Embodiment and the origin of interval timing: kinematic and electromyographic data

Addyman, Caspar and Rocha, Sinead - Elouise and Fautrelle, L. and French, R. and Thomas, E. and Mareschal, Denis (2016) Embodiment and the origin of interval timing: kinematic and electromyographic data. Experimental Brain Research 235 (3), pp. 923-930. ISSN 0014-4819.

Abstract

Recent evidence suggests that interval timing (the judgment of durations lasting from approximately 500 ms. to a few minutes) is closely coupled to the action control system. We used surface electromyography (EMG) and motion capture technology to explore the emergence of this coupling in 4-, 6-, and 8-month-olds. We engaged infants in an active and socially relevant arm-raising task with 7 cycles and response period. In one condition cycles were slow (every 4 seconds) in another they were fast (every 2 seconds). In the slow condition, we found evidence of time locked sub-threshold EMG activity even in the absence of any observed overt motor responses at all 3 ages. This study shows that EMGs can be a more sensitive measure of interval timing in early development than overt behavior.

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