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Shared Neural Activity But Distinct Neural Dynamics for Cognitive Control in Monkey Prefrontal and Parietal Cortex
Rachael K Blackman1,2,3, David A Crowe2,4, Adele L DeNicola1,2
1Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota 55455.
Summary
Researchers studied prefrontal cortex (PFC) and parietal cortex in monkeys to understand cognitive control deficits seen in schizophrenia. Both brain areas showed similar single-neuron activity but distinct population dynamics, suggesting different roles in cognitive control.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Primate Neurophysiology
Background:
- Schizophrenia is associated with cognitive control deficits.
- Prefrontal cortex (PFC) and parietal cortex are implicated in cognitive control.
- Understanding neural mechanisms underlying cognitive control is crucial for treating related disorders.
Purpose of the Study:
- To investigate how prefrontal and parietal cortical networks mediate cognitive control.
- To characterize neural activity in PFC and parietal cortex during a task measuring cognitive control relevant to schizophrenia.
- To compare the roles of PFC and parietal cortex in proactive and reactive cognitive control.
Main Methods:
- Recorded neural activity (single-unit and local field potentials) in the PFC and parietal cortex of two male monkeys.
- Utilized a variant of the AX continuous performance task, adapted to study cognitive control deficits.
- Analyzed neural firing rates, population dynamics, oscillatory activity, and temporal correlations during task performance.
Main Results:
- Parietal and PFC neurons showed similar activity patterns at the single-neuron level.
- Distinct population dynamics were observed between PFC and parietal cortex, indicating differential contributions.
- PFC exhibited stronger and more persistent encoding of contextual information compared to parietal cortex.
- Cognitive control demand biased contextual information representation towards the PFC and increased neural synchrony.
Conclusions:
- While single neurons show similar task-evoked activity, distinct population dynamics in PFC and parietal cortex suggest specialized roles in cognitive control.
- PFC and parietal cortex contribute differentially to cognitive control, with evidence for proactive and reactive control mechanisms in both areas.
- Findings provide insights into the neural basis of cognitive control deficits relevant to schizophrenia.
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