| Zugriffsnummer | 23219 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Investigation in auditory cortex activation by low-frequency sound and infrasound using magnetic resonance imaging: stimulus generation and control, and noise assessment |
| Autor(in); Institution |
Hensel, Johannes; 1.6, Schall, PTB-Braunschweig
Dommes, Esther; Charité Universitätsmedizin, CCM, Berlin, GERMANY
Scholz, Günther; Charité Universitätsmedizin, CCM, Berlin, GERMANY
|
| Quelle/Jahr | NAG/DAGA 2009 : International Conference on Acoustics, Rotterdam, 23 - 26 March 2009 ; proceedings:(2009), 753 - 756 |
| Availability | [CD-ROM] ; file name:data\\articles\\000448.pdf |
| Herausgeber(in) |
Boone, Marinus M.
|
| ISBN | 978-3-9808659-6-8 |
| Verlag | Berlin: DEGA |
| Konferenzangaben | International Conference on Acoustics, NAG/DAGA 2009, Rotterdam, 23-26, March, 2009, The Netherlands |
| Klassifikationscode | PACS: 43.50.+y ; PACS: 43.64.+r ; PACS: 43.80.+p |
| Zusammenfassung | Following the demonstration of the impact of infrasound in the cochlea [Hensel et. al. 2007, Hear. Res. 233, 67-76], in the present study the stimulation of the auditory cortex down to 12 Hz was investigated by means of functional magnetic resonance imaging (MRI). The neuroradiological evidence of cortical excitation will be reported elsewhere. In this report, details of stimulus application and noise assessment are described. In order to exclude the other sensory paths, and to avoid the di_culties of free-field stimulation, the stimuli were delivered directly into the ear canal. This would ideally have required a metal-free earphone, which was not available. 12 meters of silicon tube and an ear-plug were used instead. To control the influence of standing waves, the sound pressure at the ear was measured in-situ by a metal-free optical microphone, embedded at the interface of tube and ear-plug. At very low frequencies, where high sound pressures were needed even near the hearing threshold, it turned out to be a demanding task to keep the harmonics small. The microphone position near the ear canal entrance allowed to measure the MRI noise entering the system up to that point. Spectral analysis showed that this noise already contained some infrasound. |
Zitierung
Hensel, J., Dommes, E., & Scholz, G. (2009). Investigation in auditory cortex activation by low-frequency sound and infrasound using magnetic resonance imaging: stimulus generation and control, and noise assessment. International Conference on Acoustics, NAG/DAGA 2009, Rotterdam, 23-26, March, 2009, The Netherlands.