Arthur Prat-Carrabin

Oct 22, 2024 | biorxiv.org | Arthur Prat-Carrabin |Samuel J. Gershman

AbstractA classic result of psychophysics is that human perceptual estimates are more variable for larger magnitudes. This 'Weber behavior' has typically not been the focus of the prominent Bayesian paradigm, which models human perception as an optimal statistical inference conducted on the basis of noisy internal signals. Here we examine the variability of the estimates of a Bayesian observer, in comparison with human subjects.

Oct 1, 2024 | biorxiv.org | Arthur Prat-Carrabin |Michael Woodford

AbstractPrimacy and recency effects - wherein early and recent observations exert disproportionate influence on judgments - have long been noted in cognitive tasks involving the sequential presentation of information. In studies where human subjects make decisions based on the average of a sequence of numbers, recency effects are typically modeled phenomenologically through exponential discounting, while primacy effects are neglected altogether.

Mar 18, 2024 | biorxiv.org | Arthur Prat-Carrabin |Michael Woodford

AbstractThe behavioral variability in psychophysical experiments and the stochasticity of sensory neurons have revealed the inherent imprecision in the brain's representations of environmental variables. Numerosity studies yield similar results, pointing to an imprecise 'number sense' in the brain.