The origin of order effects in the results of the bi-thermal caloric test

International Journal of Audiology
Guy R Lightfoot

Abstract

An order effect, characterized by a progressive decline in response magnitude, has been observed in the caloric test, and it has been suggested that the effect may be countered by applying a correction. This study was undertaken to determine whether the effect has its origin in physiological adaptation or in calibration drift of the recording system. Thirty-two normal subjects underwent the caloric test, in which their nystagmus was monitored simultaneously by both electronystagmography (ENG) and videonystagmography (VNG). The experimental design also allowed other aspects of the caloric test sequence to be investigated. No evidence of physiological adaptation of the response was seen. However, there was a significant change in corneoretinal potential, and hence ENG calibration, during the tests. This was more marked if subjects' eyes were maintained in darkness. It is recommended that no correction be made for order effects but that the calibration of ENG-based systems is adjusted immediately prior to each caloric irrigation.

Citations

Mar 4, 2006·Laterality·Anthony J O'Brien, Neil Gravill
Dec 7, 2007·Audiology & Neuro-otology·Jessica VitkovicGary Rance
Apr 15, 2014·International Journal of Audiology·Natalie Corless, Susannah Goggins
May 26, 2016·Acta Oto-laryngologica·Isaac Tranter-EntwistleNicholas Cutfield
Jan 7, 2009·Ear and Hearing·Guy LightfootFrances Tweedy
Jan 6, 2012·International Journal of Occupational Medicine and Environmental Health·Piotr PietkiewiczJurek Olszewski
Feb 1, 2018·American Journal of Audiology·Elizabeth BurnetteDennis Frank-Ito
Dec 20, 2019·International Journal of Audiology·Charlotte SkipperDebbie Cane
Sep 30, 2010·International Journal of Audiology·Guy Lightfoot, Laura Milner
Aug 9, 2020·Journal of Neurology·Dmitrii StarkovRaymond van de Berg

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