Electrical brain stimulation of the fusiform gyrus using ECoG alters face perception;

Question

BlackTom AI · Accepted Answer

Face-selective regions of the fusiform gyrus (the fusiform face area, FFA) are specialized for processing facial identity and features, so direct electrical stimulation there is most likely to alter face perception.

1) Relevant knowledge points and concepts
- The fusiform gyrus contains patches of cortex that respond preferentially to faces (face-selective sites) as measured by fMRI or intracranial recordings (ECoG high-frequency activity).
- Electrical cortical stimulation perturbs local neural populations; behavioral effects emerge when the stimulated population contributes causally to the behavior.
- ECoG allows focal stimulation and simultaneous recording; comparisons across sites reveal whether stimulation effects correlate with local face-selectivity.

2) Step-by-step reasoning
- Identify electrodes/sites with strong face-selective responses (e.g., higher activation to faces than to non-face objects).
- Apply focal ECoG stimulation to individual sites while subjects view faces.
- Observe whether face perception is altered (distortions, face parts misperceived, transient prosopagnosia-like effects).
- Compare results across sites: stimulation of highly face-selective sites produces perceptual changes; stimulation of non-face-selective sites does not.

3) Intermediate “calculation”/evidence steps
- Measure selectivity index SI = (Response_faces − Response_nonfaces) / (Response_faces + Response_nonfaces).
- Sites with high SI show perceptual disruption upon stimulation; low-SI sites show no effect. (This is the empirical logic linking selectivity score to behavioral effect.)

4) Why the correct answer is correct
- Because only those cortical patches that encode face information will, when perturbed, change face perception. The causal link is established by the correlation between site selectivity and stimulation-induced perceptual changes.

5) Why other options are incorrect
- Stimulating arbitrary fusiform locations or non-face-selective sites will not reliably alter face perception because those sites do not represent face-specific information.
- Stimulating other sensory or motor regions would produce different effects unrelated to face perception.

6) Conclusion
- Therefore, electrical brain stimulation of the fusiform gyrus using ECoG alters face perception in brain locations that are more face-selective, which matches the provided answer.

Electrical brain stimulation of the fusiform gyrus using ECoG alters face perception;单项选择题

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