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Greater sensitivity of the cortical face processing system to perceptually-equated face detection
1McLean Hospital, Department of Psychiatry, Harvard Medical School, United States.
Brain Research
|November 24, 2015
Summary
The fusiform face area (FFA) and occipital face area (OFA) are crucial for detecting faces, even at low visibility. These brain regions selectively support initial face perception over other object detection.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Visual Perception
Background:
- Face detection is vital for social interaction but its neural basis remains unclear.
- The cortical face processing system, including FFA, OFA, and STS, is known for face perception but its role in detection is less understood.
Purpose of the Study:
- To investigate the specific roles of the FFA, OFA, and STS in the fundamental process of face detection.
- To isolate face detection from other face perception attributes and equate it perceptually across participants.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to measure brain activity in 20 participants.
- Activations in FFA, OFA, and STS were examined during isolated face detection and tree detection tasks.
- Psychophysical methods were employed to determine individual perceptual performance levels.
Main Results:
- FFA and OFA showed significant activation during face detection, even at perceptual thresholds.
- STS was not significantly activated during face detection.
- FFA and OFA responded to tree detection only with high-contrast stimuli, unlike during face detection.
- FFA activation during face detection correlated with individual perceptual performance.
Conclusions:
- FFA and OFA demonstrate heightened sensitivity to face detection signals.
- These areas selectively support the initial stage of distinguishing faces from non-face objects.
- The findings clarify the distinct roles of face-selective areas in perception.
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