Fig. 1.

Experimental procedures. (a) Illustration of a stimulus display sequence (Experiment 1). All of the stimulus materials were presented to the right eye during training. In transfer sessions, the stimuli were all presented to the left eye in corresponding spatial locations. (b) Stimulus display sequence for Experiment 2. For some observers, training was administered in the left eye. For others, training was in the right eye. (c) Motion stimuli embedded in eight different amounts of external noise. Each image shows five frames of a rightward moving sine-wave grating. The phase shift between successive frames is 90°.