Overshadowing and salience attribution in relation to cannabis use

Journal article


Dawnes, C., McGreal, S. J., Marwaha, S., Prados, J., Reheis, A., Dumitrescu, A., Waddington, J. L., Moran, P. M. and O'Tuathaigh, C. 2024. Overshadowing and salience attribution in relation to cannabis use. Schizophrenia Research: Cognition. 37, pp. 1-9. https://doi.org/10.1016/j.scog.2024.100315
AuthorsDawnes, C., McGreal, S. J., Marwaha, S., Prados, J., Reheis, A., Dumitrescu, A., Waddington, J. L., Moran, P. M. and O'Tuathaigh, C.
Abstract

Aberrant attentional salience has been implicated in the cannabis-psychosis association. Here, history and frequency of cannabis use were examined against changes in overshadowing (OS), a cue competition paradigm that involves salience processing. Additionally, we examined the association between OS and alternative measures of aberrant salience, as well as schizotypy, in a non-clinical adult sample.

280 participants completed an online geometry learning-based OS task, while a subset (N = 149) also completed the Salience Attribution Task (SAT) measure of aberrant salience. All completed the Schizotypal Personality Questionnaire (SPQ), Aberrant Salience Inventory (ASI), and the modified Cannabis Experience Questionnaire (CEQmv). Differences across OS and SAT performance stages and between cannabis use groups were assessed using mixed ANOVAs. Multiple regression and correlational analyses assessed the relationships between OS and SAT task metrics and SPQ and ASI subscale scores.

Current cannabis users had significantly lower OS scores during the testing phase relative to those who do not use cannabis, at medium effect sizes. Schizotypy or ASI scores did not mediate this relationship. In the SAT, current cannabis users presented significantly higher implicit aberrant salience relative to non-users. Scores in the first training phase of the OS task significantly predicted higher explicit aberrant and adaptive salience scores in the SAT.

These data indicate an association between regular cannabis use and abnormalities in cue competition effects in a healthy adult sample. Comparisons of OS and SAT cast new light on putative overlapping mechanisms underlying performance across different measures of salience.

KeywordsCannabis; Overshadowing; Aberrant salience
Year2024
JournalSchizophrenia Research: Cognition
Journal citation37, pp. 1-9
PublisherElsevier
ISSN2215-0013
Digital Object Identifier (DOI)https://doi.org/10.1016/j.scog.2024.100315
Web address (URL)https://doi.org/10.1016/j.scog.2024.100315
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Open
Output statusPublished
Publication dates
Online10 May 2024
Publication process dates
Deposited22 May 2024
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