Luiz Fernando Basile

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The aim of the present investigation was to localize the sources of the N400 response elicited in a sentence-reading paradigm. Eight neurologically healthy adults viewed sentences that were presented one word at a time in the center of a computer screen. Half of the sentences ended with a semantically inappropriate word, while the other half had appropriate(More)
The event-related cortical potential elicited in the context of auditory target detection tasks includes the N1, P2 and P3 components. The aim of the present study was to identify the sources of these scalp-recorded components using an electrical multiple dipole model. Nine healthy adults volunteered for the study. An auditory oddball paradigm was used.(More)
Slow magnetic fields concurrent with two successive contingent negative variations (CNVs) were elicited in 8 subjects during visual recognition tasks involving pattern versus place discrimination. All stimuli were presented as a rectangular array of lights with various patterns of 6 lights at the center and, simultaneously, with places indicated by missing(More)
This study used magnetoencephalography to examine the possibility that different generators account for the long-latency event-related potential (P300), evoked by rare target and by rare non-target, novel visual stimuli, in a visual oddball counting task performed by seven subjects. As expected, P300 peak latency was longer in response to rare targets(More)
The present study represents our second successful use of magnetoencephalography to identify different sources of human prefrontal activity corresponding to subjects' engagement in different tasks. We used two visual recognition tasks: a familiar person recognition and an abstract pattern recognition task in the context of a design suitable for eliciting(More)
Several studies have investigated the relationship between asymmetrical EEG activity over the frontal cortex and mood. This study aimed at investigating the association between state fluctuations in frontal alpha EEG asymmetry and state changes followed by 24 h of sleep deprivation (SD). Our results show that sleep deprivation caused a significant(More)
The present investigation was undertaken in order to utilize magnetoencephalography to locate generator sources, modeled as equivalent current point dipoles, that account for the well-established late positive electrical potentials commonly measured along the midline (Cz, Pz, Fz, and Oz) in response to rare or task-relevant stimuli and their simultaneously(More)
Evoked magnetic fields to randomized infrequent omissions of visual stimuli resulted in a magnetic field pattern over the right hemisphere consistent with a dipolar source and led to localization of this source within the superior temporal sulcus. Previous investigations using implanted microelectrodes, ablation/lesion procedures in monkeys and observations(More)
We studied evoked magnetic fields and electrical potentials following stimulation of the tibial nerve in a group of 24 normal subjects. Both magnetic and electrical recordings demonstrated a series of oscillatory patterns consisting of four peaks (two positive and two negative) occurring between 40 and 100 msec. Magnetic field source localization of all(More)
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