External location inhibits the spatial association for luminance

This study explored luminance as magnitude stimulus to systematically investigate how the Simon effect influences the spatial associations of magnitude stimuli across tasks. The results showed that (1) the SNARC effect was absent in the magnitude stimuli across location , color and magnitude classification tasks and (2) the Simon effect was stable across these tasks. In addition, the SNARC effect and the Simon effect did not interact across these tasks. The results imply that the spatial associations of magnitude stimuli are inhibited by the magnitude stimuli locations when the location and magnitude information overlap.