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Related Experiment Videos

Mnemonic coding of visual space in the monkey's dorsolateral prefrontal cortex.

S Funahashi1, C J Bruce, P S Goldman-Rakic

  • 1Section of Neuroanatomy, Yale University School of Medicine, New Haven, Connecticut 06510.

Journal of Neurophysiology
|February 1, 1989
PubMed
Summary

Neurons in the primate prefrontal cortex (PS) show directional delay period activity, crucial for spatial memory during a delayed-response task. This activity helps guide eye movements to remembered visual cue locations.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience

Background:

  • The prefrontal cortex (PFC) plays a critical role in higher cognitive functions, including spatial memory and working memory.
  • Understanding the neural mechanisms underlying spatial memory is essential for comprehending complex cognitive processes.

Purpose of the Study:

  • To investigate the spatial memory functions of neurons in the primate prefrontal cortex (PS) using an oculomotor delayed-response task.
  • To characterize the activity patterns of PS neurons during the delay period of a task requiring the recall of visual cue locations.

Main Methods:

  • Monkeys performed a delayed-response task involving fixation, cue presentation, a delay period, and a saccadic eye movement to the remembered cue location.
  • Electrophysiological recordings were obtained from 288 neurons in the PS and 31 neurons in the frontal eye fields (FEF) during task performance.

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  • Task-related neuronal activity, particularly during the delay period, was analyzed for directional selectivity and modulation relative to spontaneous activity.

    • Main Results:

    • Out of 288 PS neurons, 170 showed task-related activity, with 87 exhibiting significant delay period modulation.
    • Of these 87 neurons, 79% were directionally tuned, responding selectively to specific visual field locations, while 21% were omnidirectional.
    • Neurons with excitatory delay period activity were predominantly directional (92%), whereas those with inhibitory activity showed a mix of directional (62%) and omnidirectional (38%) responses.

    Conclusions:

    • Neurons in the primate prefrontal cortex exhibit significant delay period activity that is often spatially tuned, supporting spatial memory functions.
    • This directional activity is crucial for guiding oculomotor responses to remembered visual targets.
    • The findings elucidate the neural basis of spatial working memory within the prefrontal cortex.