FC02-05 - Grasping behavior in schizophrenia suggests selective impairment in the dorsal visual pathway
Bibliographic record
Abstract
Introduction This study frames anomalous functional brain organization among persons with Schizophrenia (SCZ) within an evolutionary model of brain development, the Dual Trends Theory (DTT). The DTT argues that neural architecture develops along two separate pathways: the dorsal’archicortical’ trend and the ventral’paleocortical’ trend. The DTT dovetails with visual system organization, which is also comprised of two independent pathways: a visuomotor dedicated dorsal stream and a perceptual dedicated ventral stream. Objectives The present study examined the integrity of these pathways using a size-contrast visual illusion. Prior research has shown that, normally, perceptual estimations of object size are susceptible to visual illusions, whereas goal-directed actions are resistant. We hypothesized that, unlike control participants, SCZ patients’ goal-directed actions would be susceptible to the illusion, reflecting selective dorsal stream dysfunction. Methods/results Here, 42 SCZ patients and 42 healthy control participants grasped and estimated the size of target blocks in both control and illusion conditions. Movement kinematics were measured using a magnetic motion trracking system (Flock of Birds). During estimation, both groups were equally perturbed by the illusion; however, grasping movements of patients alone were influenced by the illusion. Conclusions These results suggest disrupted dorsal brain circuitry in SCZ but relatively intact ventral brain circuitry.
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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 | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.000 |
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".