This study demonstrates that the initial analysis of visual objects into features from different dimensions strongly constrains postperceptual processes of response selection. When a target that is associated with a response on the basis of one dimension is presented simultaneously with flankers that are associated with a response on the basis of another dimension, the response to the target is not affected by the identity of the flankers. Experiments 1 and 2 show that this finding holds under a variety of conditions. The identity of the fiankers affects the response to the target when all stimuli are associated with a response on the basis of the same dimension (Experiment 3), even when the target and flankers are clearly dissimilar (Experiment 4), or belong to different semantic categories (Experiment 5). A model of response selection is proposed to account for these findings.