Universität zu Köln

Bode, Stefan ORCID: 0000-0002-0258-7795, Bennett, Daniel, Sewell, David K., Paton, Bryan, Egan, Gary F., Smith, Philip L. and Murawski, Carsten ORCID: 0000-0002-1237-9535 (2018). Dissociating neural variability related to stimulus quality and response times in perceptual decision-making. Neuropsychologia, 111. S. 190 - 201. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1873-3514

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Abstract

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 with increased activation in bilateral medial occipito-temporal cortex and ventral striatum. Lower stimulus quality was related to stronger activation in posterior parietal cortex (PPC) and dorsolateral prefrontal cortex (DLPFC). When stimulus quality was fixed, faster response times were associated with a positive parametric modulation of activation in medial prefrontal and orbitofrontal cortex, while slower response times were again related to more activation in PPC, DLPFC and insula. Our results suggest that distinct neural networks were sensitive to the quality of stimulus information, and to trial-to-trial variability in the encoded stimulus representations, but that reaching a decision was a consequence of their joint activity.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bode, Stefan UNSPECIFIED orcid.org/0000-0002-0258-7795 UNSPECIFIED Bennett, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Sewell, David K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Paton, Bryan UNSPECIFIED UNSPECIFIED UNSPECIFIED Egan, Gary F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smith, Philip L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Murawski, Carsten UNSPECIFIED orcid.org/0000-0002-1237-9535 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-194009
DOI:	10.1016/j.neuropsychologia.2018.01.040
Journal or Publication Title:	Neuropsychologia
Volume:	111
Page Range:	S. 190 - 201
Date:	2018
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1873-3514
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DORSOLATERAL PREFRONTAL CORTEX; LATERAL INTRAPARIETAL AREA; SEQUENTIAL SAMPLING MODELS; HUMAN BRAIN; EVIDENCE ACCUMULATION; PARIETAL CORTEX; ORBITOFRONTAL CORTEX; BEHAVIORAL CHOICE; DIFFUSION-MODEL; VISUAL-CORTEX Multiple languages Behavioral Sciences; Neurosciences; Psychology, Experimental Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19400