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Han-Gue Jo1,2, Junji Ito3, Barbara Schulte Holthausen4

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Cognitive processes like searching and memorizing alter functional connections in the brain's visual ventral stream. This visual hierarchy dynamically reorganizes to prioritize relevant object recognition features.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • The ventral stream's visual hierarchy is well-researched, but its functional coupling during top-down cognitive tasks is not fully understood.
  • Understanding how the brain processes visual information dynamically is crucial for explaining object recognition.

Purpose of the Study:

  • To investigate task-dependent functional connectivity within the ventral stream during different object recognition processes.
  • To explore how cognitive demands (searching vs. memorizing) modulate neural activity and connectivity in the visual hierarchy.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to study 28 participants.
  • Participants performed object recognition tasks: searching, memorizing, or free viewing of natural scene images.
  • A seed-based correlation approach analyzed Blood-Oxygen-Level-Dependent (BOLD) time-series to map functional connectivity.

Main Results:

  • Searching tasks revealed distinct correlated and anti-correlated connectivity patterns, separating early visual areas (V1, V4) from higher-level areas (posterior inferior temporal cortex - PIT).
  • Memorizing tasks maintained correlated connectivity but increased coupling between right V4 and PIT.
  • V1 and V4 showed task-dependent activation, while PIT was deactivated, indicating differential processing across the ventral stream.

Conclusions:

  • The visual ventral stream exhibits context-dependent functional connectivity, dynamically adapting to cognitive demands.
  • The visual hierarchy selectively organizes to bias object recognition based on task-relevant features.
  • These findings provide insights into the neural mechanisms underlying flexible visual perception and object recognition.