EEG Presentation John Sept 10

EEG Presentation John Sept 10 - Generalized Overview of EEG...

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Unformatted text preview: Generalized Overview of EEG The Equipment Heuristics of defining the ongoing activity of the human brain The Waveforms Artifact Alpha Delta Beta Amplifier EEG CAP Stimulus Time synched stimulus markers Ongoing EEG Ongoing EEG Electrical Potential: A metaphor Electric potential may be conceived of as "electric pressure". When "pressure" is uniform, no current flows and nothing happens. This is similar to why people do not feel normal atmospheric air pressure: there is no difference between the pressure inside the body and outside, so nothing is felt. However, where this electrical pressure varies, an electric field exists, which will create a force on charged particles. Point 1: Potential is about 0 Point 2: Varies across time with respect to 1, current only Flows when the potentials are different + + EEG is measured from a series of electrodes on the surface of the head. The number of electrodes range from as few as three to as many as 256. Montage: an artistic composite of juxtaposed more or less heterogeneous elements Reference: a hypothetical zero point against which other electrical signals are measured Wave Terminology: Each wave has a peak and trough made by deflections from a zero point. Peak: The top of a waveform, the maximum height of a wave from the middle of its greatest width Trough: The opposite of a peak Baseline: The moment at which a waveform crosses zero mV How do you find ZERO? Deflection: any change from baseline. Back in the day EEG Was measured with a pen tracing on paper. The pen would deflect From zero in either the positive or negative direction. Individual Channel Recording: Each electrode produces a recording of deflections over time Time The identification of waveforms Time EEG: At what frequency does the waveform occur Space The topography of the waveform Cortical Localization : the region of the brain that produces the waveform Contex t : the experimental mental events correlated with the waveform Amplitude/Deflection ERP: directionality of the waveform EEG: size of the waveform Morphology EEG: shape of the waveform Frequency:...
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EEG Presentation John Sept 10 - Generalized Overview of EEG...

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