Roosli Christof, Dobrev Ivo, Sim Jae Hoon, Gerig Rahel, Pfiffner Flurin, Stenfelt Stefan, Huber Alexander M
*Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Zurich, University of Zurich, Zurich, Switzerland †Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden.
Otol Neurotol. 2016 Oct;37(9):e384-90. doi: 10.1097/MAO.0000000000001121.
Intracranial pressure and skull vibrations are correlated and depend on the stimulation position and frequency.
A hearing sensation can be elicited by vibratory stimulation on the skin covered skull, or by stimulation on soft tissue such as the neck. It is not fully understood whether different stimulation sites induce the skull vibrations responsible for the perception or whether other transmission pathways are dominant. The aim of this study was to assess the correlation between intracranial pressure and skull vibration measured on the promontory for stimulation to different sites on the head.
Measurements were performed on four human cadaver heads. A bone conduction hearing aid was held in place with a 5-Newton steel headband at four locations (mastoid, forehead, eye, and neck). While stimulating in the frequency range of 0.3 to 10 kHz, acceleration of the cochlear promontory was measured with a Laser Doppler Vibrometer, and intracranial pressure at the center of the head with a hydrophone.
Promontory acceleration and intracranial pressure was measurable for all stimulation sites. The ratios were comparable between all stimulation sites for frequencies below 2 kHz.
These findings indicate that both promontory acceleration and intracranial pressure are involved for stimulation on the sites investigated. The transmission pathway of sound energy is comparable for the four stimulation sites.
颅内压与颅骨振动相关，且取决于刺激位置和频率。
通过覆盖颅骨的皮肤进行振动刺激，或通过颈部等软组织进行刺激，均可引发听觉。目前尚不完全清楚不同的刺激部位是否会诱发导致这种感知的颅骨振动，或者其他传导途径是否占主导地位。本研究的目的是评估在岬部测量的颅内压与针对头部不同部位刺激时颅骨振动之间的相关性。
对四个人类尸体头部进行测量。使用一个5牛顿的钢制头带将骨传导助听器固定在四个位置（乳突、前额、眼部和颈部）。在0.3至10千赫兹的频率范围内进行刺激时，使用激光多普勒测振仪测量耳蜗岬部的加速度，并用水听器测量头部中心的颅内压。
所有刺激部位的岬部加速度和颅内压均可测量。在2千赫兹以下的频率，所有刺激部位的比率相当。
这些发现表明，在所研究的部位进行刺激时，岬部加速度和颅内压均起作用。四个刺激部位的声能传导途径相当。
