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Intrinsic Functional Connectivity Patterns of The Object-Selective Visual Areas.

Ulaş Ay1,2, Tamer Demiralp3

  • 1Department of Neuroscience, Aziz Sancar Institute of Experimental Medicine, Istanbul University, İstanbul, Türkiye.

Noro Psikiyatri Arsivi
|June 30, 2025
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Summary

The study reveals distinct functional connectivity patterns for the lateral occipital (LO) and posterior fusiform (pF) regions, crucial for object recognition. These differences highlight their specialized roles in visual processing and integrating object-related information.

Keywords:
Intrinsic functional connectivitylateral occipital complexlateral occipital cortexobject perceptionposterior fusiform cortex

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • The lateral occipital complex (LOC), comprising lateral occipital (LO) and posterior fusiform (pF) cortices, is a key area for object perception.
  • Understanding the intrinsic functional connectivity (iFC) of these regions is crucial for elucidating object recognition mechanisms.

Purpose of the Study:

  • To investigate the intrinsic functional connectivity (iFC) patterns of the object-selective lateral occipital (LO) and posterior fusiform (pF) regions.
  • To differentiate the functional roles of LO and pF in object recognition based on their connectivity.

Main Methods:

  • Utilized functional magnetic resonance imaging (fMRI) on 15 healthy participants.
  • Identified LO and pF regions using a standard localizer task and activation analyses.
  • Analyzed resting-state fMRI data to determine the intrinsic functional connectivity (iFC) of LO and pF.

Main Results:

  • LO exhibited a widely distributed connectivity network with extensive occipitotemporal, occipitoparietal, and motor connections.
  • pF demonstrated a more localized, bilateral connectivity pattern along the ventral visual stream.
  • LO connections were predominantly ipsilateral, while pF connections were bilateral.

Conclusions:

  • The distinct iFC patterns of LO and pF suggest specialized roles in object perception and recognition.
  • pF's bilateral connectivity supports its role in the ventral visual stream for object processing.
  • LO's extensive and lateralized connectivity indicates its involvement in integrating visual information, attention, and action recognition.