Contents

Abstract
Introduction

A. The problem
B. The concept of a channel
C. Within- vs across-channel effects.
D. Comodulation Masking Release
E. Models to account for CMR
F. Comodulation Detection Differences
G. Summary

Experiment 1. A demonstration of CDD.

A. Rationale
B. Method

1. Listening conditions
2. Stimuli and apparatus
3. Procedure
4. Subjects

C. Results and discussion
D. Conclusions

Experiment 2. The effect of altering onset asynchrony.

A. Rationale
B. Method

1. Listening conditions
2. Stimuli and apparatus
3. Procedure
4. Subjects

C. Results and discussion



Experiment 3. CDD with two masker bands.

A. Rationale
B. Method

1. Listening condtions
2. Stimuli and apparatus
3. Procedure
4. Subjects

C. Results and discussion
D. Conclusion

Experiment 4. Assessing the relative effects of the masking bands.

A. Rationale
B. Method

1. Listening conditions
2. Stimuli and apparatus
3. Procedure
4. Subjects

C. Results and discussion

A simple model. Modelling detection times.

A. Rationale
B. Details of the model

1. Outline
2. Detailed description

C. Using the model

Experiment 5. Measuring psychometric functions.

A. Rationale
B. Method

1. Listening condtions
2. Stimuli and apparatus
3. Procedure
4. Subjects

C. Results and discussion

Experiment 6. The effects of partial correlation produced by introducing a time delay.

A. Rationale
B. Method

1. Listening conditions
2. Stimuli and apparatus
3. Procedure
4. Subjects

C. Results and discussion

Experiment 7. The effects of altering the bandwidth of the noises.

A. Rationale
B. Method

1. Listening conditions (CDD)
2. Listening conditions (CMR)
3. Stimuli and apparatus
4. Procedure
5. Subjects

C. Results and discussion
D. Mechanisms for signal detection in CDD

Conclusions

A. Overview
B. A recap of the experiments and model

1. Experiment 1 - A demonstration of CDD
2. Experiment 2 - The effect of altering onset asynchrony
3. Experiment 3 - CDD with two masker bands
4. Experiment 4 - Assessing the relative effects of the masking bands.
5. A within-channel detection time model
6. Experiment 5 - Measuring psychometric functions
7. Experiment 6 - The effects of partial correlation produced by introducing a time delay.
8. Experiment 7 - The effects of altering the bandwidth of the noises.

C. Summary of the experiments and model
D. Mechanisms for within-channel signal detection in CDD
E. Future work

Appendix A. Calculation of partial correlation.

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