Upgrade to remove ads
psych chapter 3
Terms in this set (15)
Sleep can be described as a regularly occurring ASC that typically occurs naturally and is primarily characterised by a loss of conscious awareness.
Methods used to study sleep
-Electroencephalograph(EEG)- Is used to detect, amplify and record the electrical activity spontaneously generated by the brain during sleep and dreaming.
-Electromyography- Is used to detect, amplify and record the electrical activity of muscles.
-Electro-ocular graph- Measures eye movements or eye positions by detecting, amplifying and recording electrical activity in eye muscles that control eye movements
-Heart rate and core body temperature
-Self reports- A sleep diary is a self reported record of an individuals sleep and waking time activities, usually over a period of several weeks.
Characteristics and pattern of sleep
-Non rapid eye movement sleep (NREM sleep)
-Rapid eye movement sleep (REM sleep)
-Aprox 80% of our sleep time is spent in NREM sleep.
-During NREM sleep the brain is active as during REM sleep or during normal waking consciousness.
-NREM sleep consists of for different stages which the sleeper progresses from stage of light sleep to the stage and back again through one or more stages of light sleep.
-Sleep is examined by EEG data
used to describe the number of brain waves
is used to describe the intensity of the brain waves and is estimated by the size of the brain waves.
-Occurs as we drift into and out of a true sleep state.
-Gradually loose awareness of ourselves and our surroundings
-As a result of muscles relaxing we sometimes experience a 'jerking' sensation whereby the body, or part of our body, seems to go into a spasm
-This stage 1 spasm is known as hypnic jerk
-EEG pattern shows a decrease in alpha wave production as these brain waves are replaced by more irregular medium frequency theta waves- mixture of high and low amplitude
-Stage 1 last about 5 to 10 minutes
-If woken in stage one, may feel as though you haven't been asleep.
NREM STAGE 2
-Light stage of sleep but can be said to be truly asleep
-Less easily disturbed then in stage 1
-Lasts about 10-20 minutes
-Body movements lessen, breathing becomes more regular, blood pressure and temperature continue to fall and heart rate is slower
-Mainly theta waves
-There are brief bursts of high frequency brain wave activity called sleep spindles
-They indicate that a person is truly asleep
-Brain still responds to external and internal stimuli
-EEG also shows low frequency and slightly higher amplitude waves called K complexes
-Midway through stage 2 unlikely to respond to anything but loud stimuli
-Compared to stage 3 and 4, stage 2 is still considered to be light sleep
-If awaken, person will believe that they weren't really asleep just dozing or thinking
NREM STAGE 3
-Start or the deepest period of sleep
-Lasts about 10 minutes
-Best called-Moderately deep sleep
-Heart rate, blood pressure and body temperature continue to drop
-Breathing rate continues to be slow and steady
-Extremely relaxed and less and less responsive
-Difficult to arouse
-Reduction in brains activity- delta waves begin to appear in EEG recording
-Delta waves make up of 50% of brain waves recorded in stage 3
-Slow, large and regular brain waves marks beginning of slow wave sleep (SWS)
-SWS begins within an hour of falling asleep.
NREM STAGE 4
-Deepest stage of sleep
-Best be called very deep sleep
-Psychological signs are similar as to those in stage 3
-Muscles are completely relaxed
-Delta waves dominate and are even slower and larger then in stage 3
-Very difficult to wake a person up in this stage
-In first sleep cycle someone may spend up to 20 minutes in stage 4
-In cycles close to morning may be no stage 3 and 4 at all
-During stages 3 and 4 that sleep phenomena occurs such as sleep walking, talking and night terrors.
-A period of rapid eye-movement sleep during which the eyeballs rapidly move beneath the closed eyelids darting back and forth and up and down in jerking movements
-Brain wave pattern associated with REM is irregular consisting of low amplitude, high frequency Beta waves
-Body's internal functioning is more active during REM sleep
-Heart is faster, blood pressure rises and breathing is quicker
-But sleeper is totally relaxed
-REM Sleep is called paradoxical sleep- the brain and body are active while externally the body appears calm and inactive
-Most dreaming occurs during REM
Changes in sleep patterns over lifespan
-Sleeping gradually decreases as we get older
-NEWBORN- sleeps around 16 hours a day and 50% REM sleep
-END OF INFANCY- sleep time drops to 12-13 hours and about 25-30% REM sleep
-END OF CHILDHOOD- drops to 9 hours and 20% REM sleep
-LATE DULTHOOD- total sleep is about 6-7 hours and one third REM sleep
-90+ -stage 3 and 4 are barely experienced
-Means going without sleep, that sleep loss.
-Falls into broad categories:
Partial sleep deprivation- involves having less that what is normally required
Total sleep deprivation- involves not having any sleep at all
a very short period of drowsiness or sleeping that occurs while the person is apparently awake.
YOU MIGHT ALSO LIKE...
Chapter 3 - Sleep
Sleep: VCE Psychology Unit 3 & 4
OTHER SETS BY THIS CREATOR
geo unit 3
OTHER QUIZLET SETS
SPHP 127: Exam 3
COPD. interstitial, atelectatic, and pleural disor…
development test 3