JP2004317784A - Method and device for presenting image - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To induce a reflex movement of a user without being restricted by a mechanical stimulation presenting device. <P>SOLUTION: An subject 2 grips a finger movement measuring instrument 11 and puts it below an image presenting part 13. A certain image (still image) is presented to the subject 2 by the image presenting part 13. The subject 2 gazes at a target point Pe and starts a reaching movement from a start point Ps to the target point Pe. When the finger movement measuring instrument 11 detects that fingers have reaches a specific position being on the way of the movement, a presented image generation module suddenly moves the image shown in the image presenting part 13, in one of directions D1 to D8 at a certain speed. Then, the reflex change of muscle activity appears in the arm movement of the subject 2. The subject 2 perceives a virtual external force upon a limb, which agrees with the moving direction of the image. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is an amusement park, an amusement park, a game machine, and the like, a virtual space sensation device using a body movement sensation, a device that transmits one movement sensation and presents it to the other at a remote place, further, a medical diagnosis device, The present invention relates to an image presentation device that can be used for a training device for sports, rehabilitation, and the like.
[0002]
[Prior art]
Heretofore, there have been many devices that induce trunk movement by visual stimulation (for example, Non-Patent Document 1).
[0003]
Conventionally, in a technology for realizing a virtual world with a sense of reality in a computer, which is called virtual reality (virtual reality), when a physical kinetic sensation is induced or an external force to a limb is perceived. In general, a method realized by appropriately combining a visual stimulus and a mechanical stimulus (Patent Documents 2 and 2).
[0004]
[Non-patent document 1]
Lestienne, Exp. Brain res. 28.363-384 (1977), Nashner, Brain Res, 150 (1978) 403-407.
[Patent Document 1]
JP 2000-250395 A [Patent Document 2]
JP 2000-338858 A
[Problems to be solved by the invention]
In such a case, even if it is limited to the case where the user perceives an external force to the limb, the configuration becomes complicated due to the combination with the mechanical device, and the sense of realization of the induced body movement sensation is reduced by the mechanical stimulus presentation. It was very limited by the equipment.
[0006]
SUMMARY OF THE INVENTION It is an object of the present invention to provide an image presentation method and apparatus for inducing a reflex movement to a user without using mechanical stimulation.
[0007]
[Means for Solving the Problems]
The present invention presents an image to a user, and suddenly moves the image being presented to the user in a specific direction during a limb movement of the user within a range that induces a reflex movement of the limb. As a result, a reflex is induced on the limb of the user only by presenting a moving image without using mechanical stimulation.
[0008]
According to the embodiment of the present invention, the image is presented to the user in a wide field of view, and the external force is applied to the user's limb during the limb movement of the user. Move suddenly within the perceived range. As a result, the user's limb is perceived as a virtual external force that matches the motion direction of the image.
[0009]
Means for confirming that the user's limb is exercising is not particularly limited, but it is essential to suddenly move the presented image during the limb exercise of the user.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 is a configuration diagram of an image presentation device according to an embodiment of the present invention. The image presentation device 1 includes a limb movement detection unit 11, a presentation image generation module 12, and an image presentation unit 13.
[0012]
The limb movement detecting section 11 is means for detecting that the user 2 is exercising. Specifically, in addition to the means for measuring the movement of the limb (in this example, the arm), the buzzer or the like is used to adjust the limb movement start time of the user 2. The presentation image generation module 12 presents an image (still image) to the user 2, confirms that the limb of the user 2 is exercising by the limb movement detection unit 11, and then displays the image in the specific direction of the presented image. Generates sudden movements. The generated image becomes an input of the visual sense 3 of the user 2 by the image presenting unit 13 as a display, and induces a change in movement of the limb 4 reflexively.
[0013]
Next, the operation of this embodiment will be described with reference to FIGS.
[0014]
The subject (user) 2 holds the hand movement measuring device, which is the limb movement detecting unit 11, and holds it under the image presenting unit 13 covering the entire visual field of the subject 2. Presenting a constant image (still image) by the image presenting unit 13 to the subject 2 at time _{t 1} (step 21). Subject 2 is gazing at the target point Pe, to start reaching movement from the start point Ps to the target point Pe to time t _2. When the hand movement measuring device 11 detects that the hand reaches the specific position in the middle of the exercise (Step 22), the presented image generation module 12 detects the image shown in the image presenting unit 13 covering the entire field of view. _In FIG. ₃ , the robot is suddenly moved at a constant speed in one of the directions D1 to D8 shown in FIG. 5 (step 23). Here, the image to be presented is a random dot pattern. Then, changes in the reflexive muscle activity in the arm movement of the subject 2 appears in the time t _4. Then, the subject 2 at time t ₅ perceives a virtual external force to the limb that is consistent with the direction of movement of the image. Time t ₆ two-limb motion is completed.
[0015]
FIG. 6A is a graph obtained by trial averaging the amount of muscle activity of the shoulder flexor muscle of the subject from the start of exercise of the presented video, measured by the apparatus of the present embodiment (FIG. 1), for each movement direction of the visual stimulus. . That is, when such a trial is performed ten times in each of the eight directions D1 to D8 of the visual stimulation motion, the time change of the muscle activity recorded from the shoulder flexor muscle of the healthy subject (rectification of the surface electromyogram, (Trial averaged signal for each visual stimulus direction). The time point at which the exercise of the image started was set to time 0. The solid line indicates the amount of muscle activity when no visual stimulus is given, and the broken line indicates the amount of muscle activity for each visual stimulus movement direction. The amount of muscle activity referred to here is obtained by applying a low-frequency elimination filter (cutoff. 30 Hz) to the measured electromyogram signal to remove the influence of exercise and the like, and then performing full-wave rectification, and further 30 [ms]. Refers to the moving average.
[0016]
In the case of a healthy person, in the section indicated by 5 in FIG. 6 (A), the amount of reflex muscle activity with respect to the movement of the image input from the sight with a very short latency of about 100 [ms] from the start of the movement of the presented image Changes appear.
[0017]
FIG. 6B shows the average amount of muscle activity from time 100 to 200 [ms] for each visual stimulus movement direction, obtained from the amount of muscle activity shown in FIG. 6A. The broken line 6 represents the average amount of muscle activity when no visual stimulus is given. From this figure, it can be seen that the reflexive muscle activity observed in the section 5 in FIG. 6A changes according to the direction of movement of the visual stimulus. Due to this change in the amount of muscle activity, a change appears in the arm movement in about 100 [ms] thereafter.
[0018]
FIG. 7 shows the amount of change in the hand acceleration due to the visual stimulus. The difference between the hand acceleration in each of the motion directions D1 to D8 of the visual stimulus and the hand acceleration when the visual stimulus is not applied is calculated. The average value during [ms] is obtained. As shown in FIG. 7, the hand acceleration changes in substantially the same direction as the movement direction of the visual stimulus.
[0019]
In this reaction, in the process where the presented visual motion stimulus is processed in the brain, coordinate transformation is performed to move the arm muscles so that the arm moves in the same direction as the visual stimulation motion direction, As a result, the hand has moved in the same direction as the stimulus, and by using this device, it is possible to configure a device for measuring the function of the brain part related to the reflex.
[0020]
At this time, the subject 2 perceives that a virtual external force has been applied to the hand in substantially the same direction as the change direction of the hand acceleration, that is, in the substantially same direction as the motion direction of the presentation image. However, the causal relationship with the aforementioned reactions is not clear.
[0021]
Although specific data has not been acquired at this stage, the types of presentation images that can induce reflex movements of the limbs and the types of the movements, the types of presentation images that can perceive the virtual external force on the limbs and the types thereof We know empirically that there are exercise types.
[0022]
From the above results, the present device enables a human to exercise without giving any mechanical stimulus from the outside, and allows the user to perceive a virtual external force.
[0023]
【The invention's effect】
According to the first and third aspects of the present invention, it is possible to induce a reflexive limb movement only by presenting a moving image without using mechanical stimulation.
[0024]
According to the second and fourth aspects of the present invention, the virtual external force on the limb can be perceived by suddenly moving an image given to the user's vision when presenting the virtual external force on the limb of the user. Since it is possible, a mechanical mechanical stimulating device is not required, and the device can be configured with a simple device.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an image presentation device according to an embodiment of the present invention.
FIG. 2 is a diagram showing a configuration of a system for measuring a muscle activity amount of a subject using the image presentation device of FIG. 1;
FIG. 3 is a diagram showing a time relationship between a limb movement and a presentation image.
FIG. 4 is a flowchart illustrating an operation of the image presentation device of FIG. 1;
FIG. 5 is a diagram illustrating a motion direction of a visual stimulus to be presented to a subject.
6 is a graph (FIG. 6 (A)) obtained by trial-averaging the amount of muscle activity of the shoulder flexor muscle of the subject for each visual stimulus movement direction from the start of exercise of the presented video, measured by the system of FIG. 6A is a graph showing the average amount of muscle activity from time 100 to 200 [ms] for each visual stimulus movement direction obtained from the amount of muscle activity shown in FIG.
FIG. 7 is a graph showing the average value of the amount of change in hand acceleration from 200 to 250 [ms] from the start of exercise of the presentation video, measured by the system of FIG. 2;
[Explanation of symbols]
Reference Signs List 1 image presentation device 2 subject 3 sight 4 limb 11 limb movement detection unit 12 presentation image generation module 13 image presentation unit 21 to 23 step Ps start point Pe target points D1 to D8 direction of movement of visual stimulus

Claims (4)

An image presentation method in which an image is presented to a user and the image presented to the user is suddenly moved in a specific direction within a range that induces a reflex movement of the limb during the limb movement of the user. The image is presented to the user in a wide field of view, and during the limb movement of the user, the image presented to the user is moved in a specific direction within a range in which external force is perceived on the limb of the user. The image presentation method according to claim 1, wherein the image is suddenly moved. Limb movement detecting means for detecting that the limb of the user is exercising,
Image presenting means for presenting an image to a user;
When the image is generated and the limb movement detecting means detects that the user's limb is exercising, the sudden movement in the specific direction of the image presented by the image presenting means is reflected by the limb reflection. An image presentation device having a presentation image generation module for generating a range in which exercise is induced. When the limb movement detecting unit detects that the limb of the user is exercising, the presented image generating module specifies an image that is presented to the user over a wide field of view by the image presenting unit. The image presentation device according to claim 3, wherein the sudden movement in the direction is generated in a range in which an external force is viewed on the limb of the user.

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