Abstract
We used functional magnetic resonance imaging (fMRI) to investigate the relation between left and right prefrontal cortex (PFC) and task complexity in episodic memory. In Experiments 1A, 1B, and 1C, left PFC activity (and, in Experiment 1C, right PFC as well) was greater for source identification than for old/new recognition, indicating that left PFC is likely to be recruited when specific features of episodic memories are considered. In Experiment 2, we found greater activity in PFC areas more medial or more ventral to those found in Experiments 1A-1C in successive recognition relative to forced-choice recognition, indicating that the regions of PFC recruited depend on the nature of the task complexity. Furthermore, Experiment 2 provided evidence consistent with the hypothesis that increased processing complexity may require interhemispheric interaction. In Experiments 1A, 1C, and 2, increased task complexity also increased activity in anterior cingulate (ACC), consistent with the idea that ACC interacts with PFC to control processing during remembering.
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