The Caloric Test: A Review of Its Principles and Practice with Especial Reference to the Phenomenon of Directional Preponderance

1966 ◽  
Author(s):  
C. S. Hallpike
Keyword(s):  
Caloric Test ◽  
Especial Reference ◽  
Directional Preponderance

Reference Values for Serial Vestibular Testing

1986 ◽  
Vol 95 (1) ◽  
pp. 83-90 ◽  
Author(s):  
Leonard Proctor ◽  
Robert Glackin ◽  
Craig Smith ◽  
Hiroshi Shimizu ◽  
Paul Lietman
Keyword(s):  
Reference Values ◽  
Test Scores ◽  
Vestibular Function ◽  
Normal Subjects ◽  
Caloric Test ◽  
Initial Value ◽  
Short Acting ◽  
Normal Limits ◽  
Vestibular Testing ◽  
Directional Preponderance

This study defines the normal limits of day-to-day variation in vestibular function. A short-acting caloric test was used and nystagmus intensity was measured by means of an interactive computerized technique. Data were analyzed from 30 normal subjects tested on three successive days and from ten of these subjects who were also tested on 11 additional occasions. Individual caloric test scores generally remained between 55% and 170% of their initial value; narrower ranges resulted when scores were averaged together. There was very little habituation of caloric responses. The upper normal limits of test-retest variation in scores for right-left difference and directional preponderance of caloric responses were 24% and 22%, respectively.

scholarly journals Directional Preponderance (DP) of Caloric Test in Patients with Various Inner Ear Lesions.

1994 ◽  
Vol 53 (2) ◽  
pp. 247-251
Author(s):  
Motohisa Ikeda ◽  
Isamu Watanabe ◽  
Jiro Muto
Keyword(s):  
Inner Ear ◽  
Caloric Test ◽  
Directional Preponderance

Hallpike’s Caloric Test

2016 ◽  
Author(s):  
Robert W. Baloh
Keyword(s):  
Body Temperature ◽  
Inner Ear ◽  
Caloric Test ◽  
Ear Canal ◽  
Caloric Testing ◽  
Minute Period ◽  
Rapid Flow ◽  
Series Of Experiments ◽  
Directional Preponderance

Charles Hallpike decided that greater precision could be obtained with the caloric test by measurement of one or more attributes of the responses to some suitably graded stimulus. He chose to measure the duration of induced nystagmus. Hallpike chose water at 30°C and 44°C (7°C below and above body temperature, respectively) and allowed it to flow for 40 seconds. These temperatures were generally well tolerated, and the comparatively large quantity of water and rapid flow minimized errors due to misdirecting the stream within the ear canal. A simple chart was used to summarize the results of the bithermal caloric test. The chart consisted of two continuous lines, each representing a total of a 3-minute period, subdivided into 10-second intervals. Hallpike conducted a series of experiments on the phenomenon of directional preponderance with caloric testing and emphasized the importance of vestibular tonus originating from the inner ear receptors.

scholarly journals EFFECTS OF LIGHT ON NORMAL RABBITS, WITH ESPECIAL REFERENCE TO THE ORGANIC REACTION

1926 ◽  
Vol 44 (4) ◽  
pp. 483-502
Author(s):  
Louise Pearce ◽  
Chester M. Van Allen
Keyword(s):  
Physical State ◽  
Marked Decrease ◽  
Organ Weight ◽  
Ultraviolet Rays ◽  
Constant Darkness ◽  
Organic Reaction ◽  
Constant Illumination ◽  
Organ Weights ◽  
Especial Reference ◽  
Concrete Form

An analysis has been made of the organ weights of normal rabbits exposed to a constant illumination having none of the shorter ultraviolet rays and of other rabbits kept in darkness for periods of 2 to 12 weeks. The environment of constant illumination was associated with a well marked decrease in the relative weights of most organs, and in certain instances this occurred when the organ weights of the controls were becoming increasingly large. There was also an associated effect of stabilization of organ weight. The majority of the organs of rabbits caged in constant darkness also showed a tendency toward decreased and stabilized weights, but these effects were less pronounced than in the rabbits caged under conditions of constant illumination. A notable exception to this general result was the weight of the liver which was markedly increased. The results of this experiment support the conception that there is a relationship between light and the physical state of the animal organism which may be expressed in the concrete form implied by the trend or direction of organ weight.

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