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A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments
Published on: March 1, 2022
Judgments of intensity for brief sequences
1VA RR&D National Center for Rehabilitative Auditory Research, Portland VA Medical Center, 3710 SW US Veterans Hospital Road, Portland, Oregon 97239, USA. frederick.gallun@va.gov
The Journal of the Acoustical Society of America
|April 8, 2010
Summary
Listeners struggle with intensity judgments for sequential sounds, requiring higher sound intensity for later bursts. This suggests an intensity-processing deficit for sounds presented in quick succession.
Area of Science:
- Auditory Perception
- Psychoacoustics
- Human Auditory Processing
Background:
- Accurate intensity discrimination is crucial for understanding speech and environmental sounds.
- Sequential auditory stimuli may pose unique challenges to intensity processing compared to isolated sounds.
Purpose of the Study:
- To investigate intensity discrimination abilities for sequential auditory stimuli.
- To determine if target intensity thresholds differ between isolated and sequential noise bursts.
- To explore the impact of target position and listener age on intensity discrimination in sequences.
Main Methods:
- An intensity-discrimination task was employed using three brief (50 ms) noise bursts.
- Participants judged the intensity of target bursts within sequences of three bursts.
- Target intensity thresholds were compared to those for isolated bursts.
- Target position within the sequence was varied, and listener age was considered.
Main Results:
- Higher intensity levels were required for targets in sequential bursts compared to isolated bursts, particularly for later targets.
- Randomizing target position did not significantly improve performance.
- No reliable differences in thresholds were found between younger and older listeners.
Conclusions:
- Sequential stimulus presentation leads to increased intensity discrimination thresholds.
- A specific deficit in intensity processing for later-occurring sounds in a sequence is indicated.
- Age does not appear to be a significant factor in this sequential intensity processing deficit.
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