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Further examination of pitch discrimination interference between complex tones containing resolved harmonics
Hedwig E Gockel1, Robert P Carlyon, Christopher J Plack
1MRC Cognition and Brain Sciences Unit, 15 Chaucer Road, Cambridge, United Kingdom. hedwig.gockel@mrc-cbu.cam.ac.uk
The Journal of the Acoustical Society of America
|February 12, 2009
Summary
Pitch discrimination interference (PDI) impairs fundamental frequency (F0) perception. This study found PDI performance improves with larger F0 differences, contrary to prior research, and noted an asymmetry when the interferer tone was spectrally lower than the target.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Signal Processing
Background:
- Pitch discrimination interference (PDI) occurs when distinguishing fundamental frequency (F0) between tones.
- Previous studies showed modest PDI with resolved harmonics and small F0 differences (DeltaF0).
- An earlier study reported increased PDI with larger DeltaF0 when the interferer was spectrally lower than the target.
Purpose of the Study:
- To replicate and investigate pitch discrimination interference (PDI) in complex tones with resolved harmonics.
- To examine the effect of varying fundamental frequency differences (DeltaF0) on PDI.
- To explore potential asymmetries in PDI based on the spectral relationship between target and interferer tones.
Main Methods:
- Complex tones with resolved harmonics were used as targets and interferers.
- Participants performed F0 discrimination tasks with varying DeltaF0.
- Interferer spectral position relative to the target was manipulated (lower, higher, or same spectral region).
Main Results:
- PDI was replicated for small DeltaF0 with resolved harmonics.
- Contrary to prior findings, PDI performance consistently improved as DeltaF0 increased.
- An asymmetry was observed: PDI was more challenging when the interferer was spectrally lower than the target, sometimes requiring modified instructions or stimuli.
Conclusions:
- The relationship between F0 difference and PDI is not consistently negative; performance improves with larger DeltaF0.
- Spectral positioning of interferers relative to targets creates an asymmetric listening challenge.
- Further research is needed to understand the mechanisms behind this spectral asymmetry in auditory perception.
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