Increased experience amplifies the activation of task-irrelevant category representations

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Perception

Background:

• Prior knowledge influences visual search, offering benefits like task-relevant selection and costs such as task-irrelevant attentional capture.
• Experience with specific categories can modulate how item and category representations are activated during search tasks.
• Dieting experience, encompassing Disinhibition, Restraint, and Hunger, serves as a model for studying category-specific knowledge.

Purpose of the Study:

• To investigate if varying levels of dieting experience predict task-relevant and task-irrelevant activation of item and category representations during visual search.
• To examine how experience influences attentional selection and capture when searching for specific food items or food categories.

Main Methods:

• Adults with diverse dieting experience (Disinhibition, Restraint, Hunger) performed visual search tasks for specific food items or categories.
• Target-absent 'foil' trials presented irrelevant items from the target's category to assess attentional capture.
• Event-related potentials (ERPs), specifically the N2pc component, were used to measure the activation of task-relevant and task-irrelevant representations.

Main Results:

• Activation of task-relevant representations (Exemplar and Category N2pc amplitudes) did not vary with dieting experience levels.
• Increased dieting experience, indicated by lower Disinhibition scores, predicted enhanced activation of task-irrelevant representations.
• This suggests greater attentional capture by irrelevant items belonging to the target's category in more experienced individuals.

Conclusions:

• Greater experience with specific categories promotes rapid activation of category representations, even when this information is task-irrelevant.
• The N2pc component in foil trials may serve as a neural marker for an individual's level of experience with particular categories.
• Findings highlight the dual role of prior knowledge in attentional processes, with experience influencing automatic activation and potential capture.