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Nicotine-induced activation of caudate and anterior cingulate cortex in response to errors in schizophrenia

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Abstract

Background

Nicotine improves attention and processing speed in individuals with schizophrenia. Few studies have investigated the effects of nicotine on cognitive control. Prior functional magnetic resonance imaging (fMRI) research demonstrates blunted activation of dorsal anterior cingulate cortex (dACC) and rostral anterior cingulate cortex (rACC) in response to error and decreased post-error slowing in schizophrenia.

Methods

Participants with schizophrenia (n = 13) and healthy controls (n = 12) participated in a randomized, placebo-controlled, crossover study of the effects of transdermal nicotine on cognitive control. For each drug condition, participants underwent fMRI while performing the stop signal task where participants attempt to inhibit prepotent responses to “go (motor activation)” signals when an occasional “stop (motor inhibition)” signal appears. Error processing was evaluated by comparing “stop error” trials (failed response inhibition) to “go” trials. Resting-state fMRI data were collected prior to the task.

Results

Participants with schizophrenia had increased nicotine-induced activation of right caudate in response to errors compared to controls (DRUG × GROUP effect: p corrected < 0.05). Both groups had significant nicotine-induced activation of dACC and rACC in response to errors. Using right caudate activation to errors as a seed for resting-state functional connectivity analysis, relative to controls, participants with schizophrenia had significantly decreased connectivity between the right caudate and dACC/bilateral dorsolateral prefrontal cortices.

Conclusions

In sum, we replicated prior findings of decreased post-error slowing in schizophrenia and found that nicotine was associated with more adaptive (i.e., increased) post-error reaction time (RT). This proof-of-concept pilot study suggests a role for nicotinic agents in targeting cognitive control deficits in schizophrenia.

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Correspondence to Lauren V. Moran.

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Conflict of interest

Over the past 3 years, Dr. Pizzagalli has received consulting fees from Akili Interactive Labs, BlackThorn Therapeutics, Boehringer Ingelheim, Pfizer, and Posit Science for activities unrelated to the current study. Dr. Evins has received research grant awards to her institution from Pfizer, Forum Pharmaceuticals, and GlaxoSmithKline and has received consulting fees from Pfizer and Reckitt Benckiser. All other authors declare that they have no conflicts of interest.

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Moran, L.V., Stoeckel, L.E., Wang, K. et al. Nicotine-induced activation of caudate and anterior cingulate cortex in response to errors in schizophrenia. Psychopharmacology 235, 789–802 (2018). https://doi.org/10.1007/s00213-017-4794-3

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  • DOI: https://doi.org/10.1007/s00213-017-4794-3

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