Table 5. Experiment 2: Results of Wilcoxon Matched-Pairs, Signed-Ranks Test Comparing Accuracy on 2- vs. 8-s ITI Durations Under Trial-unique and Two-sample Procedures.

Comparisons	Significance level*	Number of pairs	Critical sum of ranks	Sum of ranks
2-s ITI vs. 8-s ITI
Two-sample	p < .01	21	49	47.5
Trial-unique	p > .05	20	52	68.5

^*One-tailed.