The feeling that "it is the person who causes this act" is called "exercise subjectivity".A sense of exercise subjectivity, which can be said to be an awareness that oneself is realizing one's own exercise, is indispensable for advancing rehabilitation.
Until now, it has been thought that the sense of motor subjectivity is brought about by the agreement between the prediction of "what kind of sensation is caused by this action" and the actual sensory result.However, this time, Professor Shu Morioka and Associate Professor Tomohiro Osumi of the Neurorehabilitation Research Center of Kio University and others have suggested that the sense of movement subjectivity may not consist only of prediction-matching results, Sotaro Shimada of Meiji University. We succeeded in showing it experimentally in collaboration with a professor and Takaki Maeda, a lecturer at Keio University.
In this study, XNUMX.Prediction-Time window to notice discrepancies in results and XNUMX.We measured the time window in which the sense of motor subjectivity was impaired due to the discrepancy between the prediction and the result, and investigated these correlations.
In Experiment 1, the subject was asked to rotate his index finger once, and the camera image that captured it was intentionally delayed by 100 to 1000 milliseconds and output to the monitor, and how long the subject noticed the delay. Quantified.
In Experiment 100, using a system in which ■ jumps on the screen when the subject presses a button, a delay of 1000 to XNUMX milliseconds is inserted between the button press and ■ jump, and the subject has a delay time of "". I quantified whether or not the feeling that I was moving ■ was impaired.
In this way, when the correlation between the "time window in which the delay is noticed" and the "time window in which the sense of exercise subject is impaired" is calculated, it is clear that although a certain relationship is found with each other, the relationship is by no means strong. became.In other words, the sense of motor subjectivity can be modified not only by prediction-results match / mismatch, but also by other factors.
It is hoped that future elucidation will be made as to what factors modify the sense of motor subjectivity.
Paper information:[PLoS One] The relationship and difference between delay detection ability and judgment of sense of agency
