Executive functioning moderates the decline of retrieval fluency in time

Area of Science:

• Cognitive Psychology
• Neuroscience
• Linguistics

Background:

• Theoretical accounts suggest uniform engagement of automatic and controlled processes in semantic verbal fluency (SVF) tasks.
• An alternative proposal posits a shift from rapid automatic retrieval to slower, executive-demanding retrieval over time.

Purpose of the Study:

• To investigate the dynamic interplay of automatic and controlled processes during SVF task performance.
• To examine how task demand and individual differences in executive function influence semantic retrieval dynamics.

Main Methods:

• Eighty-five healthy adults performed low- and high-demand SVF tasks.
• Measures included retrieval rate, response typicality, inter-response similarity, and executive functioning.
• Analysis focused on time-dependent changes in retrieval and their relation to executive control and working memory.

Main Results:

• Decreased fluency over time correlated with lower response typicality and weaker semantic similarity.
• Time-dependent retrieval slowing was more pronounced in individuals with poorer interference control, particularly in high-demand tasks.
• Steeper retrieval slowing was associated with reduced working memory capacity.

Conclusions:

• The relative contribution of automatic and controlled semantic retrieval shifts with associative sparsity and task demands.
• Findings challenge uniform process engagement models and highlight the dynamic nature of semantic retrieval.
• SVF tasks' sensitivity to executive control has implications for clinical assessments of cognitive function.