Processing of Relevant Characteristics of Complex Sounds in Normal Hearing Listeners and Cochlear Implant Users 1st Edition by Wiebke Heeren ISBN 3832539972 978-3832539979

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Product details: 

ISBN 10:  3832539972 

ISBN 13: 978-3832539979

Author: Wiebke Heeren

The auditory processing of complex signals is not yet fully understood making a clearer insight into auditory system processes worth aspiring to. One approach for this purpose is to gain a better understanding of the relations between physical parameters and hearing sensations by means of psychoacoustics. Suitable measures such as loudness help to characterize the perception of sound leading to more sophisticated loudness models which could be useful in optimizing hearing devices such as cochlear implants.

The scope of this thesis therefore is the suprathreshold perception of sounds with different spectral, temporal and spatial content in normal-hearing listeners and cochlear implant users. Among others, this covers the applicability of categorical loudness scaling as a fast procedure to assess partial loudness as well as binaural and spatial hearing in cochlear implant users in a free-field measurement setup providing realistic spatial cues.

Table of contents: 

1 Introduction

1.1 Loudness

1.1.1 Spectral aspects

1.1.2 Temporal aspects

1.1.3 Spectro-temporal aspects

1.2 Spatial hearing

1.2.1 Localization cues

1.2.2 Head related transfer function

1.2.3 Static and dynamic angle discrimination

1.2.4 Binaural masking level difference

1.3 The inner ear and Cochlear Implants

1.3.1 Sound processing in the inner ear

1.3.2 Cochlear Implants

1.4 Motivation and structure of the thesis

2 Spectral loudness summation of nonsimultaneous tone pulses

2.1 Introduction

2.2 Methods

2.2.1 Subjects

2.2.2 Stimuli

2.2.3 Procedure

2.2.4 Statistical analysis

2.3 Results

2.3.1 Experiment 1: Effects of inter-pulse interval

2.3.2 Experiment 2: Effects of pulse duration

2.3.3 Experiment 3: Effect of overall duration

2.3.4 Experiment 4: Effect of reference

2.4 Discussion

2.4.1 Spectral loudness summation for pulse trains

2.4.2 Effect of tone duration in spectral loudness summation

2.4.3 Role of persistence of specific loudness in nonsimultaneous spectral loudness summation

2.4.4 Comparison with data in the literature on nonsimultaneous loudness summation

2.4.5 Residual nonsimultaneous spectral loudness summation

2.4.6 Implications for loudness models

2.5 Conclusions

3 Spectro-Temporal Weighting of Loudness

3.1 Introduction

3.2 Materials and Methods

3.2.1 Ethics statement

3.2.2 Participants

3.2.3 Apparatus

3.2.4 Stimuli and conditions

3.2.5 Procedures

3.2.6 Sessions

3.3 Results

3.3.1 Sensitivity

3.3.2 Spectro-temporal weights

3.4 Discussion

3.4.1 Comparison to previous studies on temporal weights for broadband stimuli

3.4.2 Bandwidth effects in temporal weights

3.4.3 Comparison to previous studies on spectral weights

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Tags: Wiebke Heeren, Processing of Relevant Characteristics, Normal Hearing