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Related Experiment Videos

Prefrontal unit activity during delayed-response and delayed-alternation performances

K Kubota

    The Japanese Journal of Physiology
    |January 1, 1975
    PubMed
    Summary
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    Single unit activity in the dorsolateral prefrontal cortex was examined in rhesus monkeys during delayed-response and delayed-alternation tasks. Findings suggest these brain regions may not directly encode choices for reward-based alternation.

    Area of Science:

    • Neuroscience
    • Primate Cognition
    • Prefrontal Cortex Function

    Background:

    • The dorsolateral prefrontal cortex (DLPFC) is implicated in cognitive tasks requiring working memory and decision-making.
    • Previous research has identified specific neuronal activities in the DLPFC during delayed-response tasks.

    Purpose of the Study:

    • To investigate the role of DLPFC single unit activity in delayed-alternation tasks by comparing it with activity during delayed-response tasks.
    • To determine if DLPFC neuronal activity differentially encodes choices related to reward in a delayed-alternation paradigm.

    Main Methods:

    • Extracellular recordings of single unit activity in the DLPFC of rhesus monkeys using tungsten electrodes.
    • Monkeys performed both delayed-response and delayed-alternation tasks, with visual cues indicating left or right locations.

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  • Analysis focused on neuronal discharge rates during cue presentation and response phases for both tasks.

    • Main Results:

    • Ninety-five units were recorded; two-thirds were visuokinetic, activated during cue phases.
    • Visuokinetic units showed no consistent differential activity between tasks or between left/right trials in delayed-alternation.
    • A subset of units (E units) showed activity patterns consistent with previous delayed-alternation studies, but no activity correlated with alternative reward choices was identified.

    Conclusions:

    • DLPFC single unit activity, particularly visuokinetic units, does not appear to directly encode the choice of reward in delayed-alternation tasks.
    • The findings suggest that while DLPFC is involved in these tasks, its role in specific choice-based alternation may be more complex or involve other neuronal populations.
    • Further research is needed to fully elucidate the mnemonic functions of the DLPFC in relation to complex decision-making and reward-based alternation.