Texture contrast aftereffects are monocular; texture density aftereffects are binocular

Two experiments examined interocular transfer for simple and dynamic aftere ffects of density and contrast. Simple aftereffects of texture contrast wer e shown to be primarily monocular. Texture density aftereffects were shown to be primarily binocular. Similarly, dynamic aftereffects to repeated chan ges in contrast were found to be completely monocular; those to repeated ch anges in density were found to be entirely binocular. Since contrast and de nsity aftereffects differ in their sensitivity to eye-of-origin, they likel y depend on different neural loci, and are not manifestations of the same u nderlying adaptation. Consistent with this conclusion, it is proposed that. whereas contrast normalization (and perhaps contrast aftereffects) may be localized to simple cells in Vl, density coding and normalization require c omputations only available in complex cells and beyond. (C) 2001 Elsevier S cience Ltd. All rights reserved.