Aims: The issues explored in this study were whether a patient group of problem drinkers selectively attend to alcohol-related stimuli and the time course of any interference from alcohol-related stimuli in comparison with two control groups of non-problem drinkers.
Design: A 3 x 2 x 2 x 5 factorial design was used. Drinking group (low, high and problem) and word order (alcohol-neutral, neutral-alcohol) were between-participant factors, and word type (alcohol, neutral) and presentation block (1-5) were within participant factors.
Participants: Three groups were used, 20 participants from a local community alcohol Service (CAS) and 40 participants (student volunteers) in two control groups. The two control groups were differentiated as scoring high or low on the Alcohol Use Disorders Identification Test (AUDIT).
Measurements: A modified computerized Stroop colour naming test was used to measure response latencies. Anxiety was measured using the State-Trait Anxiety Inventory.
Findings: The CAS group showed significantly longer reaction times to respond to the colour of alcohol-related words than to neutral category words. Although the interference was smaller for the high AUDIT group it was significant. No significant interference was found in the low AUDIT group. There was no statistical evidence that the interference habituated in the three groups.
Conclusions: The present study showed it is possible to use a modified Stroop task as a measure of implicit processing of alcohol stimuli. Despite the fact that all participants were asked to ignore the words, they were unable to do so. Alcohol-related words produced more interference than neutral category words in a group of problem drinkers and a control group of high alcohol drinkers.
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