| Zugriffsnummer | 33830 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Auditory cortex activation by infrasonic and low-frequency sound of equalized individual loudness |
| Autor(in); Institution |
Kühler, Robert; 1.6, Schall, PTB-Braunschweig
Hensel, Johannes; 1.6, Schall, PTB-Braunschweig
Koch, Christian; 1.6, Schall, PTB-Braunschweig
Bauer, Martin; 8.2, Biosignale, PTB-Berlin
Sander-Thömmes, Tilmann; 8.2, Biosignale, PTB-Berlin
|
| Quelle/Jahr | Proceedings of Euronoise 2015: [Online and USB-Stick] file name: 00402.pdf (2015), 2577 - 2582 |
| Herausgeber(in) |
Glorieux, Christ
|
| ISSN | 2226-5147 |
| URL | |
| Konferenzangaben | 10th European Congress and Exposition on Noise Control Engineering, Euronoise 2015, Maastricht, 31, May - 03, June, 2015, The Netherlands |
| Klassifikationscode | PACS: 43.66.Cb ; PACS: 43.28.Dm ; PACS: 43.64.Ri |
| Freie Schlagworte | Infrasound ; Brain response ; MEG ; Loudness |
| Zusammenfassung | Categorical loudness scaling as standardized in ISO 16832:2006 provides an easy and fast procedure to determine the loudness over the whole dynamic range of the auditory system. Within this method the loudness is rated by the subject on a scale with defined categories, such as "soft", "moderate", "loud", etc. In clinical audiology this method is widely used to determine the amount of recruitment in hearing impaired listeners. This method is extended to infrasonic (f < 20 Hz) and low frequencies (f ≥ 20 Hz) in order to investigate the loudness perception for such frequencies. 30 otologically normal subjects performed the categorical loudness scaling procedure for monaural stimulation with pure tones between 8 and 125 Hz. Stimuli were presented by means of a newly designed insert-earphone sound source for infrasonic frequencies. The loudness functions showed a significant decrease of the dynamic range towards lower frequencies. To investigate the hearing mechanism at infrasonic frequencies more extensively, brain responses were measured by means of Magnetoencephalography (MEG). The variation of the M100 brain response stimulated by pure tones with decreasing frequencies from 250 Hz down to 8 Hz for 16 otologically normal subjects is investigated. The stimuli were ramped sine tones of equal individually perceived loudness determined before by the categorical loudness scaling method described above. Brain responses were recorded by a Yokogawa MEG system and averaged to obtain the M100 response. The positions of the underlying magnetic field generators were estimated offline, using a dipole fit routine. Stable responses were measured for stimulation frequencies between 20 and 250 Hz. At 8 and 12 Hz the results are difficult to interpret. |
Zitierung
Kühler, R., Hensel, J., Koch, C., Bauer, M., & Sander-Thömmes, T. (2015). Auditory cortex activation by infrasonic and low-frequency sound of equalized individual loudness. 10th European Congress and Exposition on Noise Control Engineering, Euronoise 2015, Maastricht, 31, May - 03, June, 2015, The Netherlands.