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Neural processes underlying conscious perception: experimental findings and a global neuronal workspace framework
Claire Sergent1, Stanislas Dehaene
1Institut National de la Santé et de la Recherche Médicale Unité 562, Service Hospitalier Frédéric Joliot, Commissariat à l'énergie Atomique, Orsay, France. sergent@shfj.cea.fr
Journal of Physiology, Paris
|November 19, 2005
Summary
Conscious perception involves increased sensory activity and a fronto-parietal network, differing from non-conscious processing. This suggests a sharp, non-linear shift in brain activity for conscious awareness, not a gradual continuum.
Area of Science:
- Neuroscience
- Cognitive Science
- Psychology
Background:
- Perception can be conscious or non-conscious.
- Neural correlates of conscious versus non-conscious processing are debated.
- Existing theories propose a continuum of brain activation for perception.
Purpose of the Study:
- To differentiate neural mechanisms of conscious and non-conscious perception.
- To investigate the role of specific brain networks in conscious awareness.
- To test predictions of the global neuronal workspace model.
Main Methods:
- Review of empirical findings on neural activity during perception.
- Interpretation of data within the global neuronal workspace model framework.
- Analysis of sensory level activity, fronto-parietal network involvement, and functional connectivity.
Main Results:
- Conscious perception correlates with heightened sensory activity.
- A fronto-parietal network is specifically involved in conscious processing.
- Increased long-distance functional connectivity and synchrony are observed in conscious perception.
Conclusions:
- Conscious access may arise from a self-amplifying process.
- This process leads to global brain-scale activity patterns.
- The model predicts a sharp, non-linear transition between non-conscious and conscious states.