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Central and Divided Visual Field Presentation of Emotional Images to Measure Hemispheric Differences in Motivated Attention
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Dissociating activity in the lateral intraparietal area from value using a visual foraging task.

Koorosh Mirpour1, James W Bisley

  • 1Department of Neurobiology, David Geffen School of Medicine at University of California (UCLA), Los Angeles, CA 90095, USA. kmirpour@mednet.ucla.edu

Proceedings of the National Academy of Sciences of the United States of America
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Neural activity in the lateral intraparietal area (LIP) may not directly represent value for eye movements. Further processing of LIP activity is needed to extract value and guide decisions in complex visual environments.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Eye movements are crucial for visual exploration, occurring about three times per second.
  • The lateral intraparietal area (LIP) is hypothesized to guide saccades by representing object value.
  • Prioritization of saccade goals in cluttered environments remains unclear.

Purpose of the Study:

  • To investigate how neural activity in LIP relates to value-based saccade selection during free-viewing.
  • To determine if LIP neuronal firing rates correlate with behavioral choices and estimated stimulus values.
  • To explore the role of LIP in prioritizing visual information for action in complex scenes.

Main Methods:

  • Recorded LIP neuronal responses in two subjects during a visual foraging task.
  • Parametrically varied the number of objects on screen to control environmental complexity.
  • Compared LIP firing rates with saccadic behavior and three distinct measures of stimulus value.

Main Results:

  • LIP neuronal firing rates showed poor correlation with saccadic behavior and estimated values.
  • Normalization of LIP activity significantly improved its correlation with behavioral decisions.
  • These findings suggest LIP activity itself doesn't encode value directly in complex settings.

Conclusions:

  • Lateral intraparietal area (LIP) activity likely represents attentional priority, not direct value.
  • Downstream normalization of LIP signals is essential for extracting value and guiding actions.
  • This processing step is critical for decision-making in cluttered visual environments.