Fig. 7.

Effects of loss of activity in A1 on sound localization in the midsagittal plane. A: data from 6 animals showing the mean percentage correct score for each animal at the speaker separation indicated before implantation of muscimol-Elvax (open symbols) and with the implants in place (filled symbols). B: data from 4 animals showing the scores obtained before (open symbols) and after bilateral removal of A1 (filled symbols). Note that the ferrets tend to make lower scores after inactivation or aspiration of A1. One exception to this was F0318, whose data are indicated by the diamonds in A, in which the Elvax sheet became encapsulated by dura and displaced from the surface of the left A1. This is the same animal, again indicated by the diamonds in B, whose auditory cortex lesion was effective unilaterally only.