scholarly journals The Potential of Trial-by-Trial Variabilities of Ongoing-EEG, Evoked Potentials, Event Related Potentials and fMRI as Diagnostic Markers for Neuropsychiatric Disorders

2019 ◽  
Vol 12 ◽  
Author(s):  
Carlos Trenado ◽  
Anaí González-Ramírez ◽  
Victoria Lizárraga-Cortés ◽  
Nicole Pedroarena Leal ◽  
Elias Manjarrez ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Event Related Potentials ◽  
Neuropsychiatric Disorders ◽  
Diagnostic Markers ◽  
Related Potentials ◽  
Ongoing Eeg

scholarly journals Potenciais evocados auditivos corticais no transtorno do espectro do autismo: revisão sistemática

CoDAS ◽  
2021 ◽  
Vol 33 (2) ◽  
Author(s):  
Mariana Keiko Kamita ◽  
Liliane Aparecida Fagundes Silva ◽  
Carla Gentile Matas
Keyword(s):  
Autism Spectrum Disorder ◽  
Evoked Potentials ◽  
Autistic Disorder ◽  
Web Of Science ◽  
Event Related Potentials ◽  
Autism Spectrum ◽  
Spectrum Disorder ◽  
Cochrane Library ◽  
Related Potentials

RESUMO Objetivo Identificar e analisar quais são os achados característicos dos Potenciais Evocados Auditivos Corticais (PEAC) em crianças e/ou adolescentes com Transtorno do Espectro do Autismo (TEA) em comparação do desenvolvimento típico, por meio de uma revisão sistemática da literatura. Estratégia de pesquisa Após formulação da pergunta de pesquisa, foi realizada uma revisão da literatura em sete bases de dados (Web of Science, Pubmed, Cochrane Library, Lilacs, Scielo, Science Direct, e Google acadêmico), com os seguintes descritores: transtorno do espectro autista (autism spectrum disorder), transtorno autístico (autistic disorder), potenciais evocados auditivos (evoked potentials, auditory), potencial evocado P300 (event related potentials, P300) e criança (child). A presente revisão foi cadastrada no Próspero, sob número 118751. Critérios de seleção Foram selecionados estudos publicados na integra, sem limitação de idioma, entre 2007 e 2019. Análise dos dados: Foram analisadas as características de latência e amplitude dos componentes P1, N1, P2, N2 e P3 presentes nos PEAC. Resultados Foram localizados 193 estudos; contudo 15 estudos contemplaram os critérios de inclusão. Embora não tenha sido possível identificar um padrão de resposta para os componentes P1, N1, P2, N2 e P3, os resultados da maioria dos estudos demonstraram que indivíduos com TEA podem apresentar diminuição de amplitude e aumento de latência do componente P3. Conclusão Indivíduos com TEA podem apresentar respostas diversas para os componentes dos PEAC, sendo que a diminuição de amplitude e aumento de latência do componente P3 foram as características mais comuns.

scholarly journals Single-Trial Evoked Potential Estimating Based on Sparse Coding under Impulsive Noise Environment

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Nannan Yu ◽  
Ying Chen ◽  
Lingling Wu ◽  
Hanbing Lu
Keyword(s):  
Evoked Potentials ◽  
Sparse Coding ◽  
Stable Distribution ◽  
Impulsive Noise ◽  
Event Related Potentials ◽  
Signal Denoising ◽  
Single Trial ◽  
Gaussian Random Process ◽  
Noise Environment ◽  
Related Potentials

Estimating single-trial evoked potentials (EPs) corrupted by the spontaneous electroencephalogram (EEG) can be regarded as signal denoising problem. Sparse coding has significant success in signal denoising and EPs have been proven to have strong sparsity over an appropriate dictionary. In sparse coding, the noise generally is considered to be a Gaussian random process. However, some studies have shown that the background noise in EPs may present an impulsive characteristic which is far from Gaussian but suitable to be modeled by the α-stable distribution 1<α≤2. Consequently, the performances of general sparse coding will degrade or even fail. In view of this, we present a new sparse coding algorithm using p-norm optimization in single-trial EPs estimating. The algorithm can track the underlying EPs corrupted by α-stable distribution noise, trial-by-trial, without the need to estimate the α value. Simulations and experiments on human visual evoked potentials and event-related potentials are carried out to examine the performance of the proposed approach. Experimental results show that the proposed method is effective in estimating single-trial EPs under impulsive noise environment.

scholarly journals Multimodal evoked potential abnormalities in patients with Wilson's disease

2005 ◽  
Vol 133 (7-8) ◽  
pp. 331-337 ◽  
Author(s):  
Tihomir Ilic ◽  
Marina Svetel ◽  
Stevan Petkovic ◽  
Vladimir Kostic
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Evoked Potential ◽  
Wilson’S Disease ◽  
Event Related Potentials ◽  
Wilson's Disease ◽  
Illness Duration ◽  
Functional Systems ◽  
Related Potentials

The aim of this study was to investigate the involvement of the following functional systems: somatosensory evoked potentials (SSEP), visual evoked potentials (VEP), and event related potentials (ERP), in twenty patients with Wilson's disease (WD). VEP and SSEP abnormalities were discovered in S patients respectively (40%), whereas ERP were either absent or, in the case of 10 patients (50%), had significantly prolonged P-300 latencies. Taken together, at least one evoked potential abnormality was discovered in 17 patients (85%]. Only in 3 patients (15%), involving either the isolated hepatic type of disease or short illness duration of the neurological type, were normal evoked potential findings observed. Our findings suggest the usefulness of multimodal evoked potential abnormalities in the evaluation of subclinical manifestations in patients with WD.

Evoked Potentials

2016 ◽  
Author(s):  
Marc R. Nuwer
Keyword(s):  
Evoked Potentials ◽  
Auditory Evoked Potentials ◽  
Motor Evoked Potentials ◽  
Clinical Care ◽  
Event Related Potentials ◽  
Clinical Tests ◽  
Therapeutic Trials ◽  
Complementary Role ◽  
Related Potentials ◽  
Vestibular Evoked Potentials

Visual evoked potentials, brainstem auditory evoked potentials, and somatosensory evoked potentials are established clinical tests that are useful for the diagnosis of multiple sclerosis. Motor evoked potentials, cognitive event-related potentials, and vestibular evoked potentials also are used clinically to test additional pathways and functions. These objective, reproducible tools can identify clinically silent lesions, predict clinical deterioration risk, and localize levels of impairment. They differ from magnetic resonance imaging in that they assess function rather than anatomy and thereby fill a complementary role in clinical care. They also are useful in therapeutic trials because they can predict outcomes in parallel with, or earlier than, clinical examinations.

Difficulties of olfactometric evaluation in patients accusing smell disorders after head trauma

2018 ◽  
Vol 8 (29) ◽  
pp. 39-45
Author(s):  
Gabriela-Violeta Melinte ◽  
Codrut Sarafoleanu
Keyword(s):  
Olfactory Bulb ◽  
Evoked Potentials ◽  
Head Trauma ◽  
Event Related Potentials ◽  
Assessment Method ◽  
Olfactory Function ◽  
Function Evaluation ◽  
Time Frequency ◽  
Related Potentials ◽  
Smell Function

Abstract Head trauma is considered to be the third cause of olfactory function disorders. Olfactometric assessment in patients accusing anosmia following head injury produced by car accident or aggression is important, because most of them are involved in law trials in order to obtain financial compensations from the author. It is compulsory to use both subjective and objective olfactory evaluation methods combined with a detailed anamnesis, a complete ENT examination and a good cranio-facial imaging (computed tomography or MRI) in order to exclude malingerers and to obtain an accurate diagnosis. “Sfanta Maria” ENT Department from Bucharest is the only center in Romania where the olfactory function in completely investigated. We use chemosensory (Snap and Sniff Test and n-Butanol Dynamic Olfactometry) and electrophysiological tests (electric olfactory evoked potentials of the olfactory bulb). Unfortunately, we confront with a series of difficulties in what concerns the smell function evaluation: 1) there is scarce information in the literature regarding the olfactory electric evoked potentials; 2) the electric olfactory evoked potentials register only the electrical activity in the olfactory bulb; 3) in case of olfactory impairment medically confirmed, we cannot establish a cause-effect relationship between the disturbance and the event; 4) the most accurate electrophysiological assessment method currently available in Europe is the time-frequency analysis of chemosensory event-related potentials, but we do not dispose of the necessary equipment yet; 5) sometimes patients do not give us the informed consent for a complete olfactory evaluation.

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