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Simultaneous Recording of Electroretinography and Visual Evoked Potentials in Anesthetized Rats
Published on: July 1, 2016
Antagonistic relationship between gamma power and visual evoked potentials revealed in human visual cortex
Eran Privman1, Lior Fisch, Miri Y Neufeld
1Blavatnik School of Computer Science, Tel-Aviv University, Tel-Aviv 69978, Israel.
Cerebral Cortex (New York, N.Y. : 1991)
|July 14, 2010
Summary
A novel study on human intracranial recordings reveals that evoked potential suppression (EPS) is not linked to reduced gamma power or recognition behavior. Instead, EPS correlates with preceding gamma activity, suggesting neural desynchronization rather than overall activity attenuation.
Area of Science:
- Neuroscience
- Human intracranial recordings
- Visual evoked potentials
Background:
- Scalp electroencephalography (EEG) and magnetoencephalography (MEG) show evoked potential adaptation, where a second stimulus suppresses the event-related potential (ERP).
- This phenomenon, termed evoked potential suppression (EPS), has been investigated using subdural intracranial recordings in humans.
Purpose of the Study:
- To investigate evoked potential suppression (EPS) using subdural intracranial recordings in humans.
- To determine the relationship between EPS, gamma frequency power, and neural activity markers.
Main Methods:
- Subdural intracranial recordings in human participants.
- Analysis of event-related potentials (ERPs) and gamma frequency power.
- Correlation analysis with preceding neural activity and recognition behavior.
Main Results:
- Subdural ERP suppression was not associated with reduced gamma power, a marker of neural activity.
- Evoked potential suppression (EPS) did not correlate with patient recognition behavior.
- EPS was strongly linked to the preceding gamma activity level, independent of interstimulus interval.
Conclusions:
- A consistent antagonism exists between subdural ERP and gamma power, despite both being neural activity markers.
- The study hypothesizes that ERP suppression results from neuronal firing desynchronization due to recurrent neural activity, not overall activity reduction.
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