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Semantic activation in LSD: evidence from picture naming

Family, N; Vinson, D; Vigliocco, G; Kaelen, M; Bolstridge, M; Nutt, DJ; Carhart-Harris, RL; (2016) Semantic activation in LSD: evidence from picture naming. Language, Cognition and Neuroscience , 31 (10) pp. 1320-1327. 10.1080/23273798.2016.1217030. Green open access

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Abstract

Lysergic acid diethylamide (LSD) is a classic psychedelic drug that alters cognition in a characteristic way. It has been suggested that psychedelics expand the breadth of cognition via actions on the central nervous system. Previous work has shown changes in semantic processing under psilocybin (a related psychedelic to LSD) that are consistent with an increased spread of semantic activation. The present study investigates this further using a picture-naming task and the psychedelic, LSD. Ten participants completed the task under placebo and LSD. Results revealed significant effects of LSD on accuracy and error correction that were consistent with an increased spread of semantic activation under LSD. These results are consistent with a generalised “entropic” effect on the mind. We suggest incorporating direct neuroimaging measures in future studies, and to employ more naturalistic measures of semantic processing that may enhance ecological validity.

Type: Article
Title: Semantic activation in LSD: evidence from picture naming
Open access status: An open access version is available from UCL Discovery
DOI: 10.1080/23273798.2016.1217030
Publisher version: http://doi.org/10.1080/23273798.2016.1217030
Language: English
Additional information: © 2016 Informa UK Limited, trading as Taylor & Francis Group. This is an Accepted Manuscript of an article published by Taylor & Francis in Language, Cognition and Neuroscience on 11 August 2016, available online: http://www.tandfonline.com/10.1080/23273798.2016.1217030
Keywords: Psychedelics, lysergic acid diethylamide, speech errors, production, psychopharmacology
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences > Experimental Psychology
URI: http://discovery.ucl.ac.uk/id/eprint/1508431
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