Monkeys time their pauses of movement and not their movement-kinematics during a synchronization-continuation rhythmic task

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Donnet, S (Author) Other; Bartolo, R (Author) Other; Fernandes, JM (Author) Other; Cunha, JPS (Author) FEUP; Prado, L (Author) Other; Merchant, H (Author) Other

Journal

Title: Journal of Neurophysiology

Vol. 111

Pages: 2138-2149

ISSN: 0022-3077

Publisher: American Physiological Society

Indexing

ISI Web of Knowledge - 26 Citations

Scopus - 27 Citations

Other information

Authenticus ID: P-009-D9S

DOI: 10.1152/jn.00802.2013

Abstract (EN): A critical question in tapping behavior is to understand whether the temporal control is exerted on the duration and trajectory of the downward-upward hand movement or on the pause between hand movements. In the present study, we determined the duration of both the movement execution and pauses of monkeys performing a synchronization-continuation task (SCT), using the speed profile of their tapping behavior. We found a linear increase in the variance of pause-duration as a function of interval, while the variance of the motor implementation was relatively constant across intervals. In fact, 96% of the variability of the duration of a complete tapping cycle (pause + movement) was due to the variability of the pause duration. In addition, we performed a Bayesian model selection to determine the effect of interval duration (450 -1,000 ms), serial-order (1-6 produced intervals), task phase (sensory cued or internally driven), and marker modality (auditory or visual) on the duration of the movement-pause and tapping movement. The results showed that the most important parameter used to successfully perform the SCT was the control of the pause duration. We also found that the kinematics of the tapping movements was concordant with a stereotyped ballistic control of the hand pressing the push-button. The present findings support the idea that monkeys used an explicit timing strategy to perform the SCT, where a dedicated timing mechanism controlled the duration of the pauses of movement, while also triggered the execution of fixed movements across each interval of the rhythmic sequence.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12