Bats regulate biosonar based on the availability of visual information

Figure 1. Bats regulate biosonar sampling based on the availability of vision. (A) Naïve bats’ click rate (left Y-axis, mean ± s.e., black line) and click intensity (right Y-axis, mean ± s.e., gray line). The averages were calculated across all individuals for each of the light levels (B) On-board audio recordings of echolocation in the laboratory under different light levels. X and Y scale bars are the same for both recordings. Note how both the rate and intensity of clicks increase in the dark. (C) Echolocation rate as a function of experience in 4 light levels (mean ± s.e.). (D) Click rate at the fi rst and the second half time of the fl ight (mean ± s.e.) through the corridor. The symbols are defi ned as following: *p < 0.05, **p < 10–2, ***p < 10–3. The number of bats participating in each condition is specifi ed in the Supplemental experimental procedures. Data were collected at Tel-Aviv University and Johns Hopkins University. Also see Figures S1 and S2. Bats regulate biosonar based on the availability of visual information