Bibliographic record
Abstract
Posterior cortical atrophy (PCA) is a dementing syndrome that presents with signs and symptoms of cortical visual dysfunction.1 The clinical features of PCA reflect dysfunction mainly of the dorsal/occipito-parietal pathway causing Balint syndrome (simultanagnosia, optic ataxia, and ocular apraxia), transcortical sensory aphasia, apraxia, and some or all elements of Gerstmann syndrome (agraphia, acalculia, finger agnosia, right-left disorientation).1,2 Formal neuropsychological testing has confirmed a relative greater impairment of dorsal visual stream function while frontal lobe functions and memory are relatively preserved until later in the course of the disease.2 Structural and functional neuroimaging has consistently revealed atrophy or metabolic changes in the posterior regions of the brain.3 Although PCA is a clinically homogeneous syndrome, there is pathologic heterogeneity. Corticobasal degeneration, dementia with Lewy bodies, subcortical gliosis, fatal familial insomnia, and Creutzfeldt-Jacob disease have all been described as causing PCA.1,4 However, the most common reported pathologic cause is Alzheimer disease (AD) with increased density of neurofibrillary …
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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 | 0.002 |
| 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 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.004 | 0.003 |
| Insufficient payload (model declined to judge) | 0.007 | 0.002 |
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".