Figure 3.

Bidimensional generalization reveals hierarchical perception of sound dimensions in mice

(A) Top: Spectrograms of the stimulus set used in the task. The safe sound (blue) is a 100 octave/sec upward FM sweep, and the unsafe sound (red) is a 50 octave/sec downward FM sweep. All FM sweeps were centered at 8 kHz. Bottom: Generalization gradients showing the average response to each stimulus during the generalization phase.

(B) Similar to (A) for the combination of sweep direction and duration dimensions. Average generalization gradients (bottom) revealed an effect of both dimensions on behavior.

(C) Similar to (A) for the combination of frequency range and duration dimensions. Average generalization gradients (bottom) showed that both dimensions controlled the animals’ behavior in a frequency-dependent manner. Error bars represent standard error throughout.