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Levels of categorization in visual recognition studied using functional magnetic resonance imaging
I Gauthier1, A W Anderson, M J Tarr
1Department of Psychology, Yale University, PO Box 208205, New Haven, Connecticut 06520-8205, USA. isabel.gauthier@yale.edu
Current Biology : CB
|September 1, 1997
Summary
Brain regions for face recognition also process non-face objects at different categorization levels. This suggests the ventral visual pathway is not limited to faces but responds to perceptual task demands.
Area of Science:
- Neuroscience
- Cognitive Science
- Neuroimaging
Background:
- Functional neuroimaging implicates the ventral temporal lobe in face recognition.
- Previous studies often failed to distinguish object class from recognition level.
- A face-specific neural module hypothesis is debated.
Purpose of the Study:
- To investigate if brain areas involved in face recognition respond to non-face object categorization levels.
- To compare brain activation for subordinate-level versus basic-level recognition of non-face objects.
Main Methods:
- Used echo-planar functional magnetic resonance imaging (fMRI).
- Compared brain activation during matching of non-face objects.
- Manipulated recognition between basic and subordinate levels.
Main Results:
- Activation of the fusiform and inferior temporal gyri (FIT) and temporal poles occurred with subordinate-level non-face object recognition.
- These activated areas overlap with those previously linked to facial image processing.
Conclusions:
- Ventral visual pathway areas associated with face recognition are sensitive to non-face object categorization levels.
- This challenges the view that FIT is organized strictly by conceptual categories.
- Task requirements are crucial for evaluating 'neural module' hypotheses.