Figure 1.

The two experimental exposure sites included one macular (left) and one extramacular (right). During exposure trials, four animals experienced the same visual and auditory stimuli in one of two possible stimulus configurations and at one of the two exposure sites (macular, 0°; extramacular, 30°) shown on the schematics above. The schematics represent the central 60° of visual–auditory space, and each concentric circle represents 10°. The stimulus configurations included a cross-modal (visual–auditory) and a modality-specific (interleaved visual and auditory) paradigm. The visual stimulus was a moving bar of light, represented by the icon and arrow, and the auditory stimulus was a broadband noise burst, represented by the star. One additional animal received random presentation of the modality-specific stimuli at random locations (see Materials and Methods for details).