Cited by 50Visual perception and processing mechanismsSchizophrenia research and treatmentNeuroscience and Neuropharmacology Research

Broader visual orientation tuning in patients with schizophrenia

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Rokem, Ariel, Yoon, Jong H., Ooms, Renata E., Maddock, Richard J., Minzenberg, Michael J., Silver, Michael A.·2011·Frontiers in Human Neuroscience

Abstract

Reduced gamma-aminobutyric acid (GABA) levels in cerebral cortex are thought to contribute to information processing deficits in patients with schizophrenia (SZ), and we have previously reported lower in vivo GABA levels in the visual cortex of patients with SZ. GABA-mediated inhibition plays a role in sharpening orientation tuning of visual cortical neurons. Therefore, we predicted that tuning for visual stimulus orientation would be wider in SZ. We measured orientation tuning with a psychophysical procedure in which subjects performed a target detection task of a low-contrast oriented grating, following adaptation to a high-contrast grating. Contrast detection thresholds were determined for a range of adapter-target orientation offsets. For both SZ and healthy controls, contrast thresholds decreased as orientation offset increased, suggesting that this tuning curve reflects the selectivity of visual cortical neurons for stimulus orientation. After accounting for generalized deficits in task performance in SZ, there was no difference between patients and controls for detection of target stimuli having either the same orientation as the adapter or orientations far from the adapter. However, patients' thresholds were significantly higher for intermediate adapter-target offsets. In addition, the mean width parameter of a Gaussian fit to the psychophysical orientation tuning curves was significantly larger for the patient group. We also present preliminary data relating visual cortical GABA levels, as measured with magnetic resonance spectroscopy, and orientation tuning width. These results suggest that our finding of broader orientation tuning in SZ may be due to diminished visual cortical GABA levels.

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Authors
Rokem, A., Yoon, J. H., Ooms, R. E., Maddock, R. J., Minzenberg, M. J., & Silver, M. A.
Affiliations
  • University of California, Berkeley (US)
  • University of California, Davis (US)
Corresponding author
Rokem, Ariel
Venue
Frontiers in Human Neuroscience
Published
2011
Volume
5
Pages
127-127
ISSN
1662-5161 (ISSN-L)
OpenAlex
W2159031323
Cited by
50
References
59
Citations by year
2025: 1 · 2024: 6 · 2023: 2 · 2022: 4 · 2021: 2 · 2020: 4 · 2019: 6 · 2018: 3 · 2017: 3 · 2016: 3 · 2015: 4 · 2014: 1 · 2013: 9 · 2012: 2
FWCI
1.95
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Human Neuroscience (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • eScholarship (California Digital Library) (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
schizophrenia, orientation tuning, visual cortex, GABA, cortical inhibition, contrast detection, orientation adaptation, magnetic resonance spectroscopy

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