Plasticity of orientation specific chromatic aftereffects

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Changes in the orientation of McCollough effects were explored with and without prolonged exposure to prismatic tilt and subsequent viewing of chromatic inducing stimuli. Prolonged exposure to prism adaptation generates a reduction in the optically induced tilt and thus a disparity between the perceived and the retinal orientation of the chromatic inducing stimuli. Saturated chromatic aftereffects, following prism adaptation and subsequent induction of the McCollough effect, were obtained when the orientation of the achromatic test gratings matched the perceived, rather than the retinal, orientation of the inducing chromatic gratings.