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Published on: November 16, 2017
Visual awareness, emotion, and gamma band synchronization.
Qian Luo1, Derek Mitchell, Xi Cheng
1Mood and Anxiety Disorders Program, MEG Core Facility, National Institute of Mental Health, 15K North Drive, MSC 2670, Bethesda, MD 20892, USA. luoj@mail.nih.gov
Cerebral Cortex (New York, N.Y. : 1991)
|December 3, 2008
Summary
Synchronized neural firing in the gamma band is linked to conscious awareness. However, this gamma band event-related synchronization (ERS) also occurs with emotional stimuli, suggesting it
Area of Science:
- Neuroscience
- Cognitive Science
- Psychology
Background:
- Consciousness is a fundamental aspect of human experience.
- A leading hypothesis suggests that synchronized neural activity in the gamma frequency band (gamma band event-related synchronization or ERS) is crucial for conscious awareness.
- The precise role of gamma band ERS in both the content and emotional valence of conscious experience requires further investigation.
Purpose of the Study:
- To investigate the association between gamma band ERS and conscious awareness.
- To determine if gamma band ERS correlates with stimulus detectability versus emotional content.
- To explore the neural correlates of consciousness using advanced brain imaging.
Main Methods:
- Utilized brain-imaging techniques with high spatiotemporal resolution and frequency-specific analysis.
- Measured event-related synchronization (ERS) in the gamma frequency band.
- Examined the relationship between gamma band ERS, stimulus awareness (detectability), and emotional valence.
Main Results:
- Increased gamma band ERS was observed in prefrontal-anterior cingulate, visual, parietal, posterior cingulate, and superior temporal cortices for stimuli consciously perceived.
- Elevated gamma band ERS was also found in the amygdala, visual, prefrontal, parietal, and posterior cingulate cortices for emotional stimuli, regardless of conscious awareness.
- Gamma band ERS appears to be related to, but not solely sufficient for, conscious awareness.
Conclusions:
- Gamma band ERS is involved in processing stimuli that reach conscious awareness.
- Emotional content of stimuli also drives gamma band ERS, independent of conscious access.
- These findings suggest a complex relationship between neural synchrony, emotion, and consciousness.
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