EEG

An EEG works on the principle that information is processed in the brain as electrical…

Activity in the form of action potentials transmitted along neurons

EEG scanners measure this electrical activity by using ________________ attached to the scalp by a skull cap, usually lasting from _____ minutes to be _________

Electrodes and wires

20-40

Line graphed

These indicate the ____________ of activity in each part of the brain and images are obtained _____________ in real time so there is no delay

The scan recording represents the _____________ that are generated from the action of millions of neurons

Level and type

Every millisecond

Brainwave patterns

There are different types of EEG patterns which reflect different brain activity. These include…

Alpha, beta, theta and delta waves

Alpha waves are usually associated with _________ while theta and delta waves are associated with ___________

Light sleep

Deep sleep

EEG scanning was responsible for developing our understanding of ______________ (REM or dreams) sleep, which is associated with _______________ brain activity that indicates the person being studied is dreaming

Rapid eye movement

Fast and disorganised

EEG can also be used to detect illnesses like _________________, and to diagnose other conditions that affect brain activity such as ____________

Epilepsy and sleep disorders

Alzheimer's disease