The fusiform face area subserves face perception, not generic within-category identification.

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Visual Perception

Background:

• The precise function of the fusiform face area (FFA), a specialized region in the human brain, remains under investigation.
• Understanding the FFA's role is key to comprehending visual processing and object recognition.

Purpose of the Study:

• To investigate the role of the fusiform face area (FFA) in the detection and within-category identification of faces and objects.
• To correlate functional magnetic resonance imaging (fMRI) activity in the FFA with behavioral performance in perceptual tasks.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
• Participants engaged in perceptual tasks involving the detection and identification of faces and non-face objects.
• FFA activation was analyzed in relation to behavioral outcomes on a trial-by-trial basis.

Main Results:

• FFA activation significantly correlated with both the detection of faces and the identification of specific faces.
• For most non-face objects, including those of expertise (e.g., cars for car experts), within-category identification performance correlated with activation in the ventral occipitotemporal cortex, not the FFA.
• The FFA demonstrated a specific role in face processing, distinct from general object recognition.

Conclusions:

• The FFA is critically involved in both the detection and identification of faces.
• The FFA's role in within-category identification is largely specific to faces, with limited involvement in non-face objects, even for experts.
• These findings clarify the specialized function of the FFA within the broader visual processing network.