Cited by 57Face Recognition and PerceptionCannabis and Cannabinoid ResearchAutism Spectrum Disorder Research

Variation in the human cannabinoid receptor CNR1 gene modulates gaze duration for happy faces

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Chakrabarti, Bhismadev, Baron-Cohen, Simon·2011·Molecular Autism

Abstract

BACKGROUND: From an early age, humans look longer at preferred stimuli and also typically look longer at facial expressions of emotion, particularly happy faces. Atypical gaze patterns towards social stimuli are common in autism spectrum conditions (ASC). However, it is unknown whether gaze fixation patterns have any genetic basis. In this study, we tested whether variations in the cannabinoid receptor 1 (CNR1) gene are associated with gaze duration towards happy faces. This gene was selected because CNR1 is a key component of the endocannabinoid system, which is involved in processing reward, and in our previous functional magnetic resonance imaging (fMRI) study, we found that variations in CNR1 modulate the striatal response to happy (but not disgust) faces. The striatum is involved in guiding gaze to rewarding aspects of a visual scene. We aimed to validate and extend this result in another sample using a different technique (gaze tracking). METHODS: A total of 30 volunteers (13 males and 17 females) from the general population observed dynamic emotional expressions on a screen while their eye movements were recorded. They were genotyped for the identical four single-nucleotide polymorphisms (SNPs) in the CNR1 gene tested in our earlier fMRI study. RESULTS: Two SNPs (rs806377 and rs806380) were associated with differential gaze duration for happy (but not disgust) faces. Importantly, the allelic groups associated with a greater striatal response to happy faces in the fMRI study were associated with longer gaze duration at happy faces. CONCLUSIONS: These results suggest that CNR1 variations modulate the striatal function that underlies the perception of signals of social reward, such as happy faces. This suggests that CNR1 is a key element in the molecular architecture of perception of certain basic emotions. This may have implications for understanding neurodevelopmental conditions marked by atypical eye contact and facial emotion processing, such as ASC.

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  1. Chakrabarti B Individual differences in human emotion perception: neuroimaging, genetic and behavioural investigations PhD thesis 2007 Department of Psychiatry, School of Clinical Medicine, University of Cambridge

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Authors
Chakrabarti, B., & Baron-Cohen, S.
Affiliations
University of Cambridge (GB)
Corresponding author
Chakrabarti, Bhismadev
Venue
Molecular Autism
Published
2011
Volume
2
Issue
1
Pages
10
ISSN
2040-2392 (ISSN-L)
OpenAlex
W2099870770
Cited by
57
References
56
Citations by year
2026: 1 · 2025: 3 · 2024: 3 · 2023: 3 · 2022: 5 · 2021: 7 · 2020: 3 · 2019: 1 · 2018: 6 · 2017: 5 · 2016: 5 · 2015: 3 · 2014: 1 · 2013: 6 · 2012: 5
FWCI
1.95
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Molecular Autism (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Nancy Lurie Marks Family Foundation
  • National Institute for Health and Care Research
  • University of Cambridge
  • Medical Research Council
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Face Recognition and Perception
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
Keywords
CNR1 gene, CB1 receptor, single nucleotide polymorphisms, gaze duration, happy faces, emotional face processing, endocannabinoid system, striatum, social reward, autism spectrum disorder, eye contact, genetic variation

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