hand written notes of the b.tech ece and eee

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MDU RANK LIST IS OUT

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brain monitoring Electroencephalography (EEG)

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Electroencephalography  ( EEG ) is an  electrophysiological  monitoring method to record electrical activity of the  brain . It is typically noninvasive, with the  electrodes  placed along the  scalp , although invasive electrodes are sometimes used such as in  electrocorticography . EEG measures voltage fluctuations resulting from  ionic current  within the  neurons  of the  brain . [1]  In clinical contexts, EEG refers to the recording of the brain's spontaneous electrical activity over a period of time, [1]  as recorded from multiple  electrodes  placed on the scalp. Diagnostic applications generally focus either on  event-related potentials  or on the  spectral content of EEG. The former investigates potential fluctuations time locked to an event like stimulus onset or button press. The latter analyses the type of  neural oscillations  (popularly called "brain waves") that can be observed in EEG signals in the frequency domain. EEG is most often used to diagnose 
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Types and models [ edit ] Main article:  Oscilloscope types The following section is a brief summary of various types and models available. For a detailed discussion, refer to the other article. Cathode-ray oscilloscope (CRO) [ edit ] For more details on this topic, see  Oscilloscope types § Cathode-ray oscilloscope . Example of an analog oscilloscope Lissajous figure, showing a harmonic relationship of 1 horizontal oscillation cycle to 3 vertical oscillation cycles. For  analog television , an analog oscilloscope can be used as a  vectorscope  to analyze complex signal properties, such as this display of  SMPTE color bars . The earliest and simplest type of oscilloscope consisted of a  cathode ray tube , a vertical  amplifier , a timebase, a horizontal amplifier and a  power supply . These are now called "analog" scopes to distinguish them from the "digital" scopes that became common in the 1990s and 2000s. Analog scopes do not necessa
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