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	Provedor de dados BJMBR (4) Autor Infantosi,A.F.C. (4) Melges,D.B. (2) Azevedo,L.C. de (1) Cagy,M. (1) França,A.I. (1) Lazarev,V.V. (1) Lemle,M. (1) Miranda de Sá,A.M.F.L. (1) Tierra-Criollo,C.J. (1) Valencio-de-Campos,D. (1) Mais... Palavra-chave Magnitude-squared coherence (2) Somatosensory response detection (2) Tibial nerve (2) Adolescents (1) Averaging (1) Brain topography (1) Children (1) Electroencephalogram (1) Event-related brain potentials (1) Gamma oscillations (1) Intermittent photic stimulation (1) N400 identification (1) Photic driving (1) Topography (1) Verb-complement merges (1) Mais... Tipo do documento Info:eu-repo/semantics/article (4) Ano 2008 (1) 2006 (2) 2004 (1) País Brazil (4) Idioma Inglês (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Statistical analysis of event-related potential elicited by verb-complement merge in Brazilian Portuguese BJMBR Cagy,M.; Infantosi,A.F.C.; França,A.I.; Lemle,M.. An interesting fact about language cognition is that stimulation involving incongruence in the merge operation between verb and complement has often been related to a negative event-related potential (ERP) of augmented amplitude and latency of ca. 400 ms - the N400. Using an automatic ERP latency and amplitude estimator to facilitate the recognition of waves with a low signal-to-noise ratio, the objective of the present study was to study the N400 statistically in 24 volunteers. Stimulation consisted of 80 experimental sentences (40 congruous and 40 incongruous), generated in Brazilian Portuguese, involving two distinct local verb-argument combinations (nominal object and pronominal object series). For each volunteer, the EEG was simultaneously acquired at... Tipo: Info:eu-repo/semantics/article Palavras-chave: Event-related brain potentials; Verb-complement merges; Averaging; N400 identification. Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006001100010 Use of magnitude-squared coherence to identify the maximum driving response band of the somatosensory evoked potential BJMBR Infantosi,A.F.C.; Melges,D.B.; Tierra-Criollo,C.J.. 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 a = 0.05), the beta and gamma bands, 15-66 Hz,... Tipo: Info:eu-repo/semantics/article Palavras-chave: Gamma oscillations; Somatosensory response detection; Tibial nerve; Magnitude-squared coherence. Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006001200011 Topographic aspects of photic driving in the electroencephalogram of children and adolescents BJMBR Lazarev,V.V.; Infantosi,A.F.C.; Valencio-de-Campos,D.; Azevedo,L.C. de. The electroencephalogram amplitude spectra at 11 fixed frequencies of intermittent photic stimulation of 3 to 24 Hz were combined into driving "profiles" for 14 scalp points in 8 male and 7 female normal subjects aged 9 to 17 years. The driving response varied over frequency and was detected in 70 to 100% of cases in the occipital areas (maximum) and in 27 to 77% of cases in the frontal areas (minimum) using as a criterion peak amplitude 20% higher than those of the neighbors. Each subject responded, on average, to 9.7 ± 1.15 intermittent photic stimulation frequencies in the right occipital area and to 6.8 ± 1.97 frequencies in the right frontal area. Most of the driving responses (in relation to the previous background) were significant according to the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Electroencephalogram; Intermittent photic stimulation; Photic driving; Brain topography; Children; Adolescents. Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000600014 Topographic distribution of the tibial somatosensory evoked potential using coherence BJMBR Melges,D.B.; Infantosi,A.F.C.; Miranda de Sá,A.M.F.L.. The objective of the present study was to determine the adequate cortical regions based on the signal-to-noise ratio (SNR) for somatosensory evoked potential (SEP) recording. This investigation was carried out using magnitude-squared coherence (MSC), a frequency domain objective response detection technique. Electroencephalographic signals were collected (International 10-20 System) from 38 volunteers, without history of neurological pathology, during somatosensory stimulation. Stimuli were applied to the right posterior tibial nerve at the rate of 5 Hz and intensity slightly above the motor threshold. Response detection was based on rejecting the null hypothesis of response absence (significance level α= 0.05 and M = 500 epochs). The best detection rates... Tipo: Info:eu-repo/semantics/article Palavras-chave: Somatosensory response detection; Magnitude-squared coherence; Tibial nerve; Topography. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008001200004 Registros recuperados: 4 Primeira ... 1 ... Última

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