Line bisection in simulated homonymous hemianopia
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Homonymous hemianopia is a frequent visual field defect after injury of the postchiasmatic visual pathway. It has long been known that hemianopic patients make systematic errors during line bisection, placing bisection markers not in the centre of the line but biased instead toward their visual field defect. The cause for this contralesional bisection error is unknown. Various hypotheses attribute the error to the visual field defect, long-term strategic adaptation to the defect, or, more recently suggested, a consequence of extrastriate brain injury. To determine if bisection error can occur without the contribution of the latter two factors, we studied line bisection in healthy subjects with simulated homonymous hemianopia using a gaze-contingent display paradigm, with different line lengths and the presence or absence of line-end markers. We found that simulated homonymous hemianopia induced a line bisection error towards the simulated hemianopia, that this was associated with a significant bias of fixations toward the blind field, and that the effect was present with all line lengths but accentuated when line-end markers were present. In a second experiment we showed that the eccentric fixation alone, without a simulated hemianopia, is sufficient to produce a similar bisection error, with or without line-end markers. Our results indicate that a homonymous visual field defect alone is sufficient to induce a line bisection error and previously described alterations in fixation distribution, and does not require long-term adaptation or extrastriate pathology.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it