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Modulation of a fronto-parietal network in event-based prospective memory: an rTMS study
P S Bisiacchi1, G Cona, S Schiff
1Department of General Psychology, University of Padua, Padua, Italy. patrizia.bisiacchi@unipd.it
Neuropsychologia
|May 26, 2011
Summary
This study used transcranial magnetic stimulation (TMS) to explore prospective memory (PM). Findings show the right dorsolateral prefrontal cortex (DLPFC) is key for early PM target checking, while the left posterior parietal cortex (PPC) aids later intention retrieval.
Area of Science:
- Cognitive Neuroscience
- Neuropsychology
Background:
- Event-based prospective memory (PM) involves remembering to perform an action when a cue appears during ongoing tasks.
- Neuroimaging suggests prefrontal and parietal regions are crucial for PM, but their specific roles and timing remain unclear.
Purpose of the Study:
- To investigate the causal roles of frontal and parietal regions in distinct stages of prospective memory.
- To determine the temporal contribution of the right dorsolateral prefrontal cortex (DLPFC) and left posterior parietal cortex (PPC) to PM performance.
Main Methods:
- Utilized repetitive transcranial magnetic stimulation (rTMS) to temporarily disrupt neural activity in targeted brain regions.
- Applied rTMS to the right DLPFC and left PPC at specific time windows during a PM task.
Main Results:
- rTMS applied to the right DLPFC between 150-350 ms significantly impaired PM performance.
- rTMS applied to the left PPC between 400-600 ms also interfered with PM performance.
- These results indicate distinct temporal contributions of these regions to the PM process.
Conclusions:
- The right DLPFC is critically involved in the early phase of PM, specifically target checking.
- The left PPC plays a significant role in the later phase of PM, particularly intention retrieval.
- This study provides causal evidence for the differential involvement of frontal and parietal cortices in prospective memory.
