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  Electro Encephalography

Introduction to Electro Encephalography

EEG (ELECTRO ENCEPHALO GRAPHY) is a superposition of the volume-conductor fields generated through a range of active neuronal current generators. The three kinds of electrodes to create the measurements are scalp, cortical, and depth.

Bioelectric Potential from the Brain

Wave group of the normal cortex

ALPHAWAVE

- 8 to 13 Hz, 20-200 μV,

- Recorded mostly at the occipital region

- disappear while subject is sleep, change while subject change focus,

BETA WAVE (I AND II)

- 14 to 30Hz,

- During mental activity f=50Hz, beta I disappear during brain activity when beta II intensified.

- Recorded mostly at the parietal and frontal regions

THETA WAVE

4 to 7 Hz comes out during emotional stress like disappointment and frustration

Recorded at the temporal and parietal regions

DELTA WAVE

Below 3.5 Hz, take place in deep sleep, take place independent of activity

Take place solely in the cortex, independent of activities in lower regions of the brain. Sync is the emphasize process which brings a group of neurons into unified action. Synaptic interconnection and additional cellular field interaction results Synchronization.

EEG WAVES

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EEG WAVES DURING SLEEP

 

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