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Depression and trail making test scores in a sample of cocaine abusers
Arthur MacNeill Horton1, Charles Roberts
1Center for Substance Abuse Treatment, Substance Abuse and Mental Health Services Administration, Rockville, Maryland, USA. drmachorton@hotmail.com
The International Journal of Neuroscience
|July 15, 2003
Summary
Depression minimally impacts cognitive screening using the Trail Making Test (TMT) in cocaine abusers. While some TMT scores showed slight sensitivity, overall effects were small in this large treatment study.
Area of Science:
- Neuroscience
- Psychiatry
- Psychology
Background:
- Cognitive impairments are common in substance use disorders.
- The Trail Making Test (TMT) is a widely used neuropsychological tool for assessing cognitive function.
- Understanding depression's impact on TMT performance is crucial for accurate assessment in clinical populations.
Purpose of the Study:
- To investigate the effects of depression on various Trail Making Test (TMT) scores in individuals undergoing treatment for cocaine abuse.
- To determine which TMT metrics are most and least sensitive to depressive symptoms in this population.
Main Methods:
- Analysis of data from 4299 subjects in the Drug Abuse Treatment Outcome Study (DATOS), a large-scale, prospective cohort study (1991-1993).
- Examined effects of depression on TMT Part A, Part B, and derived scores (sum, difference, product, quotient).
- Controlled for demographic variables including sex, age, ethnicity, and education.
Main Results:
- Depression exhibited minimal effects on TMT Part A and the difference score.
- All tested TMT metrics demonstrated small R-squared values, indicating limited explanatory power of depression.
- The study identified specific TMT scores with lower sensitivity to depressive symptoms in cocaine abusers.
Conclusions:
- The Trail Making Test (TMT) appears relatively robust to depressive symptoms in cocaine-abusing individuals undergoing treatment.
- Clinicians should be aware that depression may have a limited, though not entirely absent, impact on TMT performance in this population.
- Further research may explore other cognitive domains or refine TMT interpretation for individuals with co-occurring depression and substance use disorders.