The right anterior temporal lobe variant of prosopagnosia
Bibliographic record
Abstract
Background: Prosopagnosia following right anterior temporal lesions alone has rarely been described, though functional imaging has suggested that face processing involves regions like aIT, anterior to the core face processing network (the fusiform face area, FFA, occipital face area, OFA, and superior temporal sulcus, STS). Prior work has hypothesized that anterior temporal lesions could cause an associative or amnestic variant of prosopagnosia, though it has been questioned whether this can be independent of a multimodal semantic deficit for people. Objective: Our goal was to determine the type of face recognition deficit after lesions limited to the right anterior temporal lobe. Method: We evaluated face recognition, perception and imagery as well as semantic knowledge about people in two subjects with prosopagnosia following herpes encephalitis causing right temporal pole lesions, in whom fMRI confirmed the integrity of FFA, OFA, and STS. Results: Both subjects performed normally on nearly all tests of perception of facial configuration and features, discrimination of face gender, and face detection. Subject R-AT2 was mildly impaired in discriminating changes in identity when expression also varied, and vice versa, suggesting some difficulty with invariant representations. Subject R-AT3 had mild impairments in discriminating eye shape and mouth changes, but far less severe than in subjects with FFA/OFA damage. In contrast, both subjects had markedly impaired face imagery. Finally, both subjects performed well on identifying famous names and linking semantic data such as occupation to names, in contrast to another subject with bilateral anterior temporal lesions. Conclusion: The right anterior temporal variant of prosopagnosia is characterized by impaired access to facial memories with relatively preserved face perception and semantic knowledge about people, consistent with an amnestic or associative functional subtype of prosopagnosia.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".