It is well known that human information processing comprises several distinct subprocesses-namely, the perceptual, central, and motor stage. In each stage, attention plays an important role. Specifically, a type of attention-perceptual attention-operates to detect and identify a sensory input. Following this, another class of attention-central attention-is involved in working memory encoding and response selection at the central stage. While perceptual attention and central attention are known to be separate, distinct processes, some researchers reported findings that loading central attention postponed the deployment of perceptual attention needed to perform a spatial configuration search. We tested whether a similar pattern of results would emerge when a different kind of search task is used. To do so, we had participants perform a visual-search task of searching for a feature conjunction target, taxing perceptual attention while they are engaged in central processes, such as working memory encoding and response selection. The results showed that perceptual processing of conjunction search stimuli could be carried out concurrently with central processes. These results suggest that the nature of the concurrent visual search process is a determinant responsible for the dynamic relationship between perceptual attention deployed for visual search and central attention needed for working memory encoding and response selection.
Keywords: Central attention; Perceptual attention; Response selection; Working memory encoding.