Premium
Method for establishing electronystagmograms for normal humans subjected to caloric stimulation
Author(s) -
Nagle Duane W.,
Anderson Ernest G.
Publication year - 1972
Publication title -
the laryngoscope
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.181
H-Index - 148
eISSN - 1531-4995
pISSN - 0023-852X
DOI - 10.1288/00005537-197209000-00010
Subject(s) - vestibular system , oscilloscope , stimulus (psychology) , eye movement , caloric theory , computer science , data acquisition , nystagmus , digital recording , channel (broadcasting) , computer vision , audiology , artificial intelligence , psychology , computer hardware , medicine , telecommunications , detector , psychotherapist , operating system
The purpose of this paper is to develop a method to determine how the eyes actually move in normal subjects, separately and in concert, in response to a given vestibular stimulus, that is, to develop a method of establishing electro‐nystagmogram norms for normal subjects. A data acquisition system utilizing DC recordings was designed and built. The horizontal and vertical movement of each eye was measured independently utilizing a four‐channel DC system. Two two‐channel DC strip chart recorders were used for immediate visualization and also a seven‐channel data acquisition system which is capable of changing analog information into digital form. This information is recorded on magnetic tape which can be fed as data into a digital computer. A computer program was developed which identified all nystagmus cycles and statistically established different values for the characteristics deemed necessary to the establishment of normal electro‐nystagmograms. The program also determines the correlation coefficient of the eye movement of the two eyes during caloric stimulation of a single labyrinth. Since no prior knowledge was assumed as to how the eyes would respond to a given stimulus to the vestibular organ, the position of the electrical axis of the eye must be known at all times. This was documented by recording the circumferential movement of the eye on a duel channel, duel trace storage oscilloscope and photographing the resulting trace. Preliminary data from a limited number of normal patients are shown to indicate order of magnitudes of the characteristics previously mentioned. This data also indicated that the characteristics of a normal electro‐nystagmogram were not affected by the temperature of the water used in the caloric stimulation.