14 March 2011

Our paper "Sequential Analysis of the Numerical Stroop Effect Reveals Response Suppression" has been accepted for publication in the Journal of Experimental Psychology: Learning, Memory, and Cognition. We used sequential analysis to dissociate perceptual repetition from response repetition of the relevant and irrelevant dimension. Our analyses of reaction times, error rates, and diffusion modelling revealed that the congruity effect is significantly reduced or even absent when the response sequence of the irrelevant dimension, rather than the numerical value or the physical size, is repeated. These results suggest that automatic activation of the irrelevant numerical information is suppressed at the response level. The current results shed light on the level of interaction between numerical magnitude and physical size, as well as the effect of variability of responses and stimuli on automatic processing.