Chapter 5-my notes Flashcards
What is the circadian rythm?
- cycle of bodily rythm that naturally occurs over a 24-hour period
- cylce of sleep and waking
- rest-activity cycle
What does circa mean?
About
What does diem mean?
Day
What is not awake?
Mind and brain=turned off BUT mind creates dreams
What is dream consciousness?
Altered state of consciousness (radical), departs from normal subjective experience of the world and the mind
What are examples of changes in the dream consciousness?
Thinking, sense of time, (o) loss of control, emotional expression, body image and sense of self, meaning of significance, perception
What are the two perspectives on consciousness?
1- Mind without consciousness 2- Consciousness in altered state (mind altered consciousness)
What is sleep deprivation?
Significant loss of sleep
What are microsleeps?
Brief sidesteps into sleep that last only a few seconds, less than 30 seconds
What are serious consequences of minimal sleep loss?
- Memory problems (esp. when awakened at the start of REM activity)
- excessive aggression
- physical effects bc no healing of bacteria (deprivation of slow-wave sleep=stage 4)
Why is sleep important?
- To keep knowledge we intake (of course changes too)
ex: studying all night= not help=no material sticks - Recuperation, growth, mental health
Why is evolution tied to sleep?
Number of hours of sleep can come from the number of hours necessary for safety of animal (easy prey=less sleep)
What are brain waves used for?
Determine which stage of sleep an individual is experiencing
What is an EEG?
- An electroencephalograph: shows brain wave activity as a person passes through various stages of sleep
- Changes in electrical activity
Ex: alternation between beta waves and alpha waves
What are beta waves?
awake waves
Alpha waves?
state of relaxation or light sleep, drowsiness
Theta waves?
Early stages of sleep; light sleep
Delta waves?
Slow waves; deepest stage of sleep
What do you experience during stage one?
- Hypnagogic images – vivid visual events (dreamlike), surrealist consciousness, replacement of wandering thoughts and images and odd juxtaposition
- Hypnic jerk – knees, legs, or whole body jerks, quiver, sensation of drooping (missing step of staircase)
- Temperature, heart rate, blood pressure, respiration rate, and muscle tension start to drop
- Frequency of patterns=lower than alpha waves=that waves and a bit of alpha waves
- 10 minutes
What is the hypnopompic state?
Post-sleep consciousness, glimmerings of waking consciousness
What do you experience during stage two?
– Sleep spindles (brief bursts of activity only lasting a second or two) and K complexes
- Temperature, heart rate, blood pressure, respiration rate, muscle tension continue to drop
- More difficult to be awaken
- 20 minutes
What do you experience during stage 3 (40mins and decreases as the cycles passe) and 4 (30 to 40mins)?
- Delta waves pronounced
- Stage 4: Deep sleep= 50 percent+ of waves are delta waves also MRTBH continue to drop and are lowest.
What are interesting facts about stage 3 and 4?
- Only occur in the first portion of your night’s sleep
- More deaths of very old/ill people occur during stage 4
- Delta waves blocked by alcohol
What do you experience during stage 5= REM? (rapid eye movement)
- Stage in which eyes move rapidly under the eyelids
- Person is typically dreaming
- Temperature rises
- Blood pressure, heart rate, respiration rate are irregular
- Muscle tension is low
- High-frequency sawtooth waves, similar to beta waves (mind as active as it is during waking)
- Sexual arousal
- Few mins to an hour