Learning foreign speech contrasts involves creating new representations of sound categories in memory. This formation of new memory representations is likely to involve changes in neural networks as reflected by oscillatory brain activity. To explore this, we conducted time-frequency analyses of electro-encephalography (EEG) data recorded in a passive auditory oddball paradigm using Thai langua...

We report on mathematical methods for the exploration of spatiotemporal dynamics of Magneto- and Electro-Encephalography (MEG / EEG) surface data and/or of the corresponding brain activity at the cortical level, with high temporal resolution. In this regard, we describe how the framework and numerical computation of the optical flow--a classical tool for motion analysis in computer vision--can ...

Matching the proton-magnetic-resonance frequency to the frequency of a periodic neural oscillation (e.g., alpha or gamma band waves) by magnetic resonance imaging techniques, enables direct visualization of brain functional connectivity. Functional connectivity has been studied by analyzing the correlation between coherent neural oscillations in different areas of the brain. In electro- or magn...

Sequences of functional brain images obtained from image reconstruction techniques applied to Magnetoand Electro-encephalography (M/EEG) data convey a large amount of information in space and time; typically 1,000 images per second. Conventional analysis approaches to this data mining issue require considerable input from human experts. Hence, there is an emerging need for fast and automatic ex...

BACKGROUND Limbic encephalitis, an immune-mediated encephalitis, results from inflammation in the medial temporal lobes. The paraneoplastic form is rare in pediatric population, and frequently precedes tumor diagnosis. CASE CHARACTERISTICS A 9-year-old boy receiving chemotherapy for Hodgkin lymphoma, developed headache, temporal lobe seizures, anxiety, hallucinations, short-term memory loss a...

The EEG signals are the prime sources to diagnose and manipulate Epilepsy, state of coma and numerous studies. The EEG signals in the active brains constitute various body activities controlled or out of human consciousness. There exist considerable researches that focus to minimize the artifact values in the EEG domain. This paper is the evaluation of detection methods to study their efficienc...

The basic inverse problems for the functional imaging techniques of Electroencephalography (EEG) and Magnetoencephalography (MEG) consist of estimating the neuronal current in the brain from the measurement of the electric potential on the scalp and of the magnetic field outside the head. Here we present a rigorous derivation of the relevant formulae for a three-shell spherical model in the cas...

INTRODUCTION Stuttering is defined as speech characterized by verbal dysfluencies, but should not be seen as an isolated speech disorder, but as a generalized sensorimotor timing deficit due to impaired communication between speech related brain areas. Therefore we focused on resting state brain activity and functional connectivity. METHOD We included 11 patients with developmental stuttering...

In recent years, there has been a significant increase in the use of electroencephalography (EEG) and magnetoencephalography (MEG) to investigate changes in oscillatory brain activity associated with tinnitus with many conflicting results. Current view of the underlying mechanism of tinnitus is that it results from changes in brain activity in various structures of the brain as a consequence of...