Fig. 8.

Perceptual learning during communication. Upper panel: this shows epoch by epoch changes in the posterior expectations (lines) of the parameter of the first bird (blue) and second bird (green). The shaded areas correspond to 90% (prior) Bayesian confidence intervals. The broken lines (and intervals) report the results of the same simulation but when the birds could not hear each other. The lower panels show the synchronisation of extrasensory (higher) posterior expectations for the first (left panel) and subsequent (right panel) exchanges respectively. This synchronisation is shown by plotting a mixture of expectations (and their temporal derivatives) from the second bird against the equivalent expectations of the first bird, where this mixture is optimised assuming a linear mapping.