scholarly journals A New Model for Utricular Function Testing Using a Sinusoidal Translation Profile during Unilateral Centrifugation

2010 ◽  
Vol 15 (6) ◽  
pp. 343-352 ◽  
Author(s):  
K.I. Buytaert ◽  
S.A.E. Nooij ◽  
X. Neyt ◽  
P.-F. Migeotte ◽  
R. Vanspauwen ◽  
...  
Keyword(s):  
New Model ◽  
Unilateral Centrifugation ◽  
Function Testing ◽  
Utricular Function

Reliability of utricular function testing using a sinusoidal translation profile during unilateral centrifugation

2010 ◽  
Vol 36 (3) ◽  
pp. 274-281
Author(s):  
K. I. Buytaert ◽  
R. Vanspauwen ◽  
P. H. Van de Heyning ◽  
F. L. Wuyts
Keyword(s):  
Unilateral Centrifugation ◽  
Function Testing ◽  
Utricular Function

Ocular and cervical vestibular evoked myogenic potentials in response to bone-conducted vibration in patients with probable inferior vestibular neuritis

2012 ◽  
Vol 126 (7) ◽  
pp. 683-691 ◽  
Author(s):  
L Manzari ◽  
A M Burgess ◽  
I S Curthoys
Keyword(s):  
Sense Organ ◽  
Vestibular Neuritis ◽  
Vestibular Evoked Myogenic Potentials ◽  
Detectable Effect ◽  
Vestibular Evoked Myogenic Potential ◽  
Previous Evidence ◽  
Surface Electrodes ◽  
Myogenic Potential ◽  
Function Testing ◽  
Utricular Function

AbstractBackground and aims:Previous evidence shows that the n10 component of the ocular vestibular evoked myogenic potential indicates utricular function, while the p13 component of the cervical vestibular evoked myogenic potential indicates saccular function. This study aimed to assess the possibility of differential utricular and saccular function testing in the clinic, and whether loss of saccular function affects utricular response.Methods:Following vibration conduction from the mid-forehead at the hairline, the ocular n10 component was recorded by surface electromyograph electrodes beneath both eyes, while the cervical p13–n23 component was recorded by surface electrodes over the tensed sternocleidomastoid muscles.Results:Fifty-nine patients were diagnosed with probable inferior vestibular neuritis, as their cervical p13–n23 component was asymmetrical (i.e. reduced or absent on the ipsilesional side), while their ocular n10 component was symmetrical (i.e. normal beneath the contralesional eye).Conclusion:The sense organ responsible for the cervical and the ocular vestibular evoked myogenic potentials cannot be the same, as one response was normal while the other was not. Reduced or absent saccular function has no detectable effect on the ocular n10 component. On vibration stimulation, the ocular n10 component indicates utricular function and the cervical p13–n23 component indicates saccular function.

Unilateral examination of utricle and saccule function

2003 ◽  
Vol 13 (4-6) ◽  
pp. 215-225
Author(s):  
A.H. Clarke ◽  
U. Schönfeld ◽  
K. Helling
Keyword(s):  
Animal Studies ◽  
Rotation Axis ◽  
Vertical Axis ◽  
Vestibular Evoked Myogenic Potentials ◽  
Caloric Test ◽  
Visual Vertical ◽  
Unilateral Centrifugation ◽  
Axis Rotation ◽  
First Time ◽  
Utricular Function

Attention is directed towards the recently developed unilateral tests of saccular and utricular function. Together with the now widely used head-thrust test and the standard caloric test for semicircular canal function, these provide for a more comprehensive unilateral examination of labyrinth function. The efficacy of vestibular evoked myogenic potentials (VEMP) as a direct unilateral test of saccular function is currently being demonstrated in an increasing number of reports. Furthermore, the relevant neuronal pathways have been delineated in animal studies, so that all evidence points to the validity of the VEMP as a saccule-mediated response. Concerning utricular function, considerable headway has been made using the unilateral centrifugation paradigm. Testing is performed with a variable radius rotary chair with constant velocity rotation about the earth-vertical axis. Displacing the head by 3.5–4 cm from the rotation axis, the eccentrically positioned utricle is stimulated unilaterally by the resultant centrifugal force. This paradigm can be employed to elicit a utriculo-ocular response (UOR) or to permit measurement of the subjective visual vertical (SVV). More recently, it has also been demonstrated that testing during normal, on-centre yaw axis rotation is often sufficient to localise peripheral otolith dysfunction by means of SVV estimation. This test mode can be easily integrated into routine clinical testing. To illustrate the efficacy of such differential testing, the findings from two patients are presented that demonstrate for the first time an isolated unilateral utricular dysfunction.

The Hitachi Model HS-8 Electron Microscope

1967 ◽  
Vol 25 ◽  
pp. 238-239
Author(s):  
H. Akabori ◽  
K. Nishiwaki ◽  
K. Yoneta
Keyword(s):  
Electron Microscope ◽  
New Model ◽  
Predecessor Model

By improving the predecessor Model HS- 7 electron microscope for the purpose of easier operation, we have recently completed new Model HS-8 electron microscope featuring higher performance and ease of operation.

516: A Simplified Method to Estimate the Absolute Renal Uptake of 99MTC-DMSA: Evaluation with a New Model using the Radioactivity of Nephrectomy Specimens as Reference

2005 ◽  
Vol 173 (4S) ◽  
pp. 140-141
Author(s):  
Mariana Lima ◽  
Celso D. Ramos ◽  
Sérgio Q. Brunetto ◽  
Marcelo Lopes de Lima ◽  
Carla R.M. Sansana ◽  
...  
Keyword(s):  
New Model ◽  
Renal Uptake ◽  
Simplified Method ◽  
The Absolute

Analyzing Stochastic Dependence of Cognitive Processes in Multidimensional Source Recognition

2014 ◽  
Vol 61 (5) ◽  
pp. 402-415 ◽  
Author(s):  
Thorsten Meiser
Keyword(s):  
Cognitive Processes ◽  
Model Complexity ◽  
Multinomial Model ◽  
Stochastic Dependence ◽  
New Model ◽  
Multinomial Processing Tree ◽  
Cognitive States ◽  
The Family ◽  
Tree Models ◽  
Flexible Framework

Stochastic dependence among cognitive processes can be modeled in different ways, and the family of multinomial processing tree models provides a flexible framework for analyzing stochastic dependence among discrete cognitive states. This article presents a multinomial model of multidimensional source recognition that specifies stochastic dependence by a parameter for the joint retrieval of multiple source attributes together with parameters for stochastically independent retrieval. The new model is equivalent to a previous multinomial model of multidimensional source memory for a subset of the parameter space. An empirical application illustrates the advantages of the new multinomial model of joint source recognition. The new model allows for a direct comparison of joint source retrieval across conditions, it avoids statistical problems due to inflated confidence intervals and does not imply a conceptual imbalance between source dimensions. Model selection criteria that take model complexity into account corroborate the new model of joint source recognition.

From Harm to Help: A New Model of Feminist Therapy

1986 ◽  
Vol 31 (2) ◽  
pp. 108-109
Author(s):  
Alexandra G. Kaplan
Keyword(s):  
Feminist Therapy ◽  
New Model

The Promise of a New Model of Theistic Psychology

PsycCRITIQUES ◽  
2004 ◽  
Vol 49 (Supplement 13) ◽  
Author(s):  
Paul E. Priester
Keyword(s):  
New Model
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