Intact visual word priming in cocaine dependent subjects with and without cognitive deficit

Area of Science:

• Cognitive Neuroscience
• Neurobiology of Addiction

Background:

• Substance use disorders, particularly cocaine dependence, are associated with significant cognitive deficits.
• The impact of cocaine dependence on implicit versus explicit cognitive systems remains an area of active research.

Purpose of the Study:

• To investigate the effects of semantic and repetition priming on reaction time in individuals with recent cocaine abstinence.
• To compare priming effects between cognitively intact and impaired cocaine-dependent groups and healthy controls.

Main Methods:

• Assessed reaction times to semantic and repetition priming tasks in 27 abstinent cocaine-dependent volunteers and 12 controls.
• Subdivided cocaine-dependent participants into cognitively intact (N=13) and impaired (N=14) groups based on neuropsychological testing.

Main Results:

• Both cocaine-dependent groups (intact and impaired) demonstrated motor-response facilitation from semantic and repetition priming.
• Priming effects in cocaine-dependent groups were not significantly different from those observed in non-abusing controls.

Conclusions:

• Implicit cognitive processes, including semantic and visual word priming, appear resilient to the neurotoxic effects of cocaine dependence.
• These findings suggest that cocaine dependence primarily impacts explicit cognitive systems, leaving implicit functions largely intact.