A method and system for testing the life perception of an adult individual

Abstract

The application discloses a kind of adult individual life perception test method and system thereof, adopt to increase mask point and produce a variety of difficulty, visual angle, size and various time length of light point movement test material;Subject is quietly seated in front of screen, free fixation with right side and upside-down two modes present on screen light point movement;According to the judgment accuracy of the right side of the light point small person movement of subject, assess the life perception ability of individual.System includes computer and the light point movement material library stored in the computer, call module, material making module, test control module and evaluation module.The application presents right side and upside-down to subject on screen alternately or simultaneously, according to the judgment accuracy of right side light point small person movement, assesses life perception ability, can set different difficulty level, or gradually increase light point movement difficulty level to subject test, more accurately control individual test difficulty, achieve accurate test of life perception ability.

Description

Technical Field

[0001] This invention belongs to the field of testing technology for human life perception ability, specifically relating to a method and system for testing life perception in adult individuals. Background Technology

[0002] Humans exhibit an extraordinary and powerful visual sensitivity to the movement of other humans and other organisms, consistently and accurately identifying biological motion even in point-light displays. This ability to detect biological motion helps us prioritize the detection of other living beings; we can even discern gender, personality traits, and intentions from human point-light movements, all of which benefit our survival and development. Johansson and Psychophysics (1973) pioneered the point-light display paradigm for the study of biological motion. The biological basis of this visual cue is semi-rigid motion. Since the inception of the PLD paradigm, many researchers have utilized it to better understand the mechanisms of biological motion perception, improve motor performance, promote motor rehabilitation, and even apply it to film and video games.

[0003] Biological movement is one of the clues to the perception of life. Current research on life perception is limited by the low difficulty of light spot motion materials, which only show the single movement of light spots and is relatively simple. It is limited to the measurement of life perception in infants and children and is not applicable to adult individuals. Summary of the Invention

[0004] To address the problem that existing vital perception measurements are not suitable for testing the vital perception of adults, this invention provides a method and system for testing the vital perception of adults, achieving the goal of creating a system suitable for measuring the vital perception of adults.

[0005] The specific solution is as follows:

[0006] On one hand, the present invention provides a method for testing adult life perception, the method comprising the following steps:

[0007] Step 1: Create light spot motion test materials with various difficulties, viewing angles, sizes, and durations by adding masking light spots;

[0008] Step 2: The subject sits quietly in front of the screen and freely observes the movement of light spots presented on the screen in both upright and inverted modes;

[0009] Step 3: Assess the individual's life perception ability based on the subject's accuracy in judging the movement of the upright light dot figure.

[0010] Further, in step 2, the motion videos of two paired light point men are simultaneously played on the left and right of a single screen or double screens in perspective projection, and the subject freely watches the motion of the light points on both sides and judges the position of the upright light point man motion through the left and right buttons.

[0011] Or further, the motion videos of two paired light point men are simultaneously played on the left and right of a single screen or double screens in perspective projection, and the subject automatically tracks the gaze preference and arousal degree of the subject to the upright light point motion by wearing an eye tracking device.

[0012] Further, in step 2, after the subject completes the judgment of the played two paired light point man motion videos, a nine-square probe is presented on the position where the light point man motion is presented, and the probe where the upright light point man motion is judged to be located is selected through the digital button; in step 3, the life perception ability of the individual is evaluated according to the recognition accuracy of the probe.

[0013] Preferably, the two paired light point man motion videos have the same action type, the same masking mode and the same number of masks, and are respectively the upright light point motion and the inverted light point motion randomly presented on the left and right.

[0014] The specific light point motion test material production method in step 1 is:

[0015] Step 1.1, obtaining light point man original materials;

[0016] Step 1.2, selecting a variety of representative biological motions of light point men from the original materials;

[0017] Step 1.3, setting upright light point men and inverted light point men through mirror conversion, and adding masking light points to the biological motion of light point men, and adjusting the number of masking light points;

[0018] Step 1.4, pairing the upright light point men with the inverted light point men with the same masking light points, and randomly presenting them on the left and right test screens, and pseudo-randomly presenting all paired videos in each test.

[0019] Preferably, in step 1.3, two masking light point modes of random masking and permutation masking are adopted to increase masking light points in the biological motion of the selected multiple light point men, forming multiple difficulty levels of light point man biological motion.

[0020] Further preferably, in step 1.3, two masking light point modes of static masking and linear masking are adopted to increase masking light points in the biological motion of the selected multiple light point men, forming multiple difficulty levels of light point man biological motion.

[0021] On the other hand, the present invention also provides an adult life perception testing system, the system comprising a computer and a light spot motion material library, a retrieval module, a material production module, a test control module, and an evaluation module stored in the computer; the light spot motion material library stores various original light spot figures; the retrieval module is used to retrieve light spot figures from the light spot motion material library and transmit them to the material production module; the material production module uses an enhanced masking method to produce light spot motion test materials of various difficulties, perspectives, sizes, and durations; the test control module is used to retrieve the light spot motion test materials produced in the material production module according to the set difficulty level, and present them on the computer display screen in both upright and inverted modes, for the subject to judge the movement of the upright light spot figure; the evaluation module evaluates the individual's life perception ability based on the subject's accuracy in judging the movement of the upright light spot figure.

[0022] Furthermore, the material production module includes an orientation conversion module, a masking enhancement module, a video generation module, and an export module;

[0023] The orientation conversion module is used to convert the light dot figure from an upright position to an inverted mirror image.

[0024] The masking enhancement module is used to enhance the extracted light spot mannequin raw material using at least one of random masking, scrambling masking, static masking, and linear masking.

[0025] The video generation module is used to adjust the projection mode, viewing angle, and size of the light spot;

[0026] The export module generates a motion video of light spots in MOV format by setting the corresponding resolution.

[0027] More preferably, the system also includes an eye-tracking device connected to a computer for collecting the subject's eye movement information and automatically tracking the subject's fixation preference for the movement of an upright light spot.

[0028] Furthermore, the computer also includes a probe detection module and a numeric keypad. The probe detection module is used to display the gray square positions in a 3x3 grid on the computer's display screen, and the 3x3 grid and the video of the moving light dot figure appear alternately on the computer's display screen. The display position in the 3x3 grid is selected by the numeric keypad. The evaluation module assesses the subject's gaze preference for biological motion based on the proportion of the number of correct probe identifications on the upright light dot figure side out of all correct identifications.

[0029] The technical solution of the present invention has the following advantages:

[0030] A.The present application produces a light point movement test material suitable for different age groups and various difficulty levels by increasing the masking light point method, uses upright and inverted to present on the screen to the subject alternately or simultaneously, evaluates the life perception ability of the subject according to the correct rate of the subject to the upright light point man movement judgment, and can set different difficulty levels for the subject or gradually increase the light point movement difficulty level to test the subject, so as to more accurately control the individual test difficulty and accurately measure the life perception ability of the subject.

[0031] B.The test method and system provided by the present application are suitable for a wide range of people, and the test age of life perception is expanded from infants to adults; from disease groups (such as autism) to the general population, so it not only helps to promote the research of the social cognitive mechanism of the general population, but also helps to diagnose and evaluate the social function damage related to mental illness.

[0032] C.The present application has low task operation difficulty, can combine various response methods, including eye tracking (gaze position, gaze time), skin electricity and electrocardiogram physiological indexes, and can be tested without oral report and clear language expression ability, and can produce a norm based on the test results of the general population, so that the life perception ability of different ages and special groups can be more effectively detected. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the present application, the drawings needed in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0034] Figure 1 is a flow chart of the adult life perception test method provided by the present application;

[0035] Figure 2 is Figure 1 material production flow chart;

[0036] Figure 3 is the view of the upright light point man and the inverted light point man presented on the display screen;

[0037] Figure 4 is the nine-square probe view presented on the display screen;

[0038] Figure 5 is a composition structure diagram of the adult life perception test system provided by the present application;

[0039] Figure 6 is Figure 5 material production module composition structure schematic diagram in Detailed Implementation

[0040] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figure 1 and Figure 2 As shown, the present invention provides a method for testing the life perception of adult individuals, comprising the following steps:

[0042]

S01

[0043] The specific process for testing materials for light spot motion:

[0044] (1) Obtaining original materials: You can log in to this webpage (https: / / plavimop.prd.fr / en / motions) as the original materials.

[0045] (2) Selection of raw materials: This invention selected 20 biological movements of the light dot figures, all stimulated by the PLAViMoP Database (a free and open-source database) (https: / / plavimop.prd.fr / en / motions). All movements selected in this invention are full-body human movements, regardless of gender, and belong to the categories of daily life. Each movement consists of 19 signal points connected to a humanoid joint (including the head, two shoulders, two elbows, two wrists, two hands, two hips, two knees, two ankles, two heels, and two toes), and the movement types include walking, running, jumping, and other daily movements.

[0046] (3) Production of biological motion materials:

[0047] Load the downloaded raw material in the PLAViMoP2 control panel; then adjust the orientation, add masking light spots, and adjust the viewpoint and light spot range. Of course, other methods can also be used, such as generating light spots and adding masking using programming code.

[0048] The specific steps are as follows:

[0049] ① Orientation Conversion: In the Space Conversion section of the computer control panel, check the Z-axis, Y-axis, and X-axis for mirror conversion to complete the conversion from upright to inverted.

[0050] ②Increase the mask: there are four ways to increase the mask points, including random masking, scrambling masking, static masking and linear masking.

[0051] Random masking is a set of randomly defined trajectories of light points, the initial position and instantaneous acceleration are randomly selected, and the masking points move along the three axes;

[0052] Scrambled masking is a set of points with the same trajectory as the initial light points, except that their starting positions are randomly defined, and the control loop ensures that they appear within the bounding box.

[0053] The number of scrambled masks (k) is proportional to the number of point lights (n) in the initial set. The way to adjust the difficulty is to adjust the size of random (the number determines the number of masks) and scrambled (the number determines the multiple of masks, such as the number of light points in the material is 19 markers, if you choose two times of scrambled mask, it will add 38 masks) in the control panel. A total of 6 difficulties are set. About the difficulty division: the fewer the number of masks, the lower the difficulty, and the mask light point is 0 for the lowest difficulty, only showing the action; increase 20 masking stimuli in random form and 1 times masking stimuli in scrambled form (that is, 19, close to the number of random masks); then increase 40, 60, 80, 100 and 2 times, 3 times, 4 times, 5 times respectively.

[0054] Static masking is a light point that does not move, and its coordinates (randomly defined) are within the bounding box, and up to 200 static masks can be added;

[0055] Linear masking is a moving point light with constant speed, and linear masking only moves along the x-axis (positive or negative direction), and their initial positions are randomly selected.

[0056] The last two masking modes can be selected according to the needs of the production material. Note: when increasing the number of masking points, each change needs to reload the action once, otherwise the range of masking points will increase on the original basis and become larger and larger.

[0057] ③Selection of projection mode: all light points in this invention are perspective projection (a kind of single plane projection map that is close to visual effect, which is obtained by using central projection method to project the shape onto the projection plane. It has a series of perspective characteristics such as disappearance, distance, and regular changes of the same size of shape, and can reflect the spatial image of the shape realistically).

[0058] Operation: Set the projection mode under Camera settings under the Camera in the video generation module.

[0059] ④ Adjust the viewing angle: This invention selects the right side. Operation: In the video generation module, under Camera, set View to right in Camerasettings.

[0060] ⑤ Adjust the size of the light spot: In the Camera settings under the Video Generation module, the parameters include azimuth, altitude (which determines whether it's an upward or downward view), and zoom. This invention selects an azimuth of 90 degrees, an altitude of 0, parallel to the horizontal plane, and centered on the screen; the zoom is set to 7.

[0061] ⑥ After adjusting the above parameters, click the video generation module, select the corresponding resolution, and then export to obtain a motion video of light spots in MOV format.

[0062] (4) Adjustment of video format: The original video format is mov. In order to facilitate use in conventional players and to maximize applicability in subsequent experimental procedures, this invention converts the video format to mp4, cuts off the black background around the edges, and adjusts the position of the light spot to the center to highlight the movement of the light spot.

[0063] (5) Adjusting video playback duration: Adjust to loop playback, the number of times can be customized. All files are named in the format of action plus masking type (scr or rand) plus masking level.

[0064]

S02

[0065] (1) A laptop computer with PsychoPy software installed (other software that can present picture or video stimuli and collect the subject’s response is also acceptable; this invention uses PsychpPy3 software).

[0066] (2) If physiological indicators that do not require subjective reporting by the subject are used (such as electroencephalogram, skin conductance, pupillary activity, etc.), the testing computer needs to be connected to the corresponding equipment.

[0067] This testing procedure includes a practice phase and a formal measurement phase. The practice phase consists of 10 trials, and only those achieving an accuracy rate of 80% or higher can proceed to the formal measurement phase. This ensures that the test taker is familiar with and understands the operating instructions and measurement software. The 10 practice trials are randomly selected from the formal trials.

[0068] Instructions: "Welcome to participate in our experiment, the next two light points will appear on the computer motion video, please watch freely, after the video is played, there will be a nine-grid on both sides of the screen, one of the nine-grid will be a gray square different from other squares, please report the position of the gray square in the nine-grid you are looking at, please use the numeric keypad to report the position of the gray square. There is no right or wrong answer, please report it honestly."

[0069] Measurement process:

[0070] (1) Subject preparation: The subject's emotional state is calm, with normal binocular or corrected vision, no color blindness or color weakness. Myopes need to wear glasses to participate in the test, and ensure adequate rest before the experiment, without cold, headache and other physical discomfort. Connect the eye movement device, the eye movement device used in this invention is Tobii Pro Lab.

[0071] (2) Eye movement correction: In order to ensure good eye movement data, a calibration process should be performed before starting the test. The goal is to achieve an average distance between the subject's gaze direction and the target point of less than 0.5° visual angle.

[0072] (3) The formal measurement stage includes 220 trials, in each trial, a ten-character symbol appears first for 1000ms, then two paired light point motion videos appear on both sides of the computer screen, both have the same action type, the same masking mode, and the same number of masks, only the upright and inverted distinction, a total of 440 video materials (2 masking modes, 5 difficulty levels for each masking, and 20 baseline actions without masking). Since the duration of each action is different, the duration is between 5 seconds and 12 seconds, so the presentation time needs to be set as a variable. The video is 930 pixels high and 780 pixels wide, located at (-500, 0) and (500, 0) in pixels (pix), as shown in Figure 3 .

[0073] (4) After the two videos are played, a pair of small visual probe stimuli will appear at the location of the video, with a duration of 200 milliseconds. The probe picture background is black, and the probe picture size is 930 pixels (width) x 780 pixels (height), and the picture format is jpg. The probe is a 3x3 grid, one of the outer 8 grid positions is occupied by a small gray square, as shown in Figure 4 .

[0074] (5) Pseudo-randomly encode all videos and probes. In each trial, the position of the biological motion (upright) and non-biological motion stimulus (inverted) is completely random, so they have the same probability of appearing on the left and right sides, and after each biological motion, a nine-grid probe appears according to the playback position, so does the probe.

[0075] (6) The total duration of the whole measurement process is 50-60 minutes. After the measurement, a csv table containing the data of reaction time, key reaction and accuracy rate, etc. will be generated for each subject by the probe detection. According to the table generated by the experiment, the data is analyzed to obtain the measurement results. The proportion of the number of correct recognition of the biological movement side (upright light point movement) to the total number of correct recognition is calculated to measure the gaze preference and life perception ability of the biological movement.

[0076] Of course, the eye movement indicators collected by the eye movement device can also be calculated and analyzed as the basis for evaluating the life perception ability of adult individuals.

[0077] The calculation of the eye movement indicators is as follows:

[0078] Total effective time (%): the percentage of the time that the participant stares at the screen;

[0079] Biological movement preference (%): the ratio of the total time spent by the participant in observing biological movement to the total time spent by him / her in observing biological and non-biological movement at the same time;

[0080] Percentage of time of first fixation on biological movement (%): the percentage of the time of first fixation on biological movement by the participant to the total fixation time.

[0081] Average latency of first fixation on biological (non-biological) movement: the average (across all videos) time from the start of the stimulus to the first fixation by the participant on the defined biological (non-biological) movement in the area of interest.

[0082] In summary, the recorded result parameters in the present application can finely measure the life perception ability or sensitivity of the general population.

[0083]

S03

[0084] The subject makes a specific evaluation of the biological movement preference value measured by the test method provided by the present application.

[0085] The general population has a gaze preference for upright biological movement, such as a preference for the upright side in more than 70% of the trials. The gaze preference for upright and inverted may not be significantly different in the autism population. Therefore, the life perception ability of the general population and the population with certain mental disorders can be quickly distinguished by the test method of the present application.

[0086] For example, Figure 5As shown, the present application also provides an adult life perception test system, which comprises a computer and a light point movement material library, a calling module, a material making module, a test control module and an evaluation module stored in the computer; the light point movement material library stores a plurality of light point man original materials; the calling module is used to call the light point man in the light point movement material library and transmit it to the material making module; the material making module uses the increasing masking method to make a plurality of light point movement test materials with different difficulty levels, viewing angles, sizes and time lengths; the test control module is used to extract the light point movement test materials made by the material making module according to the set difficulty level and present them on the display screen of the computer in two modes of upright and upside down, which can be arranged on the left and right sides or on the top and bottom, so that the subject can make a judgment on the movement of the upright light point man; and the evaluation module evaluates the individual's life perception ability according to the correct rate of the subject's judgment on the movement of the upright light point man.

[0087] As shown, Figure 6 The material making module is provided with a direction conversion module, a masking increasing module, a video generating module and an exporting module;

[0088] The direction conversion module is used to convert the light point man from upright to upside down mirror image;

[0089] The masking increasing module is used to increase the light points of the extracted light point man original material in at least one of the following ways: random masking, disorder masking, static masking and linear masking, so as to cause visual stimulation or interference to the subject;

[0090] The video generating module is used to adjust the projection mode, viewing angle and light point size of the light points;

[0091] The exporting module obtains the light point movement video in mov format by setting the corresponding resolution and presents it to the subject.

[0092] The system is also provided with an eye movement device connected with the computer, which is used to collect the eye movement information of the subject and automatically track the fixation preference of the subject on the upright light point movement.

[0093] The computer is also embedded with a probe detection module and a digital keyboard; the probe detection module is used to present the gray square position in the nine-square grid on the display screen of the computer, and the nine-square grid and the light point man movement video appear alternately on the display screen of the computer; the digital keyboard is used to select the presentation position of the gray square in the nine-square grid; and the evaluation module evaluates the fixation preference of the subject on the biological movement according to the proportion of the number of correct probe recognition on the upright light point man side to the total number of correct recognition.

[0094] The present application is not limited to the above-mentioned material manufacturing method, and provides a new paradigm suitable for measuring the life perception of adult individuals. The life perception difficulty is improved by increasing the motion masking stimulus of the light spot. Any paradigm using such a form of light spot motion material (such as increasing masking, changing orientation, and other means to improve biological motion perception difficulty) to measure the life perception ability, characteristics, and mechanism of adult individuals belongs to the protection scope.

[0095] Obviously, the above embodiments are only examples for the purpose of clarity, and are not limitations on the embodiments. Based on the above description, other different forms of changes or variations can also be made by those of ordinary skill in the art. It is not necessary and impossible to exhaust all embodiments here. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A life perception test system for adult individuals, characterized by, The system includes a computer and a light spot motion material library, a retrieval module, a material production module, a test control module, and an evaluation module stored in the computer. The light spot motion material library stores various original light spot figure materials. The retrieval module retrieves light spot figures from the library and transmits them to the material production module. The material production module uses masking techniques to create light spot motion test materials with varying difficulty, viewing angles, sizes, and durations. The test control module retrieves the prepared light spot motion test materials from the material production module according to a set difficulty level and presents them on the computer screen in both upright and inverted modes for the subject to judge the movement of the upright light spot figure. The evaluation module assesses an individual's life perception ability based on the subject's accuracy in judging the movement of the upright light spot figure. The material production module includes an orientation conversion module, a masking enhancement module, a video generation module, and an export module. The orientation conversion module is used to convert the light dot figure from an upright position to an inverted mirror image. The masking enhancement module is used to enhance the extracted light spot mannequin raw material using at least one of random masking, scrambling masking, static masking, and linear masking. The video generation module is used to adjust the projection mode, viewing angle, and size of the light spot; The export module obtains a motion video of light spots in MOV format by setting the corresponding resolution. The computer also includes a probe detection module and a numeric keypad. The probe detection module displays the positions of gray squares in a 3x3 grid on the computer's screen, with the 3x3 grid and the video of the moving dotted figure appearing alternately on the screen. The numeric keypad is used to select the position of the gray square in the 3x3 grid. The evaluation module assesses the subject's gaze preference for biological motion based on the proportion of correctly identified probes on the upright side of the dotted figure out of all correct identifications.

2. The adult individual sense of life test system according to claim 1, characterized in that, The system also includes an eye-tracking device connected to a computer, used to collect eye movement information from the subject and automatically track the subject's fixation preference for the movement of an upright light spot.

3. The adult individual life perception test system of claim 1, wherein The adult individual life perception testing system also includes a method for testing adult individual life perception, the method comprising the following steps: Step 1 involves creating light spot motion test materials with varying difficulties, viewing angles, sizes, and durations by adding masking light spots. The specific manufacturing method is as follows: Step 1.1: Obtain the original materials for the light dot figure; Step 1.2: Select representative biological movements of various light-spot figures from the original materials; Step 1.3: Set up upright and inverted light spot figures through mirror transformation, and add masking light spots during the biological movement of the light spot figures, adjusting the number of masking light spots; Step 1.4: Pair up upright light spot figures and inverted light spot figures with the same masking light spot and randomly display them on the left and right test screens. Pseudo-randomly display all paired videos in each trial. Step 2, the subject sits quietly in front of the screen, free to gaze at the light point movement presented on the screen in two modes of upright and inverted; Step 3, according to the judgment accuracy of the subject to the upright light point man movement side, the individual's life perception ability is evaluated.

4. The adult individual sense of life test system according to claim 3, characterized in that, In step 2, two paired light point man movement videos are played simultaneously on a single screen or double screens in perspective projection mode, and the subject freely watches the light point movement on both sides and judges the position of the upright light point man movement through left and right buttons.

5. The adult individual sense of life test system according to claim 3, characterized by In step 2, two paired light point man movement videos are played simultaneously on a single screen or double screens in perspective projection mode, and the subject automatically tracks the gaze preference and arousal degree of the subject to the upright light point movement by wearing eye movement equipment.

6. The adult individual sense of life test system according to claim 3, characterized by In step 2, after the subject completes the judgment of the two paired light point man movement videos, a nine-square probe is presented on the position of the light point man movement, and the subject selects the probe judged as the position of the upright light point man movement through digital buttons; in step 3, the individual's life perception ability is evaluated according to the recognition accuracy of the probe.

7. The adult individual sense of life test system according to claim 5 or 6, characterized in that The two paired light point man movement videos have the same action type, the same masking mode and the same number of masks, which are random left and right presentation of upright light point movement and inverted light point movement.

8. The adult individual sense of life test system according to claim 7, characterized by In step 1.3, two masking light point modes, random masking and scrambling masking, are used to increase the masking light points in the biological movement of the selected multiple light point men, forming multiple difficulty levels of light point man biological movement.

9. The adult individual sense of life test system according to claim 8, characterized in that, In step 1.3, two masking light point modes, static masking and linear masking, are used to increase the masking light points in the biological movement of the selected multiple light point men, forming multiple difficulty levels of light point man biological movement.

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