Reinstating the frontal lobes? Having more time to think improves implicit perceptual categorization: a comment on Filoteo, Lauritzen, and Maddox (2010).

In our experiment, as in that of Filoteo et al. (2010), participants learned a two-category structure in which the stimuli were straight lines that varied on three stimulus dimensions (3D): length, orientation (rotation) and screen position (from left to right on the horizontal axis). Two of these dimensions were relevant to the category decision (length and orientation) and the third (screen position) was not. The category boundary was placed so that information from the length and orientation dimensions had to be integrated to make correct categorization decisions (see Figure S1). We thank Todd Maddox for providing the stimuli files.