Table 1. Summary of behavioral results.

			SICI			LICI
no-TMS			Young	Older		Young	Older
Early response (%)			0 ± 0	0.07 ± 0.27		0 ± 0	0.23 ± 0.48
No response (%)			0.49 ± 1.25	0.35 ± 0.78		0.62 ± 1.71	0.55 ± 1.06
P(inhibit) %			53.2 ± 1.7	52.7 ± 1.6		52.2 ± 0.8	52.4 ± 1.7
SSRT (ms)			192 ± 15	207 ± 19		195 ± 13	205 ± 23
GoRT (ms)	0%		801 ± 11	808 ± 18		803 ± 12	806 ± 24
	20%		814 ± 11	820 ± 15		813 ± 10	820 ± 27
	40%		822 ± 13	838 ± 26		825 ± 13	831 ± 28
TMS
Stop time (ms)			547 ± 17	534 ± 27		545 ± 18	536 ± 27
P(inhibit) %			70.6 ± 7.6	67.8 ± 11.6		70.2 ± 7.6	65.1 ± 11.6

Data are reported as mean ± SD. Go response times (GoRTs) are reported from bar fill onset, the target was situated 800ms from bar fill onset. Early responses are GoRTs < 400 ms, whereas no responses are GoRTs > 1280 ms. Percentage of early responses and no responses were averaged across the three stop-signal probability conditions. LICI: long-interval intracortical inhibition, SICI: short-interval intracortical inhibition, SSRT: stop-signal reaction time, TMS: transcranial magnetic stimulation.