Question

27. Provide answers for following questions about complex-tone pitch perception.

1. For the resolved harmonics, the neurons are phase-locked to the fire structure of each harmonic. For the unresolved harmonics, to which frequency are the neurons phase-locked? (2 points)
2. Why do temporal theories predict that complex pitch perception will be good with unresolved harmonics? (3 points)

Answer 1

A) FOR UNRESOLVED HARMONICS INTERACTS WITH IN THE PASSBAND OF SINGLE FREQUENCY MAY BE EXTRACTED BY PHASE LOCKING TO THE TEMPORAL ENVELOPE OF THE COMPLEX WAVEFORM AFTER FILTERING ,BY PHASE LOCKING TO TEMPORAL FINE STRUCTURE PEAKS LOCATED NEAR THE ENVELOPE PEAKS OR BOTH.THE FREQUENCY FROM UNRESOLVED HARMONICS CAME FROM EXPERIMENT OF SAM(SINUSOIDALLY AMPLITUDE MODULATED) TONES.A SAM TONE HAS THREE TONAL COMPONENTS,THE CARRIER FREQUENCY AND TWO SIDE BANDS .IT IS CORRESPONDING TO THE MODULATION FREQUENCY .

B) BECAUSE THE ROLE OF UNRESOLVED HARMONICS DESPITE THE GENERAL DEVELOPMENT OF PITCH PERCEPTION.IT IS TOTALLY DEPENDING SCHOUTEN'S RESIDUE THEROY .SOME FORM OF PITCH PERCEPTION POSSIBLE EVEN WITH VERY HIGH FREQUENCY PURE TONES WHERE IT IS UNLIKELY THAT PHASE LOCKING INFORMATION IS USEFUL .THE HIGHER NUMBERED HARMONICS WHICH DO NOT PRODUCE INDIVIDUAL PEAKS OF EXCITATION AND CAN NOT TYPICALLY BE HEARD OUT ARE OFTEN REFERRED TO AS BEING UNRESOLVED HARMONICS