Prosopagnosia (face blindness) is a distinctive cognitive deficit in corticobasal syndrome (CBS) that reflects the disproportionate involvement of inferior temporal cortex, particularly the fusiform face area and surrounding visual association areas. While classically associated with posterior cortical atrophy (PCA), prosopagnosia occurs in a significant subset of CBS patients, particularly those with right-hemispheric or bilateral cortical involvement[1].
| Region | Function | CBS Involvement |
|---|---|---|
| Fusiform Face Area (FFA) | Face perception | Primary target of atrophy |
| Occipitotemporal Gyrus | Object recognition | Often co-affected |
| Superior Temporal Sulcus | Face processing | Variable involvement |
| Amygdala | Emotional significance | Frequently spared |
| Anterior Temporal Lobe | Semantic knowledge | Progressive involvement |
Inability to recognize familiar faces
Compensatory strategies
Associated visual deficits
| Condition | Distinguishing Feature |
|---|---|
| Alzheimer's Disease | More prominent memory deficits early |
| Posterior Cortical Atrophy | More severe visual perception deficits |
| FTD (Right Temporal) | More severe semantic deficits |
| PSP | Less prominent face recognition deficits |
| Test | Description | Cutoff |
|---|---|---|
| Cambridge Face Memory Test (CFMT) | Standardized face recognition | <20/36 borderline |
| Benton Facial Recognition Test | Matching tasks | <33/54 abnormal |
| Famous Faces Test | Naming famous personalities | Context-dependent |
| Facenameassoc Test | Combined naming/association | Varies by protocol |
Voice-based recognition
Contextual cues
External aids
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