Table 1.

Mean RTs, DRs, and FAs

	Monkey M FEF		Monkey M LIP		Monkey Z FEF		Monkey Z LIP
	Valid	Invalid	Valid	Invalid	Valid	Invalid	Valid	Invalid
Mean RT (ms)	457	480	474	484	414	422	413	420
Mean DR (%)	79.6	62.9	77	61.2	66.8	62.4	66	57.2
Mean FA (%)	22		28		39		35

DRs are calculated as follows: hits/(hits + misses), where hits correspond to those target trials in which the monkey correctly produced a hand response from 150 to 750 ms after target presentation and misses correspond to all remaining target trials in which either an improper hand response was produced outside of the imposed response window or no hand response was given. FAs were calculated as follows: FAs/(FAs + correct rejections), where FAs correspond to those catch trials in which the monkey produced a hand response and correct rejections correspond to those in which the monkey correctly refrained from any hand response. Shown are FEF and LIP sessions and both valid and invalid trials (does not apply to FAs). Please note that DRs and FAs are not calculated over the same type of trials, so their sum does not amount to 100%.