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Distinct human face representations in the perirhinal cortex and fusiform gyrus
Tetsuya Iidaka1, Tokiko Harada, Satoshi Eifuku
1Department of Psychiatry, Nagoya University, Graduate School of Medicine, Nagoya, Japan. iidaka@med.nagoya-u.ac.jp
Brain Research
|March 31, 2012
Summary
The perirhinal cortex (PRC) shows unique face representation, with frontal views activating it more than other angles. This differs from the fusiform gyrus, suggesting a distinct role in processing facial information.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Visual Perception
Background:
- Face representation is primarily processed in the temporal visual pathway.
- Monkey lesion studies suggest simple facial features are processed caudally, while integrated features are stored in the perirhinal cortex (PRC).
- Experimental evidence in humans is lacking to confirm the PRC's role in face recognition.
Purpose of the Study:
- To investigate if the perirhinal cortex (PRC) function in face recognition differs from conventional face-related areas in normal human subjects.
- To examine the role of facial viewing angles in activating the PRC during face recognition tasks.
- To compare brain activation patterns in the PRC and fusiform gyrus across different facial views.
Main Methods:
- Two functional magnetic resonance imaging (fMRI) experiments were conducted on normal human subjects.
- Experiment 1 involved learning facial identity-figure associations and subsequent recognition testing with varying face angles.
- Experiment 2 paired face angles with abstract figures, manipulating angle while keeping identity constant.
Main Results:
- Perirhinal cortex (PRC) activation varied significantly with facial angle, showing greater activation for frontal views in both experiments.
- Conventional face-related areas, such as the fusiform gyrus, exhibited consistent activation regardless of facial viewing angle.
- These findings indicate distinct functional roles for the PRC and fusiform gyrus in face representation.
Conclusions:
- The perirhinal cortex (PRC) demonstrates a unique pattern of face representation compared to the fusiform gyrus.
- Frontal facial views play a crucial role in activating face representation stored within the PRC.
- This study provides human evidence supporting the PRC's specialized function in integrating complex facial information.
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