Frequency-shift detectors bind binaural as well as monaural frequency representations.
Samuele Carcagno1, Catherine Semal, Laurent Demany
1Institut de Neurosciences Cognitives et Integratives d'Aquitaine, Universite de Bordeaux, France. samuele.carcagno@u-bordeaux2.fr
Summary
This study reveals that frequency-shift detectors (FSDs) process pitch centrally, independent of sound location. These automatic detectors link successive sounds, even with binaural stimuli.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Human Auditory Perception
Background:
- Previous research suggested automatic frequency-shift detectors (FSDs) link successive sounds.
- The role of the binaural system in FSD characteristics remained unclear.
Purpose of the Study:
- To investigate the characteristics of frequency-shift detectors (FSDs) in relation to the binaural system.
- To determine if FSDs operate on peripheral or central auditory representations.
Main Methods:
- Listeners performed "present/absent" and "up/down" tasks with pure tones and dichotic stimuli.
- Stimuli included chords followed by test tones presented monaurally or dichotically.
- Pitch salience of dichotic stimuli was matched to monaural stimuli.
Main Results:
- Listeners performed better on the "up/down" task than the "present/absent" task, supporting FSD existence.
- This advantage persisted with dichotic stimuli evoking pitch via binaural processing.
- Performance with dichotic stimuli matched monaural stimuli of similar pitch salience.
Conclusions:
- Frequency-shift detectors (FSDs) are insensitive to sound localization cues.
- FSDs operate on central frequency representations, at or above the convergence of auditory pathways.
- Auditory processing of frequency shifts is largely independent of spatial auditory information.
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