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Automatic and Controlled Semantic Retrieval: TMS Reveals Distinct Contributions of Posterior Middle Temporal Gyrus and Angular Gyrus

Thompson, H, Davey, J, Cornelissen, PL, Sonkusare, S, Hallam, G, Smallwood, J and Jefferies, E (2015) Automatic and Controlled Semantic Retrieval: TMS Reveals Distinct Contributions of Posterior Middle Temporal Gyrus and Angular Gyrus Journal of Neuroscience, 35 (46). pp. 15230-15239.

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Abstract

Semantic retrieval involves both (1) automatic spreading activation between highly related concepts and (2) executive control processes that tailor this activation to suit the current context or goals. Two structures in left temporoparietal cortex, angular gyrus (AG) and posterior middle temporal gyrus (pMTG), are thought to be crucial to semantic retrieval and are often recruited together during semantic tasks; however, they show strikingly different patterns of functional connectivity at rest (coupling with the “default mode network” and “frontoparietal control system,” respectively). Here, transcranial magnetic stimulation (TMS) was used to establish a causal yet dissociable role for these sites in semantic cognition in human volunteers. TMS to AG disrupted thematic judgments particularly when the link between probe and target was strong (e.g., a picture of an Alsatian with a bone), and impaired the identification of objects at a specific but not a superordinate level (for the verbal label “Alsatian” not “animal”). In contrast, TMS to pMTG disrupted thematic judgments for weak but not strong associations (e.g., a picture of an Alsatian with razor wire), and impaired identity matching for both superordinate and specific-level labels. Thus, stimulation to AG interfered with the automatic retrieval of specific concepts from the semantic store while stimulation of pMTG impaired semantic cognition when there was a requirement to flexibly shape conceptual activation in line with the task requirements. These results demonstrate that AG and pMTG make a dissociable contribution to automatic and controlled aspects of semantic retrieval.

Item Type: Article
Subjects : Psychology
Divisions : Faculty of Health and Medical Sciences > School of Psychology
Authors :
NameEmailORCID
Thompson, HUNSPECIFIEDUNSPECIFIED
Davey, JUNSPECIFIEDUNSPECIFIED
Cornelissen, PLUNSPECIFIEDUNSPECIFIED
Sonkusare, SUNSPECIFIEDUNSPECIFIED
Hallam, GUNSPECIFIEDUNSPECIFIED
Smallwood, JUNSPECIFIEDUNSPECIFIED
Jefferies, EUNSPECIFIEDUNSPECIFIED
Date : 18 November 2015
Identification Number : 10.1523/JNEUROSCI.4705-14.2015
Copyright Disclaimer : Copyright © 2015 Davey et al.
Uncontrolled Keywords : Angular gyrus, Control, Posterior middle temporal gyrus stimulation, Semantic, Transcranial magnetic
Depositing User : Symplectic Elements
Date Deposited : 04 Nov 2016 09:07
Last Modified : 31 Oct 2017 18:53
URI: http://epubs.surrey.ac.uk/id/eprint/812737

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