Week 5 Quiz

A child asleep at a sleepover does not hear the movie still playing, yet stirs when someone says her name. Which statement best fits how this course describes consciousness?

Select one.

• Consciousness is an on-off switch, and sleep turns the brain off
• Consciousness exists only when a person can answer questions aloud
• Consciousness is awareness on a continuum, and the sleeping brain stays active
• Consciousness stops in sleep and restarts only during dreams

Which brain structure receives light information from the eyes and keeps the body's circadian rhythm in step with the light-dark cycle?

Select one.

• The suprachiasmatic nucleus (SCN) in the hypothalamus
• The hippocampus in the temporal lobe
• The amygdala
• The occipital lobe

A student scrolls a bright phone in bed late at night. What does the light most likely do to melatonin, and why does that matter for sleep?

Select one.

• It raises melatonin, so the student falls asleep sooner
• It has no effect, because melatonin follows the wall clock
• It raises melatonin only during REM sleep
• It holds melatonin back, which can push sleepiness later

According to the National Institute of Neurological Disorders and Stroke, about 90 minutes after a person falls asleep the eyes begin to dart, brain activity looks much like waking, and the voluntary muscles go limp. Which stage has begun?

Select one.

• The lightest stage, right after falling asleep
• REM sleep, its first period of the night
• Slow-wave sleep, the deepest stage
• The stage marked by sleep spindles

In a sleep lab, a volunteer shows large, slow brain waves and is very hard to wake. Which stage is this?

Select one.

• The lightest stage, right after falling asleep
• REM sleep, because it is the deepest stage
• Slow-wave sleep, the deepest stage
• The stage marked by sleep spindles

True or false: dreams happen only during REM sleep.

True or false.

• True
• False

Ten students reported their hours of sleep and next-day quiz scores (illustrative data); r = 0.8457. Which conclusion does this correlational study support?

Select one.

• In this sample, more sleep was associated with higher scores
• More sleep caused the students' scores to rise
• About 84.57 percent of each quiz score came from sleep
• Sleep and quiz score were unrelated in this sample

In the ten-student illustrative dataset, the 7 students who slept 7 to 9 hours scored 15, 13, 16, 17, 14, 18, and 17 out of 20. What is their mean score, to one decimal place?

Select one.

• About 12.3
• About 14.7
• About 11.0
• About 15.7

A dream researcher argues that dreams are the brain's attempt to build a story out of largely random neural activity during REM sleep. Which theory is this?

Select one.

• Freud's wish-fulfillment theory
• The activation-synthesis hypothesis
• The information-processing view
• The theory of latent content

Select every statement that is accurate about psychoactive drugs.

Select every option that applies.

• Alcohol is a depressant: it slows the nervous system, including reaction time
• Caffeine is a stimulant: it speeds up the nervous system
• Tolerance means a larger dose is needed for the same effect
• Alcohol is a stimulant, because the first drink can make a person talkative
• Withdrawal means a larger dose is needed for the same effect