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Temporal integration and multiple looks, revisited: weights as a function of time.
1Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115, USA.
The Journal of the Acoustical Society of America
|April 23, 1999
Summary
This study investigated temporal integration in hearing using a multiple looks hypothesis. Results suggest this model explains tone detection in random maskers but not coherent ones.
Area of Science:
- Auditory perception
- Psychoacoustics
- Signal detection theory
Background:
- Temporal integration is crucial for detecting brief auditory signals.
- The "multiple looks" hypothesis proposes that the auditory system combines information from successive brief signal segments over time.
- Understanding how signal duration affects detection is key to auditory processing models.
Purpose of the Study:
- To test the "multiple looks" hypothesis for temporal integration in auditory detection.
- To determine if the contribution of brief signal segments changes over time.
- To compare predictions from the "multiple looks" model with empirical data across different masking conditions.
Main Methods:
- Psychophysical measurements of tone burst detectability in various maskers (single-band, incoherent, coherent).
- Signal pulses varied in level around masked threshold, with temporal position effects analyzed.
- Conditional psychometric functions (d'² vs. signal intensity²) were used to estimate pulse contributions.
- Temporal integration functions were predicted using "multiple looks" model parameters and compared to measured functions.
Main Results:
- A small but significant effect of temporal pulse location on detection was observed.
- Predictions from the "multiple looks" model aligned well with measured temporal integration in single-band and incoherent maskers.
- The model failed to accurately predict temporal integration in the coherent masker condition.
- Steep temporal integration functions in coherent maskers remain unexplained by current theories.
Conclusions:
- The "multiple looks" hypothesis provides a viable explanation for temporal integration in auditory detection for random maskers.
- The model's limitations in coherent maskers highlight the need for further theoretical development in auditory signal processing.
- Findings contribute to understanding how the auditory system integrates brief signals over time, particularly concerning masker envelope properties.