Figure 2.

Paradigm to derive STRF from responses to ripples varied in full velocity–density range. A, Spike events of IC neuron responding to ripples with densities of 0.4–2 cycles/octave and velocities of 8 to 40 Hz. Responses are shown for downward sweep direction (Ω > 0). B, Period histograms derived from responses as shown in A. Histograms are shown for responses to all stimuli (both sweep directions and Ω = 0). Phases in degrees are shown above each histogram. C, Magnitude and phase of ripple transfer function. D, STRF: descriptor of the response to spectrotemporal envelope modulations. It can be considered a time-dependent frequency filter or a frequency-dependent impulse response.