Fig. 8.

As soon as multisensory neurons develop the capacity to integrate cross-modality cues, the magnitude of the enhancement they exhibit to spatially and temporally coincident stimuli is adult-like. This is evident from the line connecting the open squares. Nonetheless, because the number of integrative neurons matures gradually over time, the population profile takes ∼3 months to mature. Thus, the average enhancement for all multisensory neurons increases gradually as a function of postnatal age as shown by theline connecting the closed circles. The dashed line represents the mean adult level of multisensory enhancement.