Effect of multisensory training on the relationship between final head bearing and auditory target location in implanted animals with early-onset hearing loss. A–D, Stimulus-response plots showing the distribution of final head bearings as a function of stimulus location for animals fitted with a UniCI (A, B) or BiCIs (C, D). Data are shown before (A, C) and after multisensory training (B, D), and linear regression lines have been fitted in each case. The slopes of these lines increased for both groups of early-deafened ferrets, but post hoc comparisons showed that the slope was significantly higher after multisensory training (D) in the bilaterally implanted animals than before training (C) and at either stage in the UniCI group, whereas no significant differences were found for any of the other pairwise comparisons. B, D, Gray shaded area represents the frontal hemifield within which the multisensory training was provided.