Poster A93, Saturday, March 24, 1:30–3:30 pm, Exhibit Hall C
Sense of agency and motor performance are stronger when an individual is capable of motor prediction
Shu Morioka1, Kazuki Hayashida1, Akihiro Masuike1, Yuki NIshi1, Michihiro Osumi1, Satoshi Nobusako1; 1Kio University
Sense of agency (SoA) is a neurological component of consciousness that provides awareness of being the initiator and executor of one’s own actions. In this study, we developed a set of intentional binding (IB) tasks to track motor performance and investigate changes in SoA with or without motor prediction. Thirty university students were instructed to stop a circular object moving horizontally across a computer screen by pressing a key when it reached the center of a target circle. The task consisted of a “formula” condition in which the object’s speed was six levels and constant, and the movement pattern was governed by an undisclosed rule, and a “random” condition in which the object’s speed may not be constant. A “beep” sound was presented several hundred ms after the key press, and participants had to estimate the delay. The distance error (between the object and target centers) was used to approximate the motor performance index (MP); the time error (between the estimated and actual delays) represented the IB value, which is an index of SoA. Each task comprised 10 blocks of 18 trials/block. Afterwards, all participants were asked whether they noticed the rule; 18 (motor prediction group; MPG) answered affirmatively, and 12 negatively (no motor prediction group; NMPG). MP and SoA were significantly increased in the MPG than the NMPG, and SoA in the NMPG gradually declined over time. Our data suggest that the capacity for successful motor prediction is important for improving both motor performance and SoA.
Topic Area: PERCEPTION & ACTION: Motor control