Lesson 7.1 Sleep and Brain Activity Quiz

A device that records the electrical activity of the brain is an

• electron microscope.

• electrocardiograph.

• electroencephalograph.

• electrodermal screening device.

How long does Stage I sleep last?

• up to 10 minutes

• 15 to 45 minutes

• 50 percent of the time spent asleep

• 75 percent of the time spent asleep

Sleep is considered a state of

• dream consciousness

• altered consciousness

• preconsciousness

• unconsciousness

Which stage is the heaviest level of sleep?

• Stage I

• Stage III

• Stage IV

• REM

How do theta waves differ from alpha waves?

• They occur as we begin to fall asleep.

• They are associated with the absence of concentrated thought.

• They are large and regular and indicate a state of deep sleep.

• They are lower in amplitude and frequency than alpha waves.

In what stage of sleep is he most likely in if a boy is sleeping so soundly his mother has trouble shaking him awake?

• Stage I

• Stage III

• Stage IV

• Stage V

At this stage of sleep, large-amplitude delta waves begin to sweep the brain every second or so.

• Stage I

• Stage III

• Stage IV

• Stage V

Circadian rhythms operate on a cycle of approximately how many hours?

• 6

• 12

• 24

• 48

A person who snores heavily and then startles awake off and on all night is most likely experiencing

• sleep apnea

• narcolepsy

• insomnia

• night terrors

Sleepwalking has been linked to

• insomnia

• hallucinations

• REM sleep

• stress and fatigue