During EEG recording, a 40 Hz (gamma) oscillation is observed across widespread cortical areas during an attention-demanding perceptual task. What is the proposed functional significance of this gamma rhythm?
- A Maintenance of deep slow-wave sleep
- B Binding of disparate sensory features into a unified conscious percept ✓
- C Generation of sleep spindles in the thalamus
- D Suppression of motor cortical activity during REM atonia
Correct answer: B. Binding of disparate sensory features into a unified conscious percept
Explanation
Gamma oscillations (30-80 Hz, typically around 40 Hz) are hypothesized to serve as a mechanism for 'binding' distributed neural activity into a unified conscious experience, linking features like color, shape, and motion into a single perceived object. They occur during wakefulness and active cognitive processing. Sleep spindles are generated by the thalamic reticular nucleus and occur at 12-14 Hz, not 40 Hz.
Reference: Ganong's Review of Medical Physiology, 26th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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