نتایج جستجو برای: evoked response variability

تعداد نتایج: 1164419  

Journal: :medical journal of islamic republic of iran 0
a a. asgari from the department of physiology, baghiyatollah university of medical sciences, tehran ai weir the •wellcome biomagnetism unit. department of clinical neurophysiology, lnstitute of neurological sciences, southern general hospital, glasgow, uk.

the second somatosensory area (sli) has been studied both by electrical evoked potentials24 and magnetoencephalography (meg)5 magnetic evoked fields of contralateral primary somatosensory and ipsilateral second somatosensory cortices of 12 normal subjects were recorded in response to median nerve electrical stimulation by means of a single magnetometer. we detected. in addition to the usual con...

Journal: :Journal of cognitive neuroscience 2014
A. Dilene van Campen Max C. Keuken Wery P. M. van den Wildenberg K. Richard Ridderinkhof

Goal-directed action control comes into play when selecting between competing action alternatives. Response capture reflects the susceptibility of the motor system to incitement by task-irrelevant action impulses; the subsequent selective suppression of incorrect action impulses aims to counteract response capture and facilitate the desired response. The goal of this experiment was to clarify p...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 2005
Adam Kohn Matthew A Smith

Nearby cortical neurons often have correlated trial-to-trial response variability, and a significant fraction of their spikes occur synchronously. These two forms of correlation are both believed to arise from common synaptic input, but the origin of this input is unclear. We investigated the source of correlated responsivity by recording from pairs of single neurons in primary visual cortex of...

Journal: :Journal of the American Academy of Audiology 2009
Fawen Zhang Ravi N Samy Jill M Anderson Lisa Houston

BACKGROUND It has been theorized that neural recovery is related to temporal coding of speech sounds. The recovery function of cortically generated auditory evoked potentials has not been investigated in cochlear implant (CI) users. PURPOSE This study characterized the recovery function of the late auditory evoked potential (LAEP) using a masker-probe paradigm in postlingually deafened adult ...

2016
Shuzo Sakata

Ongoing spontaneous activity in cortical circuits defines cortical states, but it still remains unclear how cortical states shape sensory processing across cortical laminae and what type of response properties emerge in the cortex. Recording neural activity from the auditory cortex (AC) and medial geniculate body (MGB) simultaneously with electrical stimulations of the basal forebrain (BF) in u...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 2009
Chad M Sylvester Gordon L Shulman Anthony I Jack Maurizio Corbetta

Covert attention is associated with prestimulus blood oxygenation level-dependent (BOLD) modulations in visual cortex. In some situations, this preparatory activity can predict how well human subjects will perceive upcoming visual objects. Preparatory activity may mediate this behavioral effect by affecting the stimulus-evoked response, but the relationship between preparatory and stimulus-evok...

Davood Fathi, Farzad Fatehi, Narges Khodaparast, Nazila Malekian, Shahram Oveisgharan, Siamak Abdi, Zahra Vahabi,

Background: Alzheimer dementia as the most common cause of dementia is a chronic, progressive, irreversible and incurable disease. The second most common cause of dementia after Alzheimer is vascular dementia. One of the systems involved in dementia is the visuospatial system and visual evoked potential (VEP) can be one of the diagnostic methods for this disease. Therefore, the present study ai...

Journal: :J. Scheduling 2007
Albert Corominas Wieslaw Kubiak Natalia Moreno Palli

This paper presents a work-in-progress on the response time variability problem. This problem occurs whenever events, jobs, clients or products need to be sequenced so as to minimize the variability of time they wait for their next turn in obtaining the necessary resources. The problem has numerous real-life applications, which will be briefly reviewed. The problem has distinctive number theore...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 2003
David Parker

Although synaptic properties are specific to the type of synapse examined, there is evidence to suggest that properties can vary in individual synaptic populations. Here, a large sample of monosynaptic connections made by excitatory interneurons (EINs) onto motor neurons in the lamprey spinal cord locomotor network has been used to examine the properties of a single class of spinal synapse in d...

Journal: :Vision Research 1995
M.H.M. Cuypers J. M. Thijssen R. Bourgonje A.J.L.G. Pinckers A. F. Deutman

The pattern VEP is frequently abnormal in multiple sclerosis. In this disease the VEP latency is prolonged and the amplitude is reduced. The use of the VEP amplitude in diagnosis is limited because of the large interand intrasubject variability and low signal-to-noise ratio (SNR). Goal of this project is to improve the SNR of VEP’s with alternative averaging procedures, and to investigate wheth...

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