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Attention modulates neuronal correlates of interhemispheric integration and global motion perception
Burak Akin1, Ceylan Ozdem2, Seda Eroglu3
1Department of Radiology, Medical Physics, University Medical Center Freiburg, Germany.
Journal of Vision
|October 29, 2014
Summary
The human brain integrates visual information from both hemispheres for a unified visual field. Attention influences this integration, particularly in higher visual areas, to perceive global motion.
Area of Science:
- Neuroscience
- Visual Perception
- Cognitive Science
Background:
- The human visual system processes information from left and right visual hemifields (VHFs) contralaterally.
- Despite hemispheric segregation, we perceive a unified visual field, but the integration mechanism is unclear.
Purpose of the Study:
- To investigate brain areas involved in interhemispheric integration for unified global motion perception.
- To explore the role of attention in this integration process.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to study brain activity.
- Participants viewed 2D objects with parts in both VHFs, creating perceived global motion.
Main Results:
- Lateral occipital areas, including the medial temporal complex, are crucial for unified global motion perception.
- Early visual areas (LGN, V1) showed perceptual correlates only when attention was not diverted.
Conclusions:
- Attention modulates interhemispheric integration in motion perception.
- Both higher-tier and early visual areas, through feedback, contribute to the unified visual field experience.
Keywords:
fMRIglobal motion perceptioninterhemispheric integrationperceptual experience of unified visual fieldvisual brainMore Related Videos
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