Fig. 5.

Components of the cortical evoked response. Vertical dotted lines demarcate the final stimulus segment containing either pitch (IRN32, IRN8) or noise (IRNo) (see also Fig. 1). For all conditions, an obligatory P1/N1 complex is observed between 50 and 150 ms reflecting the responses to the onset of stimulus energy. A clear cortical pitch response (CPR) is observed as a prominent negative deflection (~ 630 ms) in the transition from noise to pitch (IRNo→IRN₈, IRNo→IRN₃₂). No response is observed in the transition from pitch to noise (IRN32→IRNo) or from noise to noise (Noise→IRNo). CPR amplitude increases systematically with increasing stimulus temporal regularity.