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Critical Review: Opposing influences of sensory and response history in larval zebrafish

Core contribution: Using fish-locked whole-field visual motion (sinusoidal gratings, random-dot motion) in freely swimming 5-7 dpf larvae, the authors report that the previous stimulus direction (S_n-1) has a negative (repulsive) effect while the previous response direction (R_n-1) has a positive (repetitive) effect on the current optomotor turn direction. Effects persist across variable inter-trial intervals (0-60 s), suggesting history biases survive tens of seconds without decay. A logistic regression confirms opposing coefficients; hierarchical modeling shows >90% of individual fish exhibit both effects independently.

Key quantitative findings Main paper: opposing sensory/response history in larval zebrafish:

The psychometric analysis shows response-conditioned curve separation of ~15%. Over the session (3-4 h), P(repeat) and P(incorrect) increase together (Spearman ρ=0.503, p<0.001), while sensitivity (σ) remains unchanged but lapse rates (λ, γ) rise significantly — consistent with response repetition overriding sensory evidence rather than sensory degradation. The deterministic 3-integrator model (fast attractive, slow repulsive, motor integrator τ≈900 s) predicts ~85% of correct and ~20% of incorrect trials, well above chance.

Strengths: Large sample sizes (160 fish/15,981 trials for gratings; 76 fish/7,416 for 100% dot motion; 121 fish for mixed coherence). Careful disentangling of stimulus vs response history using conditioning on "correct" trials. Multi-scale model ablation (full, ST sensory drive, LT sensory inhibition, LT motor drive) confirms that only the full model jointly captures all timescales. Data and code deposited (KonData DOI 10.48606/h5v2506p48g298zv), enhancing reproducibility. Apparent "lapses" are reframed as deterministic history effects — connecting to prior work showing trial-history biases generate apparent lapses in rodents History biases cause apparent lapses (Gupta et al.).

Weaknesses and blindspots: (1) Cross-validation of the deterministic model's parameter set was done heuristically (Ziegler-Nichols-like tuning) rather than by formal model selection with held-out data. (2) The reported σ discrepancy between model and data is acknowledged but not resolved. (3) Only visual whole-field motion tested; generality to other modalities or to adult zebrafish unknown. (4) No neural recordings or perturbations to causally test proposed substrates (torus longitudinalis, ARTR, thalamus). (5) The moderate correlation between S_n-1 and R_n-1 (ρ=0.34) introduces multicollinearity risk, which the authors address but do not fully eliminate. (6) As a preprint, it lacks peer review; novelty rests on being the first systematic history-bias dissection in freely swimming larval zebrafish, complementing head-fixed work.

Confidence: Moderate-high for behavioral effects (large N, bootstrapped CIs, hierarchical replication); moderate for the integrator model as a mechanism (deterministic fit without formal cross-validation, no causal neural test).

What would change the conclusion: A model variant lacking the motor integrator that still predicts incorrect-trial rates and increasing lapse rates as accurately as the full model would undermine the response-repetition account. Neural perturbation of candidate substrates (e.g., ARTR silencing) that eliminates repetition without affecting repulsion would also refine the mechanistic story.

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Review by Ashrit MangalwedhekarReview by Sydney HuntReview by Iacopo HachenReview by Armin Bahl

 BGPT Paper Review

Study Novelty

First systematic dissection of opposing sensory vs response history biases in freely swimming larval zebrafish; the multi-scale deterministic integrator model is novel for this system but conceptually builds on known history-bias phenomena in mammals.

Scientific Quality

Large samples, careful conditioning analyses, hierarchical modeling, and ablation studies are strong. Limitations: heuristic (not formally cross-validated) model tuning, acknowledged σ mismatch between model and data, and preprint status without peer review.

Study Generality

Findings are system-specific (larval zebrafish optomotor) but connect to conserved history-bias phenomena in mammals; cross-species and cross-modal generality remain untested.

Study Usefulness

Provides a quantitative framework and open data/code for behavioral modeling; reframes apparent lapses as deterministic history effects, useful for anyone analyzing trial-based behavior.

Study Reproducibility

All data, simulation code, and analysis scripts are deposited (KonData DOI 10.48606/h5v2506p48g298zv); methods are detailed. Heuristic parameter tuning may introduce some reproducibility uncertainty.

Explanatory Depth

Model integrates three timescales mechanistically; however, neural substrates remain speculative (torus longitudinalis, ARTR, thalamus) without causal perturbation.