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Related Experiment Video

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Central and Divided Visual Field Presentation of Emotional Images to Measure Hemispheric Differences in Motivated Attention
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Spatial and temporal distribution of visual information coding in lateral prefrontal cortex.

Mikiko Kadohisa1, Makoto Kusunoki, Philippe Petrov

  • 1MRC Cognition and Brain Sciences Unit, Cambridge, UK; Department of Experimental Psychology, University of Oxford, South Parks Rd, Oxford, OX1 3UD, UK.

The European Journal of Neuroscience
|October 14, 2014
PubMed
Summary
This summary is machine-generated.

Prefrontal cortex neurons process visual information bilaterally. Early responses favor contralateral stimuli, while later responses involve both hemispheres, reflecting behavioral decisions.

Keywords:
behaving monkeydynamic codingfrontal specialisationprefrontal cortex

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Primate Research

Background:

  • Prefrontal cortex neurons are crucial for processing visual information relevant to behavior.
  • Understanding the spatial and temporal coding of visual stimuli in the prefrontal cortex is essential for deciphering decision-making processes.

Purpose of the Study:

  • To investigate how prefrontal cortex neurons encode object identity, behavioral categories, and spatial locations.
  • To examine the temporal dynamics of neural activity in the lateral prefrontal cortex during a visual detection task.
  • To compare neural coding across dorsal and ventral prefrontal regions and between cerebral hemispheres.

Main Methods:

  • Used a cued target detection task in behaving monkeys.
  • Recorded neural activity from dorsal and ventral lateral prefrontal cortex (areas 9, 46, 45A, 8A) across both hemispheres.
  • Analyzed the temporal evolution of neuronal selectivity for objects, categories, and locations.

Main Results:

  • Little regional specialization was found within hemispheres; dorsal and ventral regions showed similar selectivity patterns.
  • Hemispheres exhibited temporally specific differences in response to visual stimuli.
  • Early visual responses (50-250 ms) were primarily contralateral, showing object and category selectivity.
  • Later responses (300-500 ms) included ipsilateral stimuli, with some cells showing stronger ipsilateral than contralateral responses and category selectivity.
  • Activity on error trials indicated that late neural activity reflected the animal's decision.

Conclusions:

  • Neural encoding of visual information in the prefrontal cortex is largely bilateral and spreads as a decision is formed.
  • Hemispheric processing shows temporal dynamics, shifting from contralateral to bilateral involvement.
  • Late prefrontal activity, including on error trials, is linked to the final behavioral decision.