Motor Program Transformation of Throwing Dart from the Third-Person Perspective.

Alexey Tumialis,Kirill Fadeev,Alexey Smirnov,Alexander Sergievich,Pavel Khoroshikh,Kirill Golokhvast,Tatiana Alikovskaia

doi:10.3390/brainsci10010055

Alexey Tumialis, Kirill Fadeev + Show 5 more

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https://doi.org/10.3390/brainsci10010055

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Journal: Brain sciences	Publication Date: Jan 18, 2020
Citations: 8	License type: CC BY 4.0

Affiliation: Far Eastern Federal University

Abstract

The perspective of perceiving one’s action affects its speed and accuracy. In the present study, we investigated the change in accuracy and kinematics when subjects throw darts from the first-person perspective and the third-person perspective with varying angles of view. To model the third-person perspective, subjects were looking at themselves as well as the scene through the virtual reality head-mounted display (VR HMD). The scene was supplied by a video feed from the camera located to the up and 0, 20 and 40 degrees to the right behind the subjects. The 28 subjects wore a motion capture suit to register their right hand displacement, velocity and acceleration, as well as torso rotation during the dart throws. The results indicated that mean accuracy shifted in opposite direction with the changes of camera location in vertical axis and in congruent direction in horizontal axis. Kinematic data revealed a smaller angle of torso rotation to the left in all third-person perspective conditions before and during the throw. The amplitude, speed and acceleration in third-person condition were lower compared to the first-person view condition, before the peak velocity of the hand in the direction toward the target and after the peak velocity in lowering the hand. Moreover, the hand movement angle was smaller in the third-person perspective conditions with 20 and 40 angle of view, compared with the first-person perspective condition just preceding the time of peak velocity, and the difference between conditions predicted the changes in mean accuracy of the throws. Thus, the results of this study revealed that subject’s localization contributed to the transformation of the motor program.

Highlights

Throughout life, subjects develop a perception of their actions from the first-person point of view.At the same time, in some situations, the subject is given the task of regulating his own actions when he perceives himself from an outside perspective, for example, in a mirror during rehearsals and trainings, while controlling an avatar in computer games using virtual reality (VR) and motion capture, or controlling a remote robot that repeats the operator’s actions.In the first-person perspective the person looks from the position of localizing himself within the borders of his own body
In some situations, the subject is given the task of regulating his own actions when he perceives himself from an outside perspective, for example, in a mirror during rehearsals and trainings, while controlling an avatar in computer games using virtual reality (VR) and motion capture, or controlling a remote robot that repeats the operator’s actions
The present study revealed the changes in accuracy and hand kinematic while the subjects performed dart throws perceiving themselves from 1PP and from the 3PP with various degrees of perception

Summary

Introduction

Throughout life, subjects develop a perception of their actions from the first-person point of view.At the same time, in some situations, the subject is given the task of regulating his own actions when he perceives himself from an outside perspective, for example, in a mirror during rehearsals and trainings, while controlling an avatar in computer games using virtual reality (VR) and motion capture, or controlling a remote robot that repeats the operator’s actions.In the first-person perspective the person looks from the position of localizing himself within the borders of his own body. The first-person perspective (1PP) facilitates the transfer of information between visual and motor systems due to direct coincidence in measurement between the body image and the corresponding representation of an action The result of this coincidence is expressed in faster and more accurate subject’s reactions [1]. Changing the perspective has negative effects on memory [2,3] and the intensity of emotional reactions decrease [4], the initiation and execution of an action slow down, its accuracy decreases [5,6] These changes are associated with a change in the localization of a subject and, as a result, cause several mismatches in the regulation of the execution of an action. The priority of perception from the first-person perspective at this level was not found [10] suggesting that the lability of perception of perspective is necessary for social orientation

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