**Author details**

*The Human Auditory System - Basic Features and Updates on Audiological Diagnosis and Therapy*

about sound field changes when the IACCE3 value changed. ASW changes between (ASW (0.03) and ASW (0.45)), which were more evident in the right hemisphere, affected both right and left hemispheres. They are coherent while the N2 latency of SVR significantly prolonged in both left and right hemispheres under changes of subjective diffuseness in IACCE3 found by Ando et al. [20]. Different sites are activated

Cerebral specialization has been reported to be determined by focused conscious decisions. For instance, Floel et al. [23] conducted a spatial—visual focus experiment and used a Doppler ultrasound system and magnetic resonance imaging (MRI) equipment to observe the brain reactions of right-handed participants; the researchers found that both spatial recognition and speech functions were activated in the right hemisphere, which corresponded to clinical

Nevertheless, for CBW researches, we conclude that α-waves (8–12 Hz) mainly responds to the emotional reactions; β-waves (13–30 Hz) reacts to the auditory matter drift (**Figures 6** and **7**). But the left hemisphere leads focus or attention on the varying of situational conditions (**Figures 8** and **9**), and the right one blends with imaginable feeling and experience. Hemispheric specialization has to pay attention to the conditioned response, conscientious and careful detail to setup each

I would like to express my thanks to the graduated students, Yong-Shang Chen and Qi-Wen Lin who have, in brainwaves' experiments, helped me in the course of preparing this study. In particular, I wish to thank Professor Em. Yoichi Ando, who kindly gave me directions on my brain research and data analysis methodology. I am also indebted to the Ministry of Science and Technology Taiwan, for their 2 years period (2007 and 2012) of financial support to complete this research. Meanwhile, the application conformed to academic ethics for the conduct of

research. Moreover, during the brainwave experiments, the subjects were assured of their safety and told the procedure was non-invasive. Special thanks are due to my many colleagues for their participation in the experiments involving the subjective

ASW apparent source width, a sound perception of the subjective dif-

CBW continuous brainwave, a term to distinguish from an evoked poten-

SVR slow vertex response, an evoked potential is a direct result after a specific sensory stimulus in the period of 10–500 ms LEV listener envelopment, a sound perception of the subjective diffuse-

SD semantic differences, a method of questionnaire employed the scale of responses caused by a psychological affection

τ<sup>e</sup> effective delay of autocorrelation function (ACF)

tial (EP) or evoked response within EEG

ness occurred after 80 ms of stimulus

fuseness occurred from beginning to 80 ms of stimulus Δt1 delay gap between direct and first reflection in a defuse sound field IACCE3 binaural initial (<80 ms) interaural cross-correlation function

by brainwaves during focused and ambient use of the brain.

experiment results.

brainwaves' experiment.

**Acknowledgements**

**Glossary of symbols**

judgments and the brainwaves' recordings.

ΑCF autocorrelation function

**46**

Chiung Yao Chen Department of Architecture, Chaoyang University of Technology, Taiwan

\*Address all correspondence to: chychen@cyut.edu.tw

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
