Low-frequency oscillations in human tibial somatosensory evoked potentials

Tierra-Criollo, Carlos Júlio; Infantosi, Antonio Fernando Catelli

doi:10.1590/s0004-282x2006000300010

Cited by 12 publications

(9 citation statements)

References 27 publications

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“…These findings, particularly the gamma band, are consistent with the results of tibial nerve stimulation reported by Tierra-Criollo and Infantosi (16). Using the MSC with M = 800, the 30-to 58-Hz frequency range made the highest contribution to SEP morphology (data not shown).…”

Section: Discussionsupporting

confidence: 90%

“…This procedure is in accordance with the results of Tierra-Criollo and Infantosi (16), who reported that the more important stimulus artifact effect occurs up to 5 ms.…”

Section: Somatosensory Stimulation and Eeg Acquisitionsupporting

confidence: 92%

“…Different signal processing techniques, such as time-frequency analysis (14) and spectral analysis (15,16), have been applied to identify gamma oscillations. Spectral coherence was applied to the EEG during auditory stimulation (10) and also to the magnetoencephalogram during sleep states (25) and somatosensory stimulation (26).…”

Section: Discussionmentioning

confidence: 99%

“…Hence, the knowledge of which frequencies (oscillations) better characterize the EEG activity during sensory stimulation is a requirement for clinical application, mainly for monitoring purposes. Oscillations within the gamma band (30-100 Hz) have been observed in many different neurophysiological states and experimental protocols using auditory (14), visual (15) or somatosensory stimulation (16). Nevertheless, a narrow frequency band has not been determined for human beings during somatosensory stimulation.…”

Section: Introductionmentioning

confidence: 99%

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Use of magnitude-squared coherence to identify the maximum driving response band of the somatosensory evoked potential

Infantosi

Melges

Tierra-Criollo

2006

Braz J Med Biol Res

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The present study proposes to apply magnitude-squared coherence (MSC) to the somatosensory evoked potential for identifying the maximum driving response band. EEG signals, leads [Fpz'-Cz'] and [C3'-C4'], were collected from two groups of normal volunteers, stimulated at the rate of 4.91 (G1: 26 volunteers) and 5.13 Hz (G2: 18 volunteers). About 1400 stimuli were applied to the right tibial nerve at the motor threshold level. After applying the anti-aliasing filter, the signals were digitized and then further low-pass filtered (200 Hz, 6th order Butterworth and zero-phase). Based on the rejection of the null hypothesis of response absence (MSC( f ) > 0.0060 with 500 epochs and the level of significance set at α = 0.05), the beta and gamma bands, 15-66 Hz, were identified as the maximum driving response band. Taking both leads together ("logical-OR detector", with a falsealarm rate of α = 0.05, and hence α = 0.0253 for each derivation), the detection exceeded 70% for all multiples of the stimulation frequency within this range. Similar performance was achieved for MSC of both leads but at 15, 25, 35, and 40 Hz. Moreover, the response was detected in [C3'-C4'] at 35.9 Hz and in [Fpz'-Cz'] at 46.2 Hz for all members of G2. Using the "logical-OR detector" procedure, the response was detected at the 7th multiple of the stimulation frequency for the series as a whole (considering both groups). Based on these findings, the MSC technique may be used for monitoring purposes.

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Section: Discussionsupporting

confidence: 90%

“…This procedure is in accordance with the results of Tierra-Criollo and Infantosi (16), who reported that the more important stimulus artifact effect occurs up to 5 ms.…”

Section: Somatosensory Stimulation and Eeg Acquisitionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of magnitude-squared coherence to identify the maximum driving response band of the somatosensory evoked potential

Infantosi

Melges

Tierra-Criollo

2006

Braz J Med Biol Res

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“…Com vistas à rejeição de artefatos, utilizouse um algoritmo de remoção automática 20,21 , havendo ainda a opção de rejeição manual. Os 16 segmentos restantes de cada condição foram divididos em épocas de 5 s de duração com um total de 1200 amostras, sendo o início de cada uma sincronizada pelo sinal sonoro indicativo do início de cada IM.…”

Section: Métodounclassified

Alterações na banda alfa do eletrencefalograma durante imagética motora visual e cinestésica

Stecklow

Infantosi

Cagy

2007

Arq. Neuro-Psiquiatr.

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RESUMO -Foi investigada a contribuição em potência na vizinhança do pico da banda alfa (BPA) do EEG durante imagética motora (IM). Sinais EEG (derivações occipitais e parietais) foram adquiridos em sujeitos destros (18-40 anos), durante repouso (ESP) e IM nas modalidades cinestésica (IMC) e visual (IMV), sendo 15 atletas de voleibol e 15 não-atletas. O Revised Movement Imagery Questionnaire não indicou diferenças entre grupos ou modalidades de IM; todavia os atletas imaginaram-se melhor que os não-atletas. Para ambos os grupos, a potência em BPA resultou menor em IM do que em ESP, sendo mais reduzida em IMC. Ativação cortical similar ocorreu em ambos os hemisférios de não-atletas e mais pronunciada no hemisfério esquerdo de atletas, principalmente durante IMC. Tais resultados sugerem que IM reduz a atividade de alfa de acordo com o conhecimento real da tarefa e a modalidade de IM.PALAVRAS-CHAVE: imagética motora, banda alfa, EEG multicanal. Changes in the electroencephalogram alpha band during visual and kinesthetic motor imageryABSTRACT -This study aims at statistically assessing the differences in alpha band power, particularly in the vicinity of the alpha peak (BPA), during motor imagery (MI). Multi-channel EEG (occipital and parietal regions) was acquired at rest condition (ESP) and MI kinesthetic (MIC) and visual (MIV) modalities from righthanded male subjects (18-40 years), 15 'athletes' (experienced volleyball players) and 15 'non-athletes'. The Revised Movement Imagery Questionnaire indicated no differences between groups or MI modalities, but athletes imagine themselves more clearly than non-athletes during MI. The power within BPA reduces in both groups, but greater in MIC than in MIV. The cortical activation was similar in both hemispheres of nonathletes but more pronounced in left hemisphere of athletes, mainly in MIC. The findings suggest that MI reduces alpha activity according to individual knowledge of real execution of motor task and MI modalities.KEY WORDS: motor imagery, alpha band, multi-channel EEG.A imagética motora (IM) é definida como um processo mental dinâmico no qual um sujeito simula uma tarefa motora sem que ocorra o movimento de quaisquer segmentos corporais associados a esta tarefa 1,2 . Em sessões de treinamento mental, a IM tem sido apontada como responsável pelo aumento de habilidades motoras em atividades esportivas como o voleibol 3 e críquete 4 , embora a prática real demonstre melhores resultados do que o treinamento mental 5 . A IM tem origem basicamente visual e cinesté-sica 6 , sendo a modalidade visual correspondente à simulação mental de uma determinada tarefa motora como se estivesse observando um "vídeo mental", enquanto que, na IM cinestésica, o sujeito deve "sentir" como se o seu corpo estivesse em movimento, procurando obter sensações relacionadas às contrações musculares e da posição dos diversos segmentos corporais no espaço. Dentre os protocolos utilizados no estudo da IM, destacam-se os questioná-rios, na maioria das vezes relacionados ao grau de nitidez ou per...

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Avaliação de Diferentes Wavelets para a Estimativa do Potencial Evocado Somato-sensitivo do nervo tibial

Filho

Braga

Silva

et al. 2007

IV Latin American Congress on Biomedical Engineering 2007, Bioengineering Solutions for Latin America Health

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Low-frequency oscillations in human tibial somatosensory evoked potentials

Cited by 12 publications

References 27 publications

Use of magnitude-squared coherence to identify the maximum driving response band of the somatosensory evoked potential

Use of magnitude-squared coherence to identify the maximum driving response band of the somatosensory evoked potential

Alterações na banda alfa do eletrencefalograma durante imagética motora visual e cinestésica

Avaliação de Diferentes Wavelets para a Estimativa do Potencial Evocado Somato-sensitivo do nervo tibial

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