RRC ID 64880
著者 Takeya R, Nakamura S, Tanaka M.
タイトル Spontaneous grouping of saccade timing in the presence of task-irrelevant objects.
ジャーナル PLoS One
Abstract Sequential movements are often grouped into several chunks, as evidenced by the modulation of the timing of each elemental movement. Even during synchronized tapping with a metronome, we sometimes feel subjective accent for every few taps. To examine whether motor segmentation emerges during synchronized movements, we trained monkeys to generate a series of predictive saccades synchronized with visual stimuli which sequentially appeared for a fixed interval (400 or 600 ms) at six circularly arranged landmark locations. We found two types of motor segmentations that featured periodic modulation of saccade timing. First, the intersaccadic interval (ISI) depended on the target location and saccade direction, indicating that particular combinations of saccades were integrated into motor chunks. Second, when a task-irrelevant rectangular contour surrounding three landmarks ("inducer") was presented, the ISI significantly modulated depending on the relative target location to the inducer. All patterns of individual differences seen in monkeys were also observed in humans. Importantly, the effects of the inducer greatly decreased or disappeared when the animals were trained to generate only reactive saccades (latency >100 ms), indicating that the motor segmentation may depend on the internal rhythms. Thus, our results demonstrate two types of motor segmentation during synchronized movements: one is related to the hierarchical organization of sequential movements and the other is related to the spontaneous grouping of rhythmic events. This experimental paradigm can be used to investigate the underlying neural mechanism of temporal grouping during rhythm production.
巻・号 16(3)
ページ e0248530
公開日 2021-1-1
DOI 10.1371/journal.pone.0248530
PII PONE-D-20-39755
PMID 33724997
PMC PMC7963089
MeSH Animals Female Fixation, Ocular / physiology Form Perception / physiology Macaca mulatta Male Models, Animal Photic Stimulation / methods Reaction Time / physiology Saccades / physiology* Spatial Learning / physiology*
IF 2.74
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