Dissociating neural variability related to stimulus quality and response times in perceptual decision-making
Stefan Bode, Daniel Bennett, David K Sewell, Bryan Paton, Gary F Egan, Philip L Smith, Carsten Murawski
Neuropsychologia | Elsevier | Published : 2018
According to sequential sampling models, perceptual decision-making is based on accumulation of noisy evidence towards a decision threshold. The speed with which a decision is reached is determined by both the quality of incoming sensory information and random trial-by-trial variability in the encoded stimulus representations. To investigate those decision dynamics at the neural level, participants made perceptual decisions while functional magnetic resonance imaging (fMRI) was conducted. On each trial, participants judged whether an image presented under conditions of high, medium, or low visual noise showed a piano or a chair. Higher stimulus quality (lower visual noise) was associated wit..View full abstract
Awarded by Australian Research Council
This work was supported by the University of Melbourne, the Melbourne Neuroscience Institute, the Monash Biomedical Imaging Centre (Monash University), and Australian Research Council Discovery Early Career Researcher Awards to S.B. (DE140100350) and D.K.S. (DE140100772), and an Australian Research Council Discovery Project Grant (DP140102970) to P.L.S. Funding sources had no role in study design, in collection, analysis and interpretation of data, in the writing of the report, and in the decision to submit the article for publication.