Figure 5.

Active echolocation only. A, The room size rating is shown for the four different BRIR compression factors and as a function of BRIR amplitude. Error bars indicate SE across subjects. The data show that, whereas the BRIR compression factor is strongly reflected in the subjects' classifications, the BRIR amplitude has a much smaller effect on the perceived room size. B, Regions of activity during active echolocation (active sound production with auditory feedback) compared with sound production without feedback. The auditory cortex was active bilaterally as well as primary motor areas, cerebellum, and the visual pole (for details, see Table 2). Activity maps were thresholded at p < 0.05 (FDR corrected) and overlaid on the mean structural image of all subjects in the study. x and z values indicate MNI coordinates of the current slice.