نتایج جستجو برای: eeg waves
تعداد نتایج: 144813 فیلتر نتایج به سال:
Hans Berger (1873 – 1941) the German psychiatrist invented electroencephalography (EEG) for the recording of "brain waves" in 1924. He did this by measuring electrical activity in the brains of hospital patients with skull damage. He documented these alpha waves along with beta activity. He found that when alpha waves decrease and beta activity becomes dominant, we are fully awake. As he was th...
Introduction: Computer games have attracted remarkable attentions in general publics with different cultures and their effects are subject of research by cognitive neuroscientists. In the present study, possible effects of the game Fifa 2015 on cognitive performance, hormonal levels, and electroencephalographic (EEG) signals were evaluated in young male volunteers. Methods: Thirty two subj...
Slow wave sleep (SWS) is associated with spontaneous brain oscillations that are thought to participate in sleep homeostasis and to support the processing of information related to the experiences of the previous awake period. At the cellular level, during SWS, a slow oscillation (<1 Hz) synchronizes firing patterns in large neuronal populations and is reflected on electroencephalography (EEG) ...
normal 0 false false false en-us x-none fa background: electroencephalography (eeg) has vital and significant applications in different medical fields and is used for the primary evaluation of neurological disorders. hence, having easy access to suitable and useful signal is very important. artifacts are undesirable confusions which are generally originated from inevitable human activities such...
EEG is a collaborative tool to diagnosis brain function and disease. Modern interpretation of EEG origin rest with knowledge of basic neuronal electrochemical process. The EEG is composed of electrical rhythms and transient discharges which are distinguished by location, frequency, amplitude, form, periodicity and functional properties. The low-level EEG Signal from the brain as recorded is amp...
Artifact reduction for EEG/fMRI recording part 1: nonlinear reduction of ballistocardiogram artifact
Objective: We present a new method to effectively remove ballistocardiogram artifacts (BAs) of electroencephalography (EEG), recorded inside a 1.5 T static magnetic field scanner, and conserve the time and frequency features of EEG activity. Methods: The BAs are approximated as deterministically chaotic dynamics. A wavelet-based nonlinear noise reduction (WNNR) method consisting of wavelet tran...
Background and purpose: Inhaling substances are hydrocarbons that are converted to gas at room temperature and enter the lungs through the nose and mouth and then our brain. Neurological and psychiatric effects are reported following inhalation, however, there are few studies about acute effect of inhalant on brain electroencephalogram (EEG). Materials and methods: This observational study wa...
Acute hyperammonemic encephalopathy is generally associated with severe liver disease, manifesting neuropsychiatric symptoms including confusion, lethargy, seizure, coma, and even death. Electroencephalogram (EEG) a proven diagnostic, prognostic, therapeutic tool in patients acute chronic encephalopathies. EEG changes are background slowing theta to delta ranges, accompanied by presence of trip...
the purpose of the present study is the comparison of the pattern of language perception in down syndrome (ds) children and typical children. to achieve the objective, nine subjects with ds (whose mental ages were 72-78 months and were drawn from five center of special education in the city of mashhad) and five typical children with the same mental ages were selected through random sampling; an...
This paper presents the physiological activity of the cerebral cortex in sheep in electroencephalo- graphic findings. The study was performed to evaluate and improve understanding of brain monitor- ing methods in freely moving animals without the use of any anaesthetic methods during the acquisi- tion stage. The aim of the study was to determine the physiological activity of the cerebral cortex...
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