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Title: Distinct causal influences of dorsolateral prefrontal cortex and posterior parietal cortex in multiple-option decision making
Authors: Woo, TF 
Law, CK 
Ting, KH 
Chan, CC
Kolling, N
Watanabe, K
Chau, BK 
Issue Date: 1-Apr-2022
Source: Cerebral cortex, 1 Apr. 2022, v. 32, no. 7, p. 1390-1404
Abstract: Our knowledge about neural mechanisms underlying decision making is largely based on experiments that involved few options. However, it is more common in daily life to choose between many options, in which processing choice information selectively is particularly important. The current study examined whether the dorsolateral prefrontal cortex (dlPFC) and posterior parietal cortex (PPC) are of particular importance to multiple-option decision making. Sixty-eight participants received anodal high definition-transcranial direct current stimulation (HD-tDCS) to focally enhance dlPFC or PPC in a double-blind sham-controlled design. Participants then performed a multiple-option decision making task. We found longer fixations on poorer options were related to less optimal decisions. Interestingly, this negative impact was attenuated after applying anodal HD-tDCS over dlPFC, especially in choices with many options. This suggests that dlPFC has a causal role in filtering choice-irrelevant information. In contrast, these effects were absent after participants received anodal HD-tDCS over PPC. Instead, the choices made by these participants were more biased towards the best options presented on the side contralateral to the stimulation. This suggests PPC has a causal role in value-based spatial selection. To conclude, the dlPFC has a role in filtering undesirable options, whereas the PPC emphasizes the desirable contralateral options.
Keywords: Decision making
Dorsolateral prefrontal cortex
Multiple option
Noninvasive brain stimulation
Parietal cortex
Publisher: Oxford University Press
Journal: Cerebral cortex 
ISSN: 1047-3211
EISSN: 1460-2199
DOI: 10.1093/cercor/bhab278
Rights: © The Author(s) 2021. Published by Oxford University Press. All rights reserved.
This is a pre-copyedited, author-produced PDF of an article accepted for publication in Cerebral Cortex following peer review. The version of record Tsz-Fung Woo, Chun-Kit Law, Kin-Hung Ting, Chetwyn C H Chan, Nils Kolling, Kei Watanabe, Bolton K H Chau, Distinct Causal Influences of Dorsolateral Prefrontal Cortex and Posterior Parietal Cortex in Multiple-Option Decision Making, Cerebral Cortex, Volume 32, Issue 7, 1 April 2022, Pages 1390–1404 is available online at:
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