Figure 2.

Typical unisensory and multisensory responses in naïve and normal SC neurons. Depicted for each of these two neurons are its responses to visual and auditory stimuli presented alone and together in spatiotemporal concordance. On the left are the impulse rasters for each response (ordered bottom-to-top), on the right are summary histograms for the average number of elicited impulses in each condition. Vertical lines through the bars represent the standard error of the mean SEM. A, The multisensory response in the naïve exemplar was not significantly greater than its largest unisensory response (here, V), and thus appeared to be insensitive to the auditory input in the VA condition. Response magnitudes (impulses/trial): V = 4.5, A = 3.65, VA = 5.1; UI = 10%, ME = 13% (multi vs uni, p = 0.307, Mann–Whitney U test). B, This result contrasts with the response pattern in the normal exemplar whose multisensory response was significantly enhanced by the auditory stimulus, becoming 117% greater than its strongest unisensory response (V). V = 6.17, A = 5.75, VA = 13.4; UI = 3%, ME=117%. **p = 7.50E−7.