title: Interaction between osseous and non-osseous vibratory stimulation of the human cadaveric head.
abstract: Bone conduction (BC) stimulation can be applied by vibration to the bony or skin covered skull (osseous BC), or on soft tissue such as the neck (non-osseous BC). The interaction between osseous and non-osseous bone conduction pathways is assessed in this study. The relation between bone vibrations measured at the cochlear promontory and the intracranial sound pressure for stimulation directly on the dura and for stimulation at the mastoid between 0.2 and 10 kHz was compared. First, for stimulation on the dura, varying the static coupling force of the BC transducer on the dura had only a small effect on promontory vibration. Second, the presence or absence of intracranial fluid did not affect promontory vibration for stimulation on the dura. Third, stimulation on the mastoid elicited both promontory vibration and intracranial sound pressure. Stimulation on the dura caused intracranial sound pressure to a similar extent above 0.5 kHz compared to stimulation on the mastoid, while promontory vibration was less by 20-40 dB. From these findings, we conclude that intracranial sound pressure (non-osseous BC) only marginally affects bone vibrations measured on the promontory (osseous BC), whereas skull vibrations affect intracranial sound pressure.
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, University Hospital Zürich, Switzerland; University of Zurich, Switzerland.
authors.forename: J H
authors.initials: JH
authors.lastname: Sim
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, University Hospital Zürich, Switzerland; University of Zurich, Switzerland.
authors.forename: I
authors.initials: I
authors.lastname: Dobrev
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, University Hospital Zürich, Switzerland; University of Zurich, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Gerig
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, University Hospital Zürich, Switzerland; University of Zurich, Switzerland.
authors.forename: F
authors.initials: F
authors.lastname: Pfiffner
authors.affiliation: Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden.
authors.forename: S
authors.initials: S
authors.lastname: Stenfelt
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, University Hospital Zürich, Switzerland; University of Zurich, Switzerland.
authors.forename: A M
authors.initials: AM
authors.lastname: Huber
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, University Hospital Zürich, Switzerland; University of Zurich, Switzerland. Electronic address: christof.roeoesli@usz.ch.
authors.forename: C
authors.initials: C
authors.lastname: Röösli
mesh_terms: D000161:Acoustic Stimulation; D001309:Auditory Threshold / Q000502:physiology*; D001844:Bone Conduction / Q000502:physiology*; D002102:Cadaver; D003051:Cochlea / Q000502:physiology*; D006257:Head; D006801:Humans; D008416:Mastoid / Q000502:physiology; D009038:Motion; D011312:Pressure; D059629:Signal-To-Noise Ratio; D012886:Skull / Q000502:physiology; D013016:Sound; D014732:Vibration
keywords: Bone conduction; Dura stimulation; Intracranial sound pressure; Mastoid stimulation; Promontory vibration