Figure 2

Example psychometric curves for four neonatally deafened, cochlear implanted (NDCI) rats localizing rectangular windowed pulse trains by interaural time difference (ITD). The first four columns represent a different pulse rate from left to right 50, 300, 900, and 1800 pulses per second (pps), each indicated with a different shade of blue. The y-coordinates reflect the proportion of trials during which the animal responded on the “right” hand spout (Prop. “Right” Resp.). The x-axis shows the tested ITD values from − 150 to + 150 µs. Negative ITD values indicate left ear leading ITDs. Annotations above or below each marker indicate the number of trials the animal chose the right hand side spout over the total number of trials for the given ITD value on the x-axis. Dark red curves show sigmoidal fits to the responses, bright red lines are linear fits with bounds, light pink are null model psychometric curve fits (see “Data analysis” in the Methods section for details on the model fits). Green dashed lines show the slopes of psychometric curves at ITD = 0 µs. The slopes serve to quantify the behavioral sensitivity of the animal to ITDs. The fifth column summarizes the ITD sensitivity across the different pps per animal as a function of slope. Each row shows the responses for a given animal. Psychometrics of all CI animals are shown in Fig. S2.