Table 1:

Trial properties for three versions of the GNG/CPT task

	Test version
	1: 3 - 4 years	2: 5 - 6 years	3: 7 + years
Stimulus display time	1500ms	750ms	500ms
Feedback stimulus time	750ms	750ms	750ms
Inter-trial interval*	1000ms	750ms	500ms
Trials per phase	60	80	100
Trials per subblock	15	20	25
# ‘Go’ trials per subblock – GNG phase	10 - 13	11 - 17	17 - 22
# ‘Go’ trials per subblock – CPT phase	3 - 4	4 - 6	6 - 7

^*From the end of the feedback stimulus or stimulus to subsequent stimulus