The Influence of the Utricle on Nystagmus

Owada, Kenjiro; Shiizu, Shigehiko; Kimura, K.

doi:10.3109/00016486009123143

Cited by 28 publications

(3 citation statements)

References 6 publications

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“…Furthermore, Fluur and Siegborn sectioned the ampullary nerves very distally, in close proximity to the end organs. In this area there is a definite intercommunication between the utricular and the horizontal ampullary nerves within the bony labyrinthine capsule (26).…”

Section: Discussionmentioning

confidence: 99%

Four Channel Electronystagmographic (ENG) Studies of Eye Movements Induced by Linear Accelerations

Clement¹,

Goodhill²

1975

ORL

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A parallel-swing ENG study in rabbits led to two investigative conclusions: (a) for experimental purposes the parallel swing test must be performed with monocular, both horizontal and vertical leads, and (b) such studies must be performed in a darkened room. Following surgical bilateral ‘immobilization’ of the cupulae of the horizontal semicircular canals, horizontal nystagmus induced in the parallel-swing test is probably generated by the otolithic system.

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Section: Discussionmentioning

confidence: 99%

Four Channel Electronystagmographic (ENG) Studies of Eye Movements Induced by Linear Accelerations

Clement¹,

Goodhill²

1975

ORL

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“…Ades et al (1) tested one deaf patient with normal vestibular function and found that dizziness was reported to 260 to 2050 Hz tones at intensities ranging from 120 to 135 dB SPL. that stimulation of the otolith mechanisms may modify an existing nystagmus (55). Mohr et al (50) tested 3 patients who reported dizziness to levels of 150 to 154 dB SPL for 50-, 73-, and 100-Hz signals.…”

Section: Physiological Bases Of the Ldlmentioning

confidence: 99%

Loudness Discomfort Level for Speech

et al. 1980

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This study was undertaken to compare the speech loudness discomfort levels (LDL's) with two instructional sets which have been proposed for saturation sound pressure level selection of hearing aids. The phraseology recommended by McCandless and by Berger was presented to normalhearins and hearing-impaired listeners. The normal-hearing subjects obtained mean LDL's of 94.6 and 11 1.9 dB SPL for these respective instructions, which was statistically significant. The hearing-impaired listeners also showed LDL's with Berger's instructions (1 14.7 dB SPL) to be significantly higher than with McCandless' instructional set (109.3 dB SPL). Consequently, this investigation suggests that these two instructional sets may lead to substantially different saturation sound pressure levels. Further studies are needed to determine the most appropriate phraseology for LDL measurement, including the assessment of speech intelligibility at various saturation sound pressure levels. Another instructional set was constructed which (1 )includes an explanation to patients of the purpose and importance of the test, (2) requests listeners to indicate the upper level they are "willing" to listen as opposed to the level they are "able" to listen, (3) instructs patients to search thoroughly around their LDL before making a final judgment, and (4) contains a statement that the LDL should be made with the undgrstanding that the speech could be listened to for a period of time. Whatever instructions are used, clinicians are advised to interpret their LDL's very cautiously until validational studies are available.

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“…Mechanical and electrical stimulation of the utricle were studied by SZENTAGOTHAI (1952) and OWADA et al(1960, and more recently by FLUUR and MELLSTROM (1970a, b) and GERNANDT (1970). Effects of mechani-…”

mentioning

confidence: 99%

An Electrophysiological Study of the Sacculo-Ocular Pathways in Cats

Hwang

Poon

1975

Jpn.J.Physiol

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Microelectrode recordings of neuronal activities in the cat were made in the vestibular main nuclei and the y group cells in response to stimulation of the saccule and IIIrd (oculomotor) nuclei. A relatively new anaesthetic (Ketalar, Parke Davis Co.) that apparently did not suppress transmissions through the sacculo-oculomotor pathways was used. A special accessory arm to replace one side of the standard stereotaxic frame was designed to permit surgical access to the inner ear. Orthodromic focal potentials indicating monosynaptic activation were recorded in the region of the lateral and inferior vestibular nuclei in response to ipsilateral stimulation of saccule. Antidromic field potentials in response to IIIrd nuclear stimulation were also recorded. Similar results were obtained from the y group cells. Unit recordings demonstrated that neurones in the rostral part of the lateral vestibular nucleus received monosynaptic excitation from the saccule before projecting to the IIIrd nuclei. However, studies on the y group cells indicated the existence of a separate and distinct pathway in the sacculo-oculomotor reflex. This pathway involves at least three synapses before reaching the motoneurones.Although eye movements induced by otolith organs stimulation have been known for many years, there have been few reports on the activities evoked in the eye muscles or their motoneurones by selective stimulation of the utricle or saccule in mammals (BARANY, 1906;BREUER, 1891;DE KLEYN and MAGNUS, 1920;KUBO, 1906). Mechanical and electrical stimulation of the utricle were studied by SZENTAGOTHAI (1952) and OWADA et al.(1960, and more recently by FLUUR and MELLSTROM (1970a, b) and GERNANDT (1970). Effects of mechani-

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The Influence of the Utricle on Nystagmus

Cited by 28 publications

References 6 publications

Four Channel Electronystagmographic (ENG) Studies of Eye Movements Induced by Linear Accelerations

Four Channel Electronystagmographic (ENG) Studies of Eye Movements Induced by Linear Accelerations

Loudness Discomfort Level for Speech

An Electrophysiological Study of the Sacculo-Ocular Pathways in Cats

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