.The increase of task difficulty obviously extends P300 latent period, and this prolongation is significantly stablized.Therefore, P300 has also been subject to as composition in late period in ERPs the debugging that the time notes, can guess that this modulating action may be to betide decision making stage or motion process segment.Under negative pressure state, obviously raise the latent period of P300 than without negative pressure group state group, and the pressure that also can point out adjusting type underwear to bring has thus disperseed experimenter's notice, causes the time lengthening of its decision making or motion processing.
Figure 14 is test result analysis summary figure, by Figure 14, can get information about whole test.Technical scheme of the present invention, has proved that event related potential technology can effectively evaluating garment pressure, and for the evaluation in the eyes of functional pressure garments provides objective appraisal standard, for pressure garments product design from now on, plays and instruct and role of inspection.
Should be appreciated that the above detailed description of technical scheme of the present invention being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art modifies reading the technical scheme that can record each embodiment on the basis of instructions of the present invention, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. the study on pressure comfort of clothing evaluation method based on event related potential technology, is characterized in that: the method comprises
Experimenter is applied respectively and tests stimulation with having under garment pressure state under without garment pressure state, and record corresponding brain wave;
Calculate respectively without under garment pressure state and have lower multiple covariance that records P3a composition in brain wave, P3b composition and CNV composition of garment pressure state;
Multiple covariance by the P3a composition to calculating, P3b composition and CNV composition is analyzed contrast, and study on pressure comfort of clothing is evaluated.
2. according to the garment pressure evaluation method based on event related potential technology described in claim 1, it is characterized in that: with tristimulus Oddball normal form and/or S1-S2 normal form, apply described stimulation.
3. according to the garment pressure evaluation method based on event related potential technology described in claim 1, it is characterized in that: described experimenter's selection standard is BMI >=23, BMI is zaftig level index.
4. according to the garment pressure evaluation method based on event related potential technology described in claim 1, it is characterized in that: described without garment pressure state and have garment pressure state to be selected from the subjective assessment grade of experimenter to garment pressure state.
5. according to the garment pressure evaluation method based on event related potential technology described in claim 4, it is characterized in that: subjective assessment grade is divided into power sense with no pressure, light pressure sense, moderate, feeling of stress is large and very large five kinds of feeling of stress.
6. according to the garment pressure evaluation method based on event related potential technology described in claim 5, it is characterized in that: described in to have the subjective assessment grade that garment pressure state is corresponding be that feeling of stress is larger.
7. according to the garment pressure evaluation method based on event related potential technology described in claim 1, it is characterized in that: described experimenter determines experimental sequence in pseudorandom mode.
8. according to the garment pressure evaluation method based on event related potential technology described in claim 1, it is characterized in that: the method further comprises that determine characterizing experimenter feels the tested subjective experiment that takes the subjective assessment grade of constriction.
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