Abstract
The rostral prefrontal cortex (rPFC) is crucial in prospective memory (PM) behavior. Several functional magnetic resonance imaging studies showed that its medial (mrPFC) and lateral (lrPFC) portions dissociate during PM tasks. In light of the Multiprocess theory (McDaniel and Einstein 2000), here we tested whether the two portions of the rPFC are dissociable by modulating strategic vs. spontaneous processes during a PM task. We investigated these two processes by means of a 2 × 2 experimental design in which focal vs. non-focal conditions were modulated by varying the conjoint nature of the ongoing task (i.e., lexical decision vs. syllable matching) and the PM cue (words vs. syllables). Using the two portions of the rPFC as regions of interest, we found an effect of the non-focal condition in the lrPFC and, conversely, an effect of the focal condition in the mrPFC. In the whole-brain analysis we found an effect of the non-focal condition in the bilateral intraparietal sulcus, the bilateral middle frontal gyrus, the supplementary motor areas and the vermis of the cerebellum, whereas we found an effect of the focal condition in the ventromedial PFC. Overall, our results show that different brain regions are involved when multiple processes underlying PM behavior are modulated.
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Notes
Here we provided a description of the localizer task, for more detailed information the reader is referred to the original paper (Barban et al. 2014). The localizer task comprised 7 ONG and 7 PM blocks of 10 trials each. PM and ONG blocks were presented randomly but, in order to prevent contamination, each PM block was followed by a block of the ONG task using geometrical shapes instead of letters (wash-out block). ONG blocks started with a green X (5 s); participants executed the ONG task alone. PM blocks started with a red fixation X (5 s) with above two letters as PM cues. For each ONG trial, participants were administered a single target letter immediately below a fixation cross for 1 s. After its offset, a horizontal four-letters string appeared for 1.5 s. The string always contained the target letter. Participants were required to press a first button with their forefinger if the target letter appeared in one of the two left positions of the string and to press a second button with their middle finger if the target letter appeared in one of the two right positions of the string. The PM task consisted in pressing a third button with the ring finger whenever a PM cue letter was present in a letter string of the PM task.
Delta RT of PM trials reflected the differences between the time occurring for executing the PM action (i.e., the second pressing on the button-pad) and the time occurring for executing the ONG task during the BAS blocks.
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Barban, F., Scalici, F., Carlesimo, G.A. et al. Medio-lateral functional dissociation of the rostral prefrontal cortex with focal/non-focal cues during a prospective memory task. Brain Imaging and Behavior 14, 1175–1186 (2020). https://doi.org/10.1007/s11682-019-00063-1
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DOI: https://doi.org/10.1007/s11682-019-00063-1