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We apply Dynamic Causal Models to electrocorticogram recordings from twomacaque monkeys performing a problem-solving task that engages working memory,and induces time-on-task effects. We thus provide a computational account ofchanges in effective connectivity within two regions of the fronto-parietalnetwork, the dorsolateral prefrontal cortex and the pre-supplementary motorarea. We find that forward connections between the two regions increased instrength when task demands increased, and as the experimental sessionprogressed. Similarities in the effects of task demands and time on task allowus to interpret changes in frontal connectivity in terms of increasedattentional effort allocation that compensates cognitive fatigue.

Frontal effective connectivity increases with task demands and time on task: a Dynamic Causal Model of electrocorticogram in macaque monkeys