ABSTRACT
One emerging theme of central nervous system function is that sensory information is processed in parallel channels. A third view is that changes in form vision at isoluminance have no immediate implications for the relevance of magnocellular or parvocellular inputs. This chapter explores this third view by examining visual responses to isodipole textures. It reviews the use of isodipole textures in the study of visual processing and presents results concerning isoluminant stimuli. These results demonstrate a selective loss in local form processing at isoluminance which cannot be explained by a selective change in the spatial filtering properties of the visual system. The chapter concludes that visual evoked potential and psychophysical measures of differences between the textures do not depend on the discrepancies between the statistics of a texture example and those of the ensemble from which it is drawn.
