Electroencephalograph Lab Report
1. INTRODUCTION TO ELECTROENCEPHALOGRAPH (EEG)
Hans Berger in 1929 was the first person to measure the electroencephalogram measured in humans. Electrical impulses generated by nerve firings in the brain can be measured by electrodes placed on the scalp. The EEG gives a view of neural activity and is used to non-invasively study the physiology of the human brain.EEG activity is a small signal, measured in micro volts with the main frequencies of interest up to approximately 30 Hertz (Hz) [1,2].
The frequency bands in EEG are in table 1 below[3]:
TYPE FREQUENCY(Hz) LOCATION NORMALY
Delta Upto 4 Frontally in adults, posteriorly in children, high amplitude waves. Adults slow wave sleep, in babies, has been found during some continuous attention task. …show more content…
Young children, drowsiness or arousal in older children and adults, idling, associated with inhibition of elicited responses.
Alpha 8-13 Posterior regions of head, both sides, higher in amplitude on non-dominant side, central sites at rest. Relaxed/reflecting, closing the eyes, associated with inhibitory control.
Beta >13-30 Both sides, symmetrical distribution, most evident frontally, low amplitude waves. Alert/working, active, busy or anxious thinking, active concentration.
Gamma 30-100+ Somatosensory cortex Displays during cross-modal sensory processing, also shown during short term memory matching of recognized objects, sounds or tactile sensation.
Mu 8-13 Sensorimotor cortex Shows rest state motor
Hans Berger in 1929 was the first person to measure the electroencephalogram measured in humans. Electrical impulses generated by nerve firings in the brain can be measured by electrodes placed on the scalp. The EEG gives a view of neural activity and is used to non-invasively study the physiology of the human brain.EEG activity is a small signal, measured in micro volts with the main frequencies of interest up to approximately 30 Hertz (Hz) [1,2].
The frequency bands in EEG are in table 1 below[3]:
TYPE FREQUENCY(Hz) LOCATION NORMALY
Delta Upto 4 Frontally in adults, posteriorly in children, high amplitude waves. Adults slow wave sleep, in babies, has been found during some continuous attention task. …show more content…
Young children, drowsiness or arousal in older children and adults, idling, associated with inhibition of elicited responses.
Alpha 8-13 Posterior regions of head, both sides, higher in amplitude on non-dominant side, central sites at rest. Relaxed/reflecting, closing the eyes, associated with inhibitory control.
Beta >13-30 Both sides, symmetrical distribution, most evident frontally, low amplitude waves. Alert/working, active, busy or anxious thinking, active concentration.
Gamma 30-100+ Somatosensory cortex Displays during cross-modal sensory processing, also shown during short term memory matching of recognized objects, sounds or tactile sensation.
Mu 8-13 Sensorimotor cortex Shows rest state motor