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Brain events related to normal and moderately scrambled faces
1LENA, CNRS URA 654/UPMC, Hôpital de la Salpêtrière, Paris, France. lenang@ext.jussieu.fr
Brain Research. Cognitive Brain Research
|September 1, 1996
Summary
Investigating face processing, this study found distinct temporal negativities in brain activity. These signals, linked to visual cortex networks, predominantly occur in the right hemisphere for both normal and scrambled faces.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Brain Imaging
Background:
- Understanding the neural mechanisms of face perception is crucial for cognitive neuroscience.
- Distinguishing between processing of intact and distorted facial stimuli provides insights into visual processing networks.
Purpose of the Study:
- To investigate the neural basis of normal and scrambled face processing using electroencephalography (EEG).
- To identify the specific brain regions and temporal dynamics involved in face perception.
Main Methods:
- Recording evoked potentials from 21 electrodes at standard EEG sites.
- Utilizing scalp potential and current density mapping.
- Analyzing temporal negativities and their generators.
Main Results:
- Identified overlapping temporal negativities related to vertex P2 and processing negativity.
- Scalp potential and current density mappings suggest involvement of the superior temporal sulcus, inferotemporal cortex, parahippocampal, and fusiform gyri.
- Face and scrambled face encoding predominantly occurs in the right hemisphere.
Conclusions:
- Temporal negativities reflect both early visual processing (vertex P2) and later cognitive demands (processing negativity).
- Specific neuronal networks, including those in the temporal and fusiform regions, are implicated in face processing.
- Right hemisphere dominance is suggested for the encoding of facial stimuli.