نتایج جستجو برای: ocular reflex

تعداد نتایج: 76026  

Journal: :Journal of neurology, neurosurgery, and psychiatry 1973
D Papakostopoulos R Cooper

A method is described which permits simultaneous measurement of changes in slow electroencephalographic potentials (Contingent Negative Variation-CNV) and the excitability of the spinal monosynaptic arc (H reflex) during the foreperiod of a simple reaction time experiment. Data from 11 normal subjects show that during the development of the CNV there is an augmentation of the amplitude of the H...

Journal: :Journal of neurology, neurosurgery, and psychiatry 1978
B Bussel C Morin E Pierrot-Deseilligny

The facilitating effect of the Jendrassik manoeuvre on monosynaptic reflexes in man has been studied by comparing H and T reflexes of the soleus and by blocking the effects of spindle activation by ischaemia of the leg. The Jendrassik manoeuvre equally enhances H and T reflexes provided that the test reflexes are small. The H reflex remains facilitated when the spindle activation cannot affect ...

Journal: :Muscle & nerve 2003
John E Misiaszek

The Hoffmann reflex (H-reflex) is extensively used as both a research and clinical tool. The ease with which this reflex can be elicited in several muscles throughout the body makes it an attractive tool. This review discusses some of the important limitations in using the H-reflex. In particular, the inaccurate but widely held assumptions that the H-reflex (1). represents the monosynaptic refl...

Journal: :Psychophysiology 2009
Jamie L Rhudy Christopher R France Emily J Bartley Klanci M McCabe Amy E Williams

Physiological reactions to noxious stimuli are often used to make inferences about pain, but few studies have thoroughly examined the intra- and interindividual relationships between them. In the present study (N=104), multilevel analyses was used to assess relations between physiological (nociceptive flexion reflex magnitude [NFR], blink reflex magnitude, skin conductance response [SCR], heart...

Journal: :Investigative ophthalmology & visual science 2010
Harumitsu Hirata Ian D Meng

PURPOSE To investigate the response characteristics of the corneal afferents that detect ocular conditions critical to the activation of the "afferent limb" of the lacrimation reflex. METHODS In isoflurane-anesthetized male rats, trigeminal ganglia were explored extracellularly in vivo to identify the corneal neurons that can be activated by ocular stimuli important to lacrimation. After veri...

Journal: :Journal of insect physiology 2001
Amakawa

In some insects the proboscis is extended to imbibe a sugar solution if the concentration of sugar applied to the chemosensilla exceeds the behavioural threshold value. Recently, I found a reversal of the threshold values of this "proboscis extension reflex" (PER) in the blow fly (Phormia regina M.) for glucose and fructose. It depended on maturation and physiological conditions, both of which ...

Journal: :The journals of gerontology. Series A, Biological sciences and medical sciences 1996
J R Burke G Kamen

BACKGROUND Age-related differences in spinal excitability during response preparation were assessed by eliciting either a 50% H-reflex or an Achilles tendon reflex preceding the onset of a right plantar flexion contraction in 20 young adults (23.1 +/- 1.64 yrs) and 20 old adults (68.5 +/- 5.53 yrs). METHODS On each simple reaction time trial, the test reflex was elicited at a specific test in...

Journal: :Journal of neurophysiology 2008
Eric J Perreault Kuifu Chen Randy D Trumbower Gwyn Lewis

The human motor system regulates arm mechanics to produce stable postures during interactions with different physical environments. This occurs partly via involuntary mechanisms, including stretch reflexes. Previous single-joint studies demonstrated enhanced reflex sensitivity during interactions with compliant environments, suggesting reflex gain increases to enhance limb stability when that s...

2011
Yuhua Wang Raymond M. Quock Robert D. Keegan

Background/Aims: The role of nitric oxide (NO) in general anesthetic drug action is controversial. The present study was carried out to determine the role of NO in the loss of righting reflex induced by injectable sedative and

Journal: :Journal of neurophysiology 2009
Sergei B Yakushin Yongqing Xiang Bernard Cohen Theodore Raphan

Little is known about the dependence of the roll angular vestibuloocular reflex (aVOR) on gravity or its gravity-dependent adaptive properties. To study gravity-dependent characteristics of the roll aVOR, monkeys were oscillated about a naso-occipital axis in darkness while upright or tilted. Roll aVOR gains were largest in the upright position and decreased by 7-15% as animals were tilted from...

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