Laser light-scattering investigations of the teleost swimbladder response to acoustic stimuli

Abstract

When a laser pencil is directed through the teleost swimbladder fringe patterns can be seen in the far-field that are (a) highly sensitive to the orientation and position of the swimbladder with respect to the incident pencil and (b) a representation of contributions from each membrane through which the light passes. The fringe pattern fluctuates in intensity, and to some extent in position, in response to driving forces that distort the swimbladder. The spectrum of these very small distortions can be measured by standard light scattering techniques. This method was used to study the response of in situ swimbladders to imposed acoustic fields and evidence for a sharp roll-off of the response at frequencies above 1,000 Hz was found. Models for these effects are discussed.

Auditory chain reaction: Effects of sound pressure and particle motion on auditory structures in fishes

“…Only few experimental and theoretical studies (based on mathematical modelling) have investigated the factors influencing otolith motion as well as the interplay between inner ear components and ancillary auditory structures such as otophysic connections [10,19,20,[28][29][30][31].…”

Revealing sound-induced motion patterns in fish hearing structures in 4D: a standing wave tube-like setup designed for high-resolution time-resolved tomography

“…However, the technical challenge of gaining access to these internal structures, moving at amplitudes in the range of a few micrometers and at typical sound frequencies, without altering their response as a consequence of surgical procedures has hampered such research for many years. Only a limited number of experimental studies have investigated the sound-induced motion of the saccular otoliths ( de Vries, 1950 ; Sand and Michelsen, 1978 ), the swim bladder walls ( Popper, 1974 ; Clarke et al, 1975 ) or the whole set of auditory structures ( Cox and Rogers, 1987 ). Nowadays, synchrotron radiation-based techniques provide powerful approaches to perform imaging of internal structures at high spatio-temporal resolution non-invasively ( Mokso et al, 2015 ; Rack et al, 2010 ; Walker et al, 2014 ).…”