Neuroscience 2005 Abstract
| Presentation Number: | 469.10 |
|---|---|
| Abstract Title: | Face and object processing in the fusiform gyrus: a comparison of intracranial ERP recordings and functional MRI. |
| Authors: |
Diaz, M. T.*1
; Morris, J. P.1
; Vives, K.3
; Spencer, D. D.3
; McCarthy, G.1,2
1Brain Imaging & Analysis Ctr, Duke Univ., Durham, NC 2NC, Brain Imaging & Analysis Ctr, 27710, 3USA, Brain Imaging & Analysis Ctr, 27710, |
| Primary Theme and Topics |
Cognition and Behavior - Human Cognition, Behavior, and Anatomy -- Perception and imagery |
| Session: |
469. Perception and Imagery I Slide |
| Presentation Time: | Monday, November 14, 2005 3:15 PM-3:30 PM |
| Location: | Washington Convention Center - Room 143A |
| Keywords: | PERCEPTION, EXTRASTRIATE, BRAIN IMAGING |
The degree to which visual processing within ventral extrastriate brain regions, including the fusiform gyrus, is domain specific is a contentious issue. Part of the controversy may stem from the differing nature of the measures used to investigate this issue. Functional MRI measures hemodynamic changes that evolve over seconds and involve venous elements that may overestimate the spatial extent of neural activation. Direct electrical recording through subdural electrode strips and grids provide an alternative measure of neural activity with high spatial and temporal resolution. Here we will discuss two experiments that used identical presentations of visual stimuli comprising many object categories including faces. Direct electrical recordings in a sample of patients undergoing intracranial investigation for epilepsy were compared to fMRI responses evoked by the same stimuli in controls. In the present studies, we presented a series of objects from several categories and faces. Interspersed within this series were abstract patterns with the same spatial frequency and luminance as the faces and objects. Results from the intracranial study indicated large focal potentials in the fusiform gyrus for faces, but not for non-face objects. In the fMRI study, large ventral activations were found in which a medial to lateral distribution of response was noted, where medial regions, which extended to the parahippocampal gyrus, responded more strongly to objects and lateral regions responded more strongly to faces.
Supported by NIMH grant MH 05286 & Dept of Veterans Affairs Research Career Scientist Award to GM.
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2005 Neuroscience Meeting Planner. Washington, DC: Society for Neuroscience, 2005. Online.
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