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Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography
Published on: July 26, 2019
Early event-related potential components in face perception reflect the sequential neural activities
1Department of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Sheng Li Xue Bao : [Acta Physiologica Sinica]
|April 21, 2011
Summary
Early face processing involves distinct brain signals. This study identified a negative counterpart (VN120) to the P120 component, revealing synchronized neural activities in the fusiform gyrus for face perception.
Area of Science:
- Neuroscience
- Cognitive Science
- Psychology
Background:
- Event-related potentials (ERPs) like P120, N170, and VPP are linked to early face processing.
- Existing research suggests VPP is the positive counterpart to N170, originating from shared neural sources.
- The existence of a negative counterpart to P120 and the precise relationships among these early face-sensitive ERP components remain incompletely understood.
Purpose of the Study:
- To investigate the existence of a negative counterpart to the P120 component in face processing.
- To elucidate the relationships and common neural sources among early face-sensitive ERP components (P120, N170, VPP).
- To explore the sequential neural activities underlying face perception.
Main Methods:
- Scalp electroencephalogram (EEG) was recorded during passive viewing of various stimuli.
- Event-related potentials (ERPs) were calculated from the EEG data.
- Synchronization of EEG signals between fronto-central and bilateral occipitotemporal sites was analyzed.
- Independent Component Analysis (ICA) was utilized to identify face-sensitive components and their brain sources.
Main Results:
- A negative counterpart, termed VN120, was identified for the P120 component.
- The VN120-VPP and P120-N170 complexes were found to originate from common sources.
- These common sources were localized to the fusiform gyrus, indicating shared neural generators for these ERP components.
- The findings suggest sequential neural activities within these sources reflect face processing.
Conclusions:
- P120 has a negative counterpart, VN120, contributing to the early stages of face perception.
- VN120-VPP and P120-N170 complexes represent distinct but related temporal aspects of face processing.
- The fusiform gyrus is a key neural substrate generating these early face-sensitive ERP components, reflecting a coordinated neural sequence.
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