Chapter 4: Concsiousness: Wide Awake, in a Daze, or Dreaming? Flashcards
Sleep, Dreaming, and Circadian Rhythm Hypnosis: Real or Imagined? Psychoactive Drugs
consciousness
feelings, thoughts and aroused states of which we are aware
microsleep
brief episode of sleep that occurs in the midst of wakeful activity
circadian rhythm
changes in bodily processes that occur repeatedly on approximately a 24- to 25- hour cycle
suprachiasmatic nucleus SCN
a group of brain cells located in the HYPOTHALAMUS
signals other brain areas when to be aroused/when to shut down (On/Off)
melatonin
hormone in the body that facilitates sleep
non-REM sleep
relaxing state of sleep in which the person's eyes do NOT move 4 Stages _ Stage 1 - light sleep & theta waves; 1-7 mins. "falling/floating" sensation
Stage II = sleep spindles(slower thetas)
lasts 20 mins
hard to wake you up here
St 3 & 4 = slow wave sleep
delta waves - large, slow
ST 4 = DEEP sleep
when you have consistent deltas
heart, breathing, temp, blood flow to brain all slowed down
growth hormone is secreted
difficult to awakend - disoriented/confused
30 -40 mins then…
cycle back to nonREM Stage II then to
REM! (dreaming!
REM sleep
active state of sleep in which the person’s eyes move
dreaming happens here
brain waves look like “awake” person!
REM behavior disorder
condition in which normal muscle paralysis does NOT occur, leading to violent movements during REM sleep (thrashing, kicking, etc.) mostly in old men
REM rebound
loss of REM sleep is recouped by spending more time in REM on subsequent nights!
manifest content
Freud
what the dreamer recalls on awakening
latent content
Freud
the symbolic meaning of a dream
threat simulation theory
suggests that dreaming is an ancient biological defense mechanism that allows us to repeatedly simulate potentially threatening situations so that we can rehearse our response to these events.
activation-synthesis theory
suggest that dreams do NOT have symbolic meaning, but hey are the by-product of the brain’s random firing of neural impulses during REM sleep
sleep disorder
a disturbance in the normal pattern of sleeping
95% of Americans experience at some point
25-40% of children
Insomnia
a sleep disorder in which a person cannot get to sleep and/or stay asleep