Questions: Face Processing Neural Systems and Perception

Question 1

A patient with damage to the right fusiform gyrus can recognize chairs, cars, and tools without difficulty but cannot recognize familiar faces — including their own family members' faces in photographs. What does this dissociation most strongly suggest?

• A. The right fusiform gyrus is the only region that processes visual information
• B. Face recognition relies on a partially specialized neural system within the ventral visual stream
• C. The patient's object recognition has been enhanced to compensate for impaired face processing
• D. The damage disrupted holistic processing, which is equally required for face and object recognition

Answer: (B)

The selective impairment of face recognition (prosopagnosia) with intact object recognition is a double dissociation that provides strong evidence for specialized face-processing machinery. If face and object recognition relied on identical neural substrates, focal damage could not impair one while sparing the other. The case does not suggest the fusiform is the only visual region (answer A is wrong) — it demonstrates that this region is specifically critical for face individuation.

Question 2

An fMRI study finds that expert bird-watchers show stronger fusiform gyrus activation for images of birds than non-experts do. What does this finding suggest about the FFA?

• A. The FFA is not specialized for faces — it responds equally to all visual categories
• B. The FFA reflects expertise in fine-grained individuation within any homogeneous category, not faces specifically
• C. Expert bird-watchers have lost their face-processing ability because birds have displaced faces in the FFA
• D. The finding confirms the domain-specificity view, since birds and faces share evolutionary significance

Answer: (B)

This finding supports the expertise account of FFA function: the fusiform region may be specialized for fine-grained individuation of objects within a category, and faces happen to be the category that nearly everyone develops intense individuation experience with. Bird experts individuate birds the way everyone individuates faces, and their FFA reflects this. The finding challenges strong domain-specificity but does not imply the FFA is undifferentiated (A) or that expert bird-watchers lose face processing (C).

Question 3

The face inversion effect — the dramatic impairment in face recognition when a face is turned upside down — is larger than the inversion effect for most other object categories.

• T. True
• F. False

Answer: True

The face inversion effect is one of the key pieces of evidence for holistic face processing: faces are processed as integrated wholes rather than as collections of independent features. When a face is inverted, holistic processing breaks down, impairing recognition far more than inversion disrupts recognition of other objects (which are processed more feature-by-feature to begin with). The larger inversion cost for faces compared to houses, cars, or scrambled stimuli supports the idea that the face system has a processing signature distinct from general object recognition.

Question 4

According to the Haxby-Hoffman-Gobbini model, the fusiform face area (FFA) is responsible for extracting the social and emotional meaning of faces.

• T. True
• F. False

Answer: False

In the Haxby model, the FFA is part of the 'core' system that handles visual analysis of faces — specifically facial identity. Extracting social and emotional meaning is the job of the 'extended' system: the amygdala processes emotional relevance and threat, and prefrontal regions handle intentional attribution and social inference. The pSTS in the core system handles dynamic facial information (gaze, expression, mouth movements), but the deeper meaning-making is downstream. The FFA is the visual recognition stage, not the social interpretation stage.

Question 5

Why do researchers debate whether the fusiform face area (FFA) is specifically 'for' faces versus being a general fine-grained individuation region, and what evidence bears on each side?

Model answer: The domain-specificity view holds that faces are evolutionarily privileged stimuli that shaped dedicated neural machinery, supported by prosopagnosia, the face inversion effect, holistic processing, and the other-race effect. The expertise view holds that the FFA reflects fine-grained individuation of any homogeneous category, supported by expert bird-watchers showing elevated FFA activity for birds. The most likely resolution is that the fusiform region is specialized for individuation, and faces are the category that universally receives intense individuation experience, making it appear face-specific across most study populations.

This debate illustrates a broader question about how the brain organizes high-level vision: is functional organization primarily innate and category-specific, or shaped by experience? The answer matters for understanding developmental prosopagnosia, autism (which affects face processing), and the plasticity of high-level visual cortex generally. Students who grasp that both views have evidence — and that the resolution may be 'individuation specialized by experience' — understand the subtlety of functional specialization.