The Man Who Could Only See Faces in Pieces
A stroke left a patient able to describe every feature of a face — the nose, the eyes, the mouth — yet unable to assemble them into a person he recognized. His case forced scientists to realize the brain builds a whole face as a single unit, not a sum of parts. The story reveals how much of perception happens invisibly, before we're ever aware of it.
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Prosopagnosia prevents the brain from bridging the gap between seeing facial features and recognizing identity.
Patients often identify loved ones by tracking their gait, shoulder posture, or voice pitch instead of faces.
Holistic perception relies on the brain calculating precise spatial distances between eyes, noses, and lips.
The ventral stream handles identity while the dorsal stream tracks dynamic cues like smiles and expressions.
Damage to the Fusiform Face Area can cause a patient to see their own reflection as a stranger.
Recognition is an active biological construction rather than a passive recording of the visual world.
- 01Intro1 min
- 02The Fractured Mirror2 min
- 03Parts Without a Whole3 min
- 04The Geography of Recognition2 min
- 05The Invisible Construction2 min
- 06Outro1 min
- Impaired Integration of Emotional Faces and Affective Body Context ...
- Holistic processing impairment can be restricted to faces in acquired prosopagnosia: evidence from the global/local Navon effect - PubMed
- Impaired holistic processing of unfamiliar individual faces in acquired prosopagnosia - PubMed
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- When family looks strange and strangers look normal: a case of impaired face perception and recognition after stroke - PubMed
- Prosopagnosia: face blindness and its association with ... - PMC
- [PDF] Evidence from an extensive case study of acquired prosopagnosia
- Behavioral and neural evidence for preserved holistic face detection in acquired prosopagnosia
- Prosopagnosia after stroke: potentials for impairment and ...
- Visual agnosia in the era of behavioral and neural investigations
- The stroke patient for whom strangers look normal while family looks strange | BPS
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- Seeing, since childhood, without ventral stream: a behavioural ...
- Face Processing in Developmental Prosopagnosia: Altered Neural ...
- The ventral stream receives spatial information from the dorsal stream during configural face processing
- A century of prosopometamorphopsia studies
- The Functional Architecture of the Face System: integrating Evidence from fMRI and Patient Studies
- Understanding face perception by means of prosopagnosia and neuroimaging
- [PDF] Spatial Integration in Normal Face Processing ... - Semantic Scholar
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