| Zugriffsnummer | 23889 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Observation of low-frequency and infrasound in the auditory cortex using functional magnetic resonance imaging |
| Autor(in); Institution |
Scholz, Günther; Charité, Universitätsmedizin Berlin, Campus Mitte, ENT-Dept., GERMANY
Dommes, Esther; Charité, Universitätsmedizin Berlin, Campus Mitte, Neuroradiology, GERMANY
Rothemund, Yvonne; Charité, Universitätsmedizin Berlin, Campus Mitte, Psychosomatics, GERMANY
Hensel, Johannes; 1.6, Schall, PTB-Braunschweig
|
| Quelle/Jahr | Recent developments in acoustics, noise and vibration : the16th International Congress on Sound and Vibration ; proceedings:(2009) |
| Availability | [CD-ROM] ; file name: technical_papers\\89.pdf |
| Herausgeber(in) |
Pawelczyk, Marek
|
| ISBN | 978-83-60716-71-7 |
| Verlag | Krakow: |
| Konferenzangaben | The Sixteenth International Congress on Sound and Vibration, Kraków, 05-09, July, 2009, Poland |
| Klassifikationscode | PACS: 43.50.+y ; PACS: 43.64.+r ; PACS: 43.80.+p |
| Zusammenfassung | Background and Purpose: Low frequency tones (LFT) and Infrasound (IS) are looked upon as potentially hazardous to human health. We aimed at assessing LFT-/IS-induced activation of the auditory cortex by using fMRI. Material and Methods: FMRI was used to investigate LFT/IS perception in 17 healthy female volunteers. Short tone bursts of 12 Hz and 500 Hz were delivered directly into the right external ear canal through a 12 m long silicone tube and an ear-plug. Sound pressure levels and spectral analysis of the stimuli and scanner noise were measured in-situ by using a metal-free optical microphone and a fibre-optic cable. Results: Level-dependent activation of the superior temporal gyrus, i.e. Brodmann areas (BA) 41 and 42 as well as BA 22 was delineated subsequent to acoustic stimulation with 12 Hz and 500 Hz stimuli. Thresholds for 12 Hz perception were between 110 and 90 dB SPL in normal hearing subjects. Spectral analysis revealed the occurrence of harmonics together with LFT as well as scanner noise, of which 36 Hz harmonics interfered with IS exposure at 12 Hz. Conclusion: Our results provide evidence that auditory cortex activation may be induced by LFT-/IS-exposure, depending on sound pressure levels applied. Clinical implications of our findings will have to be addressed by subsequent studies involving patients presumptively suffering from LFTdependent disorders. |
Zitierung
Scholz, G., Dommes, E., Rothemund, Y., & Hensel, J. (2009). Observation of low-frequency and infrasound in the auditory cortex using functional magnetic resonance imaging. The Sixteenth International Congress on Sound and Vibration, Kraków, 05-09, July, 2009, Poland.