Representations in working memory yield interference effects found with externally-triggered representations

An act as simple as flicking a switch involves various stages of processing. Each stage is susceptible to interference from competing representations/processes. Interference at different stages of processing (e.g., perceptual stages versus response selection stages) leads to distinct behavioral, neural, and subjective effects. In the flanker task, for instance, one responds to a visual target and disregards flanking ‘distractors.’ Theoretically-predicted interference (increased response times, error rates, and subjective ‘urges to err’) is stronger when distractors and targets are associated with different actions (response interference) than when they look different but are associated with the same action (perceptual interference). Extant versions of the task tax working memory (WM) minimally, but many everyday actions (e.g., searching for keys or holding one's breath) require more WM-based control. To illuminate this uncharted area, we examined the nature of interference in delayed action tasks, which rely on WM. We found that systematic interference arises even when action-related representations are, not triggered solely by external stimuli, but actively held in WM. We discuss these findings with increased emphasis on the under-explored subjective effects of different kinds of interference. The implications of these findings for the study of action production, WM, and conscious processing are entertained.