sleep - measuring sleep

what is an EEG (electroencephalograph)

an EEG is a device that detects, amplifies and records electrical activity of the brain

how does an EEG work

it involves small electrodes being attached to the scalp. each electrode receives signals from thousands of neurons in the brain.

what does the EEG do

the EEG turns the information from the electrodes into the visual pattern of brain waves

what is an EOG (electroculargraph)

an EOG is a device that detects, amplifies, and records electrical activity of the muscles responsible for eye movement

how does an EOG work

it involves small electrodes being attached to the upper face around the eyes. each electrode receives signals from the contractions of the muscles that are responsible for eye movement

what does the EOG do

the EOG then turns this information from the electrodes into the visual pattern

what does the EOG detect

the EOG detects less eye movement when in NREM sleep but a lot of eye movement when in REM sleep

what is an EMG (electromyograph)

an EMG is a device that detects, amplifies, and records electrical activity of the muscles

how does an EMG work

it involves small electrodes being attached to the lower face around the jaw. each electrode receives signals from the contractions of the muslces

what does the EMG do

the EMG then turns this information from the electrods into the visual pattern

what does the EMG detect

the electromyography will show less muscle contractions when we are asleep and a compeltely relaxed state (no muscle movement) during REM sleep