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Spatiotemporal dynamics and connectivity pattern differences between centrally and peripherally presented faces
- Source :
- NeuroImage. 31(4)
- Publication Year :
- 2005
-
Abstract
- Most neuroimaging studies on face processing used centrally presented images with a relatively large visual field. Images presented in this way activate widespread striate and extrastriate areas and make it difficult to study spatiotemporal dynamics and connectivity pattern differences from various parts of the visual field. Here we studied magnetoencephalographic responses in humans to centrally and peripherally presented faces for testing the hypothesis that processing of visual stimuli with facial expressions of emotions depends on where the stimuli are presented in the visual field. Using our tomographic and statistical parametric mapping analyses, we identified occipitotemporal areas activated by face stimuli more than by control conditions. V1/V2 activity was significantly stronger for lower than central and upper visual field presentation. Fusiform activity, however, was significantly stronger for central than for peripheral presentation. Both the V1/V2 and fusiform areas activated earlier for peripheral than for central presentation. Fast responses in the fusiform were found at 70–80 ms after image onset, as well as a response at 130–160 ms. For peripheral presentation, contralateral V1/V2 and fusiform activated earlier (10 ms and 23 ms, respectively) and significantly stronger than their ipsilateral counterparts. Mutual information analysis further showed linked activity from bilateral V1/V2 to fusiform for central presentation and from contralateral V1/V2 to fusiform for lower visual field presentation. In the upper visual field, the linkage was from fusiform to V1/V2. Our results showed that face stimuli are processed predominantly in the hemisphere contralateral to the stimulation and demonstrated for the first time early fusiform activation leading V1/V2 activation for upper visual field stimulation.
- Subjects :
- Adult
Male
Visual perception
genetic structures
Eye Movements
Cognitive Neuroscience
Emotions
Individuality
Functional Laterality
Extrastriate body area
Face perception
Extrastriate cortex
medicine
Humans
Visual Cortex
Brain Mapping
Fusiform gyrus
Cognitive neuroscience of visual object recognition
Magnetoencephalography
Recognition, Psychology
Signal Processing, Computer-Assisted
Fusiform face area
Middle Aged
Magnetic Resonance Imaging
Visual field
medicine.anatomical_structure
Neurology
Data Interpretation, Statistical
Face
Visual Perception
Female
Visual Fields
Psychology
Neuroscience
Photic Stimulation
Psychomotor Performance
Subjects
Details
- ISSN :
- 10538119
- Volume :
- 31
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- NeuroImage
- Accession number :
- edsair.doi.dedup.....e40d185c0ae83212f9b80723c97c6b21