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Topic: Evoked potential


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In the News (Tue 18 Jun 19)

  
  Evoked potential - Wikipedia, the free encyclopedia
In neurophysiology, an evoked potential (or "evoked response") is an electrical potential recorded from a human or animal subject following presentation of a stimulus, as distinct from spontaneous potentials such as electroencephalograms or electromyograms.
Evoked potential amplitudes tend to be low, ranging from less than a microvolt to several microvolts, compared to tens of microvolts for EEG, millivolts for EMG, and often close to a volt for EKG.
Visual evoked potentials may be induced by a flashing light, auditory evoked potentials by the onset of a sound, and somatosensory evoked potentials by a solenoid pulsing against a person's skin.
en.wikipedia.org /wiki/Evoked_potential   (498 words)

  
 Visual evoked potential - Wikipedia, the free encyclopedia
A visual evoked potential (VEP) is an evoked potential caused by sensory stimulation of a subject's visual field.
Visual evoked potentials are also used in the investigation of basic functions of visual perception.
Sometimes, the term "visual evoked cortical potential" (VECP) is used to distinguish the VEP from retinal or subcortical potentials.
en.wikipedia.org /wiki/Visual_evoked_potential   (206 words)

  
 eMedicine - Somatosensory Evoked Potentials: General Principles : Article by Emad Soliman, MD, MSc   (Site not responding. Last check: 2007-11-03)
Somatosensory evoked potentials (SSEPs) to stimulation of the left median nerve, recorded from a ring of electrodes placed around the neck at the level of SC5 posteriorly and the superior border of the thyroid cartilage anteriorly.
Somatosensory evoked potentials (SSEPs) to median nerve stimulation recorded from cortical surface electrodes prior to resection of a right parietal arteriovenous malformation (AVM) in a 35-year-old man. Note the inversion of the N20/P20 component (arrowheads) across the central sulcus; the amplitude is largest over the postcentral gyrus, where the component is negative in polarity.
Desynchronized, polyphasic somatosensory evoked potentials (SSEPs) to posterior tibial nerve stimulation, recorded from the spinal cord during removal of an intradural extramedullary neuroma that was compressing the spinal cord in a 44-year-old woman.
www.emedicine.com /neuro/topic640.htm   (6963 words)

  
 Journal of Neurotherapy (1-3)1- Copyright 1995-2001, JNT   (Site not responding. Last check: 2007-11-03)
Evoked potentials were measured by synchronous filtering of the EEG at the stimulus fundamental and its first harmonic.
Previous studies have made extensive use of "transient" evoked potentials, which are computed by averaging a large number of repetitive responses to separate the desired signal from concurrent "noise." While this technique has provided some insight into the brain mechanisms, it has the fundamental inability to track short-term changes in brain state.
The evoked potential results were analyzed as follows: The waveform data from the first 30 seconds of a run were discarded to remove the effects of filter rise-time, initial eye movements, and other transient events.
www.snr-jnt.org /journalnt/jnt(1-3)1.html   (2887 words)

  
 Evoked Potential Responses
Evoked Potential Responses are minute electrical signals generated by the brain and spinal cord when transmitting and processing responses to sensory stimuli.
Visual evoked responses are usually elicited by having the subject look at an alternating checkerboard pattern on a TV screen and measuring a response from an electrode on the scalp applied with a water soluble paste.
Somatosensory evoked responses are usually measured from a series of brief electrical shocks in the arms and legs and may be measured from the scalp, at points along the spine, or both.
www.neurobc.com /Neurological_Tests/EVP.htm   (400 words)

  
 Evoked Potential Measurements for Erectile Dysfunction
Dorsal nerve somatosensory evoked potential testing involves the electrical stimulation of the dorsal nerve of the penis and the recording of evoked potential waveforms over the sacral cord or cerebral cortex.
Evoked potential measurements for the diagnosis of erectile dysfunction is considered not medically necessary.
The clinical usefulness of penile evoked potential measurements is limited by the poor discriminatory value of response latencies.
www.bcbst.com /MPManual/Evoked_Potential_Measurements_for_Erectile_Dysfunction.htm   (429 words)

  
 Evoked Potential Studies | AHealthyMe.com
Evoked potential studies are a group of tests of the nervous system that measure electrical signals along the nerve pathways.
Visual evoked potentials are used to diagnose visual losses due to optic nerve damage, especially from multiple sclerosis.
Somatosensory evoked potentials record transmission of nerve impulses from the limbs to the brain, and can be used to diagnose nerve damage or degeneration within the spinal cord or nerve roots from multiple sclerosis, trauma, or other degenerative disease.
www.ahealthyme.com /topic/topic100586793   (833 words)

  
 Jrcreations's somata sensory evoked potential monitoring   (Site not responding. Last check: 2007-11-03)
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jrcreations.com /somata-sensory-evoked-potential-monitoring   (5309 words)

  
 Cognitive Evoked Potential Testing
An evoked potential test is an electrical manifestation of the brain’s reception of and response to an external stimulus.
Cognitive evoked potential tests, also known as the P300 or P3, have been used in investigational settings to attempt to correlate changes in cognitive evoked potentials with clinical changes in cognitive function in patients with dementia and in attempting to identify the etiology of depression in patients with chronic demyelinating disease.
Due to a lack of scientific evidence concerning the effect on treatment decisions and health outcomes of patients and the lack of studies comparing cognitive evoked potential tests with standard neuropsychiatric and psychometric tests used in diagnosing cognitive dysfunction, the technology assessment criteria are not met.
www.regence.com /trgmedpol/medicine/med38.html   (490 words)

  
 eMedicine - Clinical Utility of Evoked Potentials : Article by Leslie Huszar, MD   (Site not responding. Last check: 2007-11-03)
The usual VEPs are evoked by checkerboard stimulation and, because cells of the visual cortex are maximally sensitive to movement at the edges, a pattern-shift method is used with a frequency of 1-2 Hz.
Comparisons of the 3 evoked potential stimulus modalities have found visual and somatosensory testing to be of approximately equal sensitivity for revealing clinically unsuspected lesions, with auditory testing being one half to one third less sensitive; the 3 tests are complementary.
Recording motor evoked potential (MEP) and SEP during thoracoabdominal aortic surgery to assess ischemia of spinal cord has been valued by a number of authors as a procedure to lower risk of postoperative neurological injury.
www.emedicine.com /neuro/topic69.htm   (10301 words)

  
 Encyclopedia of Nursing and Allied Health: Evoked potential studies
Sensory evoked potential (EP) studies are the measurement of the electrical response of nervous tissue to auditory, visual, and somatosensory stimulation.
EP studies, also known as evoked responses, measure the very faint electrical response of the brain, brainstem, or peripheral nerves to a mild stimulus, displaying it as a wave on a paper strip or computer monitor.
Evoked potential studies are often performed by specially trained electrodiagnostic technologists.
www.findarticles.com /p/articles/mi_gGENH/is_/ai_2699003285   (1154 words)

  
 Evoked potential testing for multiple sclerosis - [Medical Test]
Evoked potential testing measures the time it takes for nerves to respond to stimulation.
Somatosensory evoked response or potential (SSER or SSEP), which is when the nerves of the arms and legs are stimulated by an electrical pulse.
The visual evoked response (VER) is the most commonly used evoked potential test in the diagnosis of multiple sclerosis (MS).
www.bchealthguide.org /kbase/topic/detail/test/hw190600/detail.htm   (467 words)

  
 Evoked Potential Website   (Site not responding. Last check: 2007-11-03)
An evoked potential is also known as an evoked response.
When certain types of symptoms present themselves, an evoked potential study can be performed to measure the health of this circuitry.
An evoked potential will allow you to see if there has been a "block" along the pathways that lead to the brain.
clients.teksavvy.com /~dg/ep/home.html   (543 words)

  
 Evoked potential - Time Varying Filters for Estimation of Evoked PotentialsePrints   (Site not responding. Last check: 2007-11-03)
Systematics of the Evoked Somatosensory Cortical Potential the complex waveform which the authors consider to be representative of the evoked potential.
Evoked potential amplitudes tend to be low, ranging from less than a microvolt Usually the term "evoked potential" is reserved for responses involving
evoked potential In neurophysiology, an evoked potential (or "evoked response") is an electrical potential recorded from a human or animal subject.
hearing-aids.yoursuperengine.com /q/hearing-aids-evoked-potential.htm   (636 words)

  
 [No title]   (Site not responding. Last check: 2007-11-03)
The head model is used to determine the extracellular potential produced by those transmembrane currents and is based on the electrical conductivity distribution within the head.
Melcher also measuree the extracellular potentials produced by individual brainstem cells in cats using the method of spike-triggered averaging; spikes from single cells and extracellular potentials are recorded simultaneously and the portion of the extracellular potential time- locked to individual spikes is extracted by averaging.
The head model is used to determine the extracellular potential produced by a cell based on the output of the cell model.
web7.mit.edu /HSTSHS/postdocs/jmelcher.html   (999 words)

  
 VAX-D Research - Dermatomal Somatosensory Evoked Potential Demonstration of Nerve Root Decompression after VAX-D Therapy
Dermatomal somatosensory evoked potentials (DSSEPs) are an established and effective physiologic tool for assessing single nerve root function pre- and post- operatively (6,7,8,9,10,11) and are useful as well for monitoring potential acute nerve root injury during surgical procedures using intrapedicular fixation of the lumbosacral spine (12).
Responses of greatest amplitude are possible by this arrangement of scalp electrode placement because the potentials are being measured in the vicinity of the sensory cortex contralateral to the side of the stimulus.
Dermatomal somatosensory evoked potentials in the diagnosis of lumbar root entrapment.
www.vaxd.net /Naguszewski.htm   (5865 words)

  
 Diagnosing Multiple Sclerosis (MS): Evoked Potential Tests -- WebMD
Evoked potential tests measure electrical activity in certain areas of the brain in response to stimulation of certain groups of nerves.
Visual Evoked Potentials (VEP): You sit in front of a screen on which an alternating checkerboard pattern is displayed.
Evoked potentials are recorded by placing wires with stimulators on the scalp over the areas of the brain.
my.webmd.com /content/article/57/66116   (305 words)

  
 Evoked Potentials   (Site not responding. Last check: 2007-11-03)
Evoked potentials, sometimes called evoked responses, are tests that record the brain's responses to sound, touch, and light.
Somatosensory Evoked Potential (SSEP) You may be asked to disrobe and put on a hospital gown during the SSEP.
Visual Evoked Potential (VEP) During the VEP, you will be asked to sit in a chair and watch a television screen displaying a checkerboard pattern.
www.cinn.org /isc/tests/evokedpotentials.html   (347 words)

  
 The Differential Diagnostic Somatosensory Evoked Potential: a Critical Appraisal of a New Electrodiagnostic Technique | ...
Since it utilizes somatosensory evoked potential technology, the DDSSEP is being marketed as an improvement of a medically accepted and scientifically validated diagnostic procedure.
In reviewing the literature regarding the use of SEPS and DSEPs for the detection of radiculopathies, it became clear that these evoked potentials were not quite as sensitive in the detection of radiculopathies as had been initially thought or hoped for.
Somatosensory evoked potential to peroneal nerve stimulation in patients with herniated lumbar disc.
www.chiroweb.com /archives/13/07/15.html   (2069 words)

  
 UMHS - Evoked Potential Tests
If you are having a visual evoked potential test, you will be asked to focus on the center of a checkerboard pattern that is shifting back and forth.
If you are having a brain stem auditory evoked potential test, you will have a brief hearing test followed by a series of clicks in each ear, one at a time.
If you are having a somatosensory (soh-mah-tah-SINS-or-ee) evoked potential test, you will feel a slight tingling in your hand or foot that may cause your fingers or toes to wiggle.
www.med.umich.edu /1libr/tests/teste04.htm   (473 words)

  
 Neurology - Evoked Potential Tests   (Site not responding. Last check: 2007-11-03)
Visual evoked potentials test the visual pathways between the retina (eye) and the brain by presenting alternating checkerboard patterns
Somatosensory evoked potentials test the pathways between the peripheral nerves through the spine to the brain by stimulating nerves with small electrical pulses
Evoked responses may reveal slight damage to the optic nerve (the nerve to the eyes) in a person with multiple sclerosis.
www.csmc.edu /pf_3022.html   (119 words)

  
 Title page for ETD etd-04152004-232920 ( Browse | Search ) All Available ETDs
Evoked potentials are defined as potentials that are caused by the electrical activity in the central nervous system after a stimulation.In analysis of evoked potentials the main problem is to extract waveform from the measurements that also contain on-going background electroencephalogram (EEG).
The most conventional tool for the analysis of evoked potentials has been the averaging of the measurements over an ensemble of trials.
This is the optimal way to improve the signal-to-noise ratio when the evoked potential is a deterministic signal in independent and additive background noise of zero mean.
etd.library.pitt.edu /ETD/available/etd-04152004-232920   (205 words)

  
 American Family Physician: Visual evoked potential test in diagnosis of migraine - Tips From Other Journals - Lancet, ...
The use of visual evoked potential studies in the diagnosis of migraine headache has been advocated by one group of investigators, who reported that this technique had a sensitivity of 90 percent and a specificity of 89 to 96 percent.
The technique is based on peak-to-peak measurements of fast electroencephalographic activity in the background during a visual evoked potential test.
The authors believe that visual evoked potential testing is not useful in the diagnosis of migraine headache.
www.findarticles.com /p/articles/mi_m3225/is_n1_v44/ai_11135438   (331 words)

  
 National MS Society | Sourcebook: Evoked Potentials   (Site not responding. Last check: 2007-11-03)
Evoked potential (EP) tests measure electrical activity in particular areas of the brain in response to stimulation of specific sensory nerve pathways.
In order to measure evoked potentials, wires are placed on the scalp over the areas of the brain being tested.
Evoked potential testing is harmless, painless, and very sensitive in detecting lesions—or damaged areas.
www.nationalmssociety.org /Sourcebook-Evoked.asp   (401 words)

  
 Olfactory evoked potential produced by electrical stimulation of the human olfactory mucosa -- Ishimaru et al. 22 (1): ...
Olfactory evoked potential produced by electrical stimulation of the human olfactory mucosa -- Ishimaru et al.
Olfactory evoked potential produced by electrical stimulation of the human olfactory mucosa
This evoked potential was considered to be the human olfactory
chemse.oxfordjournals.org /cgi/content/abstract/22/1/77   (330 words)

  
 WHAT ARE AUDITORY EVOKED POTENTIALS AND AUDITORY EVENT-RELATED POTENTIALS?
This event may be a sensory stimulus (such as a visual flash or an auditory sound), a mental event (such as recognition of a specified target stimulus), or the omission of a stimulus (such as an increased time gap between stimuli).
AEPs (and ERPs) are very small electrical voltage potentials originating from the brain recorded from the scalp in response to an auditory stimulus (such as different tones, speech sounds, etc.).
A very different type of auditory evoked potential are the Auditory Steady-State Responses (ASSR), which are responses to stimuli presented at rates such that the brain response to one stimulus is overlapped with responses to other stimuli.
www.audiospeech.ubc.ca /haplab/aep.htm   (1134 words)

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