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
EEG WAVES DURING SLEEP
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