Fig. 2a–d.

Change in orientation angles for tadpoles tested both in no current and current conditions. The vertical dashed line at time 0 depicts time of current onset. Pre-current times are indicated by negative numbers and post-current times are indicated by positive numbers. Each individual data point represents means of observations averaged in 30-s bins (1 s every 10 s), beginning 1 min after current onset for a total time of 2.5 min. a Untreated animals; b cobalt-treated; c streptomycin-treated; d gentamicin-treated. Data from two animals are shown in each treatment condition (closed circles and open triangles), and were chosen to represent the variability in the responses. Symbols that overlap are o3set slightly for clarity