Fig. 5.

Activation in the PC/PCC for the VSTM task as a function of set size and state for 30 participants. There was a strong effect of set size. The effect of state was not significant when all participants were analyzed as a group. However, when a comparison was made between participants who responded to at least 95% of the trials on the VSTM and VAC tasks after SD (nonlapsers; n = 14) and lapsers (n = 16), there was a significant interaction of state, set size, and group. This interaction reflects the finding of lesser deactivation after SD for those who lapsed more when sleep deprived and indicates that this effect was present mainly at higher visual loads.