Table 1. Effect of the memory task difficulty on the attention task performances.

Mean percentage of correct responses, mean number of false alarms and mean reaction time (and their standard error to mean, s.e.m.) in the attention task are indicated as a function of the memory task difficulty.

		Memory task
		No	Easy	Difficult
Attention task	Correct response %	93.40 ±1.35	91.60 ±1.71	88.50 ±2.3
	Number of false alarms	0.50 ±0.13	0.62 ±0.18	1.19 ±0.31
	Reaction time (ms)	422 ±17	444 ±22	448 ±21