Is haptic perception continuous with cognition?

A further step in Pylyshyn's discontinuity thesis is to examine the penetra bility of haptic (tactual-kinesthetic) perception. The study of the percept ion of orientation and the "oblique effect" (lower performance in oblique o rientations than in vertical-horizontal orientations) in the visual and hap tic modalities allows this question to be discussed. We suggest that part o f the visual process generating the visual oblique effect is cognitively im penetrable, whereas all haptic processes generating the haptic oblique effe ct are cognitively penetrable.