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CANTAB explicit memory is less impaired in addicted schizophrenia patients
Stéphane Potvin1, Catherine Briand, Antoinette Prouteau
1Centre de recherche Fernand-Seguin, Hôpital Louis-H Lafontaine, 7331 rue Hochelaga, Montreal, Que., Canada H1N 3V2.
Brain and Cognition
|May 26, 2005
Summary
Schizophrenia patients with substance use disorders showed better cognitive function, specifically in motor speed and memory. This suggests substance abuse may alleviate cognitive deficits or that individuals with fewer deficits are more likely to develop substance abuse issues.
Area of Science:
- Neuroscience
- Psychiatry
- Addiction Medicine
Background:
- Dual diagnosis in schizophrenia, specifically co-occurring substance use disorders, presents complex challenges.
- Previous research indicates potential links between substance abuse and reduced negative symptoms or improved social skills in schizophrenia.
- Limited data exist on the cognitive profiles of schizophrenia patients with co-occurring substance use disorders.
Purpose of the Study:
- To investigate cognitive performance in schizophrenia patients with and without a co-occurring substance use disorder.
- To explore the relationship between substance abuse and cognitive impairments in schizophrenia.
Main Methods:
- Seventy-six schizophrenia outpatients (DSM-IV criteria) were assessed.
- Participants were categorized into two groups: those with (n=44) and without (n=32) a diagnosed substance use disorder.
- Cognitive functions, including motor speed and visuo-spatial explicit memory, were evaluated using the CANTAB (Cambridge Neuropsychological Test Automated Battery).
Main Results:
- Schizophrenia patients with a co-occurring substance use disorder demonstrated superior cognitive performance compared to those without.
- Specifically, dual diagnosis patients exhibited better motor speed and visuo-spatial explicit memory.
- These findings were consistent with the initial hypothesis regarding cognitive function.
Conclusions:
- The results indicate that dual diagnosis schizophrenia patients may experience less severe cognitive deficits.
- Two potential explanations are proposed: substance abuse might ameliorate schizophrenia-related cognitive impairments, or individuals with inherently better cognitive function may be more susceptible to developing substance abuse.
- Further research is warranted to elucidate the causal relationship and underlying mechanisms.