Study of the basic mechanism of brain rhythms adds to our understanding of the underlying processes of neuronal network within the human brain. Electroencephalography (EEG) records summated extracellular field potentials from large pyramidal neurons in the cerebral cortex. The characteristic rhythmic oscillation of brain rhythms are beststudied by sleep spindles, which are generated within the ...

The appearance of unknown words often disturbs communication. Most work on unknown words in spoken dialog systems deals with words that are uttered by the user, but which are not covered by the system’s vocabulary. In this paper, we focus on detecting unknown words from the user side, in the case where the system utterance is unknown to the user. In particular, we develop a classifier based on ...

Electroencephalograms (EEGs) are brain waves, which are recorded using scalp electrodes. Generally, signal attenuate on recording and amplitude of the evoked potentials (EPs) are low when merged with the base brain waves. Therefore, mathematical tools are needed to analysis the time series (EEGs) to discover the EPs in the base EEGs. This paper reviews spectral analysis based on periodic amplit...

There is ongoing discussion whether cellular or mobile phone has any effects on brain. The aim of this research is to investigate the effects of mobile phone use on left and right ear using electroencephalograph (EEG). The brain waves are analyzed using Wavelet transform and Fast Fourier Transform. Twenty subjects are studied after recording their EEG signals using International 10/20 system of...

The study aimed to develop a computational method for assessing relative changes in compartmental compliances within the brain: the arterial bed and the cerebrospinal space. The method utilizes the relationship between pulsatile components in the arterial blood volume, arterial blood pressure (ABP) and intracranial pressure (ICP). It was verified by using clinical recordings of intracranial pre...

In nature, excitable reaction-diffusion systems found in diverse settings (e.g. chemical reactions, metal rust, yeast, amoeba, heart, brain) generate geometrically similar macroscopic waves(1,2). For the heart and brain, the spatiotemporal patterns formed by these excitation waves separate healthy from diseased states(1-3). Current electrical and pharmacological therapies for bioelectric disord...

There is ongoing discussion whether cellular or mobile phone has any effects on brain. The aim of this research is to investigate the effects of mobile phone use on left and right ear using electroencephalograph (EEG). The brain waves are analyzed using Wavelet transform and Fast Fourier Transform. Twenty subjects are studied after recording their EEG signals using International 10/20 system of...

Spontaneous retinal waves are critical for the development of receptive fields in visual thalamus (LGN) and cortex (VC). Despite a detailed understanding of the circuit specializations in retina that generate waves, whether central circuit specializations also exist to control their propagation through visual pathways of the brain is unknown. Here we identify a developmentally transient, cortic...

BACKGROUND Neurological and/or neuropsychological damages are important complications of cardiosurgical interventions. This study determined if the timing of the electroretinographic (ERG) ocular exam can assess intraoperative brain damage of patients supported by extracorporeal circulation (ECC) during cardiosurgical interventions. MATERIALS AND METHODS The authors illustrate an ERG techniqu...

The spatiotemporal behavior of human EEG oscillations is investigated. Traveling waves in the alpha and theta ranges are found to be common in both prestimulus and poststimulus EEG activity. The dynamical properties of these waves, including their speeds, directions, and durations, are systematically characterized for the first time, and the results show that there are significant changes of pr...