The StartReact Effect on Self-Initiated Movements

Table 1

EMG and kinematic values for trials in which subjects performed a fast reaction with a wrist extension or a fast wrist extension at will.

Measures	RT	RS	ASb	ASc	ASl
Angular displacement (°)	55.04±6	53.63±11	52.33±7	51.04±14	56.11±14
Latency EMG (ms)	235.9±35	89.1±20		88.13±17
Latency of movement (ms)	287.4±37	146.7±9		145.88±24
Movement time (ms)	156.4±17	127.9±9	149.1±8	123.75±10	151.25±11
Time to peak velocity (ms)	85.23±13	57.6±12	96.25±13	58.25±10	99.38±19
Peak velocity (°/s)	414.4±43	577.0±60	409.88±49	589.01±66	393.38±59
iEMG*	100	318.1±101	104.05±32	236.38±93	107.88±20
OOc EMG latency		46.68±4	46.50±4	49.38±4	50.63±3
OOc EMG size		8225.5±2244	6379.88±1768	6186.76±2209	6729.1±2015

RT: values for the control trials in response to an imperative signal (IS). RS: values for the experimental trials in response to the IS with simultaneous startle. ASc, ASb, and ASl are wrist extension at will performed, respectively, close after SAS, before SAS, and long after SAS. *Reference values are 100 (dimensionless).