10.5061/DRYAD.46QM6
Bronfman, Zohar Z.
Tel Aviv University
Brezis, Noam
Tel Aviv University
Usher, Marius
Tel Aviv University
Data from: Non-monotonic temporal-weighting indicates a dynamically
modulated evidence-integration mechanism
Dryad
dataset
2016
perceptual decision making
temporal weights
dynamic LCA
primacy
recency
2016-11-25T00:00:00Z
2016-11-25T00:00:00Z
en
https://doi.org/10.1371/journal.pcbi.1004667
12469003 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Perceptual decisions are thought to be mediated by a mechanism of
sequential sampling and integration of noisy evidence whose temporal
weighting profile affects the decision quality. To examine temporal
weighting, participants were presented with two brightness-fluctuating
disks for 1, 2 or 3 seconds and were requested to choose the overall
brighter disk at the end of each trial. By employing a signal-perturbation
method, which deploys across trials a set of systematically controlled
temporal dispersions of the same overall signal, we were able to quantify
the participants’ temporal weighting profile. Results indicate that, for
intervals of 1 or 2 sec, participants exhibit a primacy-bias. However, for
longer stimuli (3-sec) the temporal weighting profile is non-monotonic,
with concurrent primacy and recency, which is inconsistent with the
predictions of previously suggested computational models of perceptual
decision-making (drift-diffusion and Ornstein-Uhlenbeck processes). We
propose a novel, dynamic variant of the leaky-competing accumulator model
as a potential account for this finding, and we discuss potential neural
mechanisms.
AllData_Exp1Behavioral data Exp.1 in .mat
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