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Articles 181 - 197 of 197
Full-Text Articles in Medical Neurobiology
Identifying Placebo Effects With Data From Clinical Trials, Anup Malani
Identifying Placebo Effects With Data From Clinical Trials, Anup Malani
Anup Malani
A medical treatment is said to have placebo effects if patients who are optimistic about the treatment respond better to the treatment. This paper proposes a simple test for placebo effects. Instead of comparing the treatment and control arms of a single trial, one should compare the treatment arms of two trials with different probabilities of assignment to treatment. If there are placebo effects, patients in the higher-probability trial will experience better outcomes simply because they believe that there is a greater chance of receiving treatment. This paper finds evidence of placebo effects in trials of antiulcer and cholesterol-lowering drugs.
From Faculty For Undergraduate Neuroscience: Encouraging Innovation In Undergraduate Neuroscience Education By Supporting Student Research And Faculty Development, Eric Wiertelak, J. C. Hardwick, M. Kerchner, B. Lom, J. J. Ramirez
From Faculty For Undergraduate Neuroscience: Encouraging Innovation In Undergraduate Neuroscience Education By Supporting Student Research And Faculty Development, Eric Wiertelak, J. C. Hardwick, M. Kerchner, B. Lom, J. J. Ramirez
Eric Wiertelak
No abstract provided.
Alcohol Withdrawal Seizures, Michael A. Rogawski, Prosper N'Gouemo
Alcohol Withdrawal Seizures, Michael A. Rogawski, Prosper N'Gouemo
Michael A. Rogawski
No abstract provided.
The Neurobiology Of Antiepileptic Drugs For The Treatment Of Nonepileptic Conditions, Michael A. Rogawski, Wolfgang Löscher
The Neurobiology Of Antiepileptic Drugs For The Treatment Of Nonepileptic Conditions, Michael A. Rogawski, Wolfgang Löscher
Michael A. Rogawski
Antiepileptic drugs (AEDs) are commonly prescribed for nonepileptic conditions, including migraine headache, chronicneuropathic pain, mood disorders, schizophrenia and various neuromuscular syndromes. In many of these conditions, as in epilepsy, the drugs act by modifying the excitability of nerve (or muscle) through effects on voltage-gated sodium and calciumchannels or by promoting inhibition mediated by γ-aminobutyric acid (GABA) A receptors. In neuropathic pain, chronic nerveinjury is associated with the redistribution and altered subunit compositions of sodium and calcium channels that predisposeneurons in sensory pathways to fire spontaneously or at inappropriately high frequencies, often from ectopic sites. AEDs maycounteract this abnormal activity by …
The Neurobiology Of Antiepileptic Drugs, Michael Rogawski, Wolfgang Löscher
The Neurobiology Of Antiepileptic Drugs, Michael Rogawski, Wolfgang Löscher
Michael A. Rogawski
Antiepileptic drugs (AEDs) provide satisfactory control of seizures for most patients with epilepsy. The drugs have the remarkable ability to protect against seizures while permitting normal functioning of the nervous system. AEDs act on diverse molecular targets to selectively modify the excitability of neurons so that seizure-related firing is blocked without disturbing non-epileptic activity. This occurs largely through effects on voltage-gated sodium and calcium channels, or by promoting inhibition mediated by GABA-A (γ-aminobutyric acid, type A) receptors. The subtle biophysical modifications inchannel behaviour that are induced by AEDs are often functionally opposite to defects in channel properties that are caused …
Neurosteroids: Endogenous Modulators Of Seizure Susceptibility, Michael A. Rogawski, Doodipala S. Reddy
Neurosteroids: Endogenous Modulators Of Seizure Susceptibility, Michael A. Rogawski, Doodipala S. Reddy
Michael A. Rogawski
No abstract provided.
Assessing Brain Activity Using Spatial Bayesian Variable Selection, Michael Smith, B Putz, D Auer, Ludwig Fahrmeir
Assessing Brain Activity Using Spatial Bayesian Variable Selection, Michael Smith, B Putz, D Auer, Ludwig Fahrmeir
Michael Stanley Smith
Statistical parametric mapping (SPM), relying on the general linear model and classical hypothesis testing, is a benchmark tool for assessing human brain activity using data from fMRI experiments. Friston et al. (Neuroimage 16 (2002a), 484) discuss some limitations of this frequentist approach and point out promising Bayesian perspectives. In particular, a Bayesian formulation allows explicit modeling and estimation of activation probabilities. In this study, we directly address this issue and develop a new regression based approach using spatial Bayesian variable selection. Our method has several advantages. First, spatial correlation is directly modeled for activation probabilities and indirectly for activation amplitudes. …
Principles Of Antiepileptic Drug Action, Michael Rogawski
Principles Of Antiepileptic Drug Action, Michael Rogawski
Michael A. Rogawski
No abstract provided.
Epilepsy (Ionotropic Glutamate Receptors As Therapeutic Targets), Wolfgang Löscher, Michael A. Rogawski
Epilepsy (Ionotropic Glutamate Receptors As Therapeutic Targets), Wolfgang Löscher, Michael A. Rogawski
Michael A. Rogawski
No abstract provided.
Neuromotor And Cognitive Development In Children With Cerebral Palsy In Relation To Neural Plasticity, Vaniecea Pollard
Neuromotor And Cognitive Development In Children With Cerebral Palsy In Relation To Neural Plasticity, Vaniecea Pollard
McCabe Thesis Collection
Infants with neurological disabilities, such as cerebral palsy (CP) and Down syndrome (DS), show severe delays in motor and cognitive development relative to chronological age. Involvement of neural plasticity as a treatment of such neurological disorders is increasingly being seen. Previous studies have found that interventions involving sensory linked motor performance have been critical in facilitating motor improvement. The purpose of this study was to compare self-initiated mobility in children with CP and DS. Three infants, ages 8, 9, and 22 months, with diagnoses of no CP, DS, and CP respectively, participated in the study. The infants were videotaped in …
Role Of Ampa And Glur5 Kainate Receptors In The Development And Expression Of Amygdala Kindling In The Mouse, Michael A. Rogawski, Philip S. Kurzman, Shun-Ichi Yamaguchi, He Li
Role Of Ampa And Glur5 Kainate Receptors In The Development And Expression Of Amygdala Kindling In The Mouse, Michael A. Rogawski, Philip S. Kurzman, Shun-Ichi Yamaguchi, He Li
Michael A. Rogawski
The role of AMPA and GluR5-containing kainate receptors in the development and expression of amygdala kindling was examined using the selective 2,3-benzodiazepine AMPA receptor antagonist GYKI 52466 [(1-(4-aminophenyl)-4-methyl-7,8-methylenedioxy-5H-2, 3-benzodiazepine] and the decahydroisoquinoline mixed AMPA receptor and GluR5 kainate receptor antagonist LY293558 {(3S,4aR,6R, 8aR)-6-[2-(1(2)H-tetrazole-5-yl)ethyl]decahydroisoquinoline- 3-carboxy lic acid)}. Administration of GYKI 52466 (5-40 mg/kg, intraperitoneally) and LY293558 (10-40 mg/kg, intraperitoneally) prior to daily kindling stimulation in mice produced a dose-dependent suppression of the rate of development of behavioral kindled seizure activity and reduced the duration of the stimulation-induced electrographic afterdischarge. In drug-free stimulation sessions after the initial drug-treatment sessions, there was an …
Prolonged Cyclooxygenase-2 Induction In Neurons And Glia Following Traumatic Brain Injury In The Rat, K I Strauss, M F Barbe, R M Marshall Demarest, R Raghupathi, S Mehta, R K Narayan
Prolonged Cyclooxygenase-2 Induction In Neurons And Glia Following Traumatic Brain Injury In The Rat, K I Strauss, M F Barbe, R M Marshall Demarest, R Raghupathi, S Mehta, R K Narayan
Rowan-Virtua School of Osteopathic Medicine Faculty Scholarship
Cyclooxygenase-2 (COX2) is a primary inflammatory mediator that converts arachidonic acid into precursors of vasoactive prostaglandins, producing reactive oxygen species in the process. Under normal conditions COX2 is not detectable, except at low abundance in the brain. This study demonstrates a distinctive pattern of COX2 increases in the brain over time following traumatic brain injury (TBI). Quantitative lysate ribonuclease protection assays indicate acute and sustained increases in COX2 mRNA in two rat models of TBI. In the lateral fluid percussion model, COX2 mRNA is significantly elevated (>twofold, p < 0.05, Dunnett) at 1 day postinjury in the injured cortex and bilaterally in the hippocampus, compared to sham-injured controls. In the lateral cortical impact model (LCI), COX2 mRNA peaks around 6 h postinjury in the ipsilateral cerebral cortex (fivefold induction, p < 0.05, Dunnett) and in the ipsilateral and contralateral hippocampus (two- and six-fold induction, respectively, p < 0.05, Dunnett). Increases are sustained out to 3 days postinjury in the injured cortex in both models. Further analyses use the LCI model to evaluate COX2 induction. Immunoblot analyses confirm increased levels of COX2 protein in the cortex and hippocampus. Profound increases in COX2 protein are observed in the cortex at 1-3 days, that return to sham levels by 7 days postinjury (p < 0.05, Dunnett). The cellular pattern of COX2 induction following TBI has been characterized using immunohistochemistry. COX2-immunoreactivity (-ir) rises acutely (cell numbers and intensity) and remains elevated for several days following TBI. Increases in COX2-ir colocalize with neurons (MAP2-ir) and glia (GFAP-ir). Increases in COX2-ir are observed in cerebral cortex and hippocampus, ipsilateral and contralateral to injury as early as 2 h postinjury. Neurons in the ipsilateral parietal, perirhinal and piriform cortex become intensely COX2-ir from 2 h to at least 3 days postinjury. In agreement with the mRNA and immunoblot results, COX2-ir appears greatest in the contralateral hippocampus. Hippocampal COX2-ir progresses from the pyramidal cell layer of the CA1 and CA2 region at 2 h, to the CA3 pyramidal cells and dentate polymorphic and granule cell layers by 24 h postinjury. These increases are distinct from those observed following inflammatory challenge, and correspond to brain areas previously identified with the neurological and cognitive deficits associated with TBI. While COX2 induction following TBI may result in selective beneficial responses, chronic COX2 production may contribute to free radical mediated cellular damage, vascular dysfunction, and alterations in cellular metabolism. These may cause secondary injuries to the brain that promote neuropathology and worsen behavioral outcome.
Of Blind Men And Brain Steroids, Michael A. Rogawski
Of Blind Men And Brain Steroids, Michael A. Rogawski
Michael A. Rogawski
Review of "Neurosteroids: A New Regulatory Function in the Nervous System" (edited by Etiene-Emile Baulieu, Paul Robel and Michael Schumacher), Humana Press, 1999. ISBN 0896 03545X The first recognized example of the profound influence of steroid hormones on the nervous system was perhaps the observation in prehistoric times that animal behaviour changes dramatically during oestrus (the period of female sexual receptivity). In recent years, much specific evidence has accumulated confirming that steroids affect the structure and function of the nervous system through effects on neurogenesis, cell death, cell migration, synapse formation and neuronal excitability.
Ampa Receptors In Epilepsy And As Targets For Antiepileptic Drugs, Michael A. Rogawski, Sean D. Donevan
Ampa Receptors In Epilepsy And As Targets For Antiepileptic Drugs, Michael A. Rogawski, Sean D. Donevan
Michael A. Rogawski
No abstract provided.
Excitatory Amino Acids And Seizures, Michael A. Rogawski
Excitatory Amino Acids And Seizures, Michael A. Rogawski
Michael A. Rogawski
No abstract provided.
Antiepileptic Drugs: Pharmacological Mechanisms And Clinical Efficacy With Consideration Of Promising Developmental Stage Compounds, Michael A. Rogawski, Roger J. Porter
Antiepileptic Drugs: Pharmacological Mechanisms And Clinical Efficacy With Consideration Of Promising Developmental Stage Compounds, Michael A. Rogawski, Roger J. Porter
Michael A. Rogawski
No abstract provided.
Cerebral Anoxia And Its Residuals: Pt. Iii. The Structural Changes, Cyril B. Courville
Cerebral Anoxia And Its Residuals: Pt. Iii. The Structural Changes, Cyril B. Courville
Medical Arts and Sciences: A Scientific Journal of the College of Medical Evangelists
No abstract provided.