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You should be able to… • Know definition of Consciousness and be able to discuss the history of psychological research of Consciousness. • Describe the functions and characteristics of sleep.
Consciousness through the years… • late 1800’s…introspection: look inside yourself • 20th century…scientific study OVERT BEH. • 1950’s…to understand behavior, we must consider the role of conscious mental processes • ‘cuz now we have more objective ways to study conscious experiences! • psychological, physiological, social & cultural influences!
What regulates consciousness? • circadian rhythms: cyclical daily fluctuations • biological processes • psychological processes • 9 am/pm peak mental alertness vs. 3 am/pm mental slump (sleepy) • 11 am/ 7pm peak physical strength • Entrainment: • synchronization or alignment of the internal biological clock rhythm, (phase & period), to external time cues (natural dark-light cycle). • sunlight • detected by photoreceptors which tell SCN to suppress melatonin.
Using Physical Activity to Beat the Afternoon Slump • It increases oxygen circulation throughout the body, including your brain. • It increases your body temperature, which combats your biological clock. • It releases adrenalin, which stimulates your brain. • If you go outside you'll get a shot of sunlight, which also helps to combat mid-afternoon drowsiness.
Consciousness • The Suprachiasmatic Nucleus (SCN) • Tiny cluster of neurons in the hypothalamus in the brain • governs the timing of circadian rhythms • The Body’s Clock • Melatonin • Hormone of the pineal gland that produces sleepiness • Decreased light increases the production of melatonin • "Melatonin tells us what time it is in the body," • inconsistent schedules = melatonin goes haywire.
What if there was an absence of light? • We’d gravitate toward natural rhythm of SCN (25 hour day!) • lose normal synchronization (body temp & melatonin) • easier to stay awake 1 hour than get up hour earlier
Other types of Rhythms • An Infradianrhythm is a biological rhythm with a period longer than 24 hours. Due to the longer time frame for each cycle the frequency of occurrence in these cycles is lower than that of the circadian rhythms. Examples include: • female menstrual cycle • bird migration • hibernation • Ultradian rhythmsare the regular recurrence in cycles of less than 24 hours from one stated point to another, as certain biologic activities which occur at such intervals, regardless of conditions of illumination. Examples include: sleep stages • alpha wave • Beta wave • Delta wave • Theta wave
Consciousness • Jet Lag • Caused by Circadian Rhythms that are drastically out of sync • physical mental fatigue, depression, irritability, disrupted sleep & negative effects on thinking, concentration and memory • Easier to go west than east
Functions of Sleep: Why do we sleep? • Adaptive/Evolutionary:animals in danger • Consolidate memories: • Creative processing: • Growth: • Restorative theory:physiological processes restore rejuvenate body & mind • NREM…restore body (physical) • REM…restore mind (mental/emotional andbrain functions) • Biological need: microsleeps & rebounds
Sleep Deprivation • Effects of Sleep Loss • fatigue • impaired concentration & performance • On even normal tasks • greater vulnerability to accidents & memory errors • Attention, learning, memory radically reduced • emotional • depressed immune system
Accident frequency More sleep, fewer accidents Less sleep, more accidents 2,800 2,700 4,200 2,600 4000 2,500 3,800 2,400 3,600 Spring time change (hour sleep loss) Fall time change (hour sleep gained) Monday before time change Monday after time change Sleep Deprivation
Consciousness Measuring Sleep Changes • Electroencephalogram (EEG) • Electrodes placed on the scalp provide a record of the electrical activity of the brain
Stages of Sleep • AWAKE… beta • Before we fall asleep… drowsy, mind wandering • Relaxed state… Alpha waves • Stage 1(2-5 minutes) • Lightest stage • theta waves • dream-like images, slow, rolling eye movements • hypnagogic hallucinations • myoclonic jerk (sleep start) • Stage 2(20 minutes) • sleep spindles • K complex: Bursts of brain activity that reflect external stimulation (sounds) or internal stimuli (muscle tightness, etc.)
Stages of Sleep cont. • Stage 3 • Theta & Delta Waves—slow • transition • Stage 4(30 minutes) • Delta Waves hit 50%—deepest level of sleep • gets shorter as night goes on • dreams? • oblivious to world! hard to wake up!
REM Sleep • REM = rapid eye movement & brain waves • paradoxical sleep • beta waves • Difficult to awaken (but if awoken…act as if awake) • Heart rate and breathing increase • Body becomes paralyzed • Occurs approximately every 90 minutes • visual cortex & frontal lobes shut down! So… • amygdala & hippocampus highly active! So… • In training in a particular task…
Rapid Eye Movement Increase as the night progresses Vivid, colorful, bizarre Dreams Paralysis (voluntary muscles suppressed) increases as mental strain increases during day Nightmares Consolidates memories Non-Rapid Eye Movement Decrease in length as the night progresses Vague, partial images and stories (sleep thinking) Sleep Walking and Talking (3 and 4) increases as physical strain increases during day night terrors REM vs. NREM
Sleep Disorders • Parasomnias: disorders during arousals from sleep • Nightmares • Night terrors • Sleepwalking (somnambulism) • Confusional arousals
Narcolepsy • Falling suddenly, irresistibly asleep • 100,000 in the US • Runs in families • Lasts about 15 minutes • Very refreshing • Can be dangerous • Extreme emotions • watch this…
Rusty the Narcoleptic Dog and VERN…
Cataplexy • Neurological condition person is paralyzed. • after a strong emotion (anger, fear, or excitement). • Can last from seconds to minutes. • Can be a symptom of Narcolepsy (60-100%) • Treated with antidepressants
Sleep Apnea • cessations of breathing during sleep & consequent momentary re-awakenings. • Because CNS is depressed & airway passage blocked/small • Common in men & overweight • In morning restless, as if didn’t get much sleep • Tend to be loud snorers • Continuous Positive Airway Pressure machine • See a clip of someone with it HERE
Insomnia • Recurring problems falling asleep or staying asleep • Sleeping pills tend to inhibit or suppress REM sleep; worsen the problem • Alcohol suppresses REM sleep; also worsens the problem • Studies show most people overestimate how long it took them to get to sleep • Barbiturates are prescribed to reduce insomnia
Restless Leg Syndrome • Neurological disorder that is characterized by unpleasant sensations of legs and an urge to move them when at the rest. • Sleep movements can be so severe that causes chronic sleep disturbances and sleep deprivation • Effects about 12 million Americans. • Causes: Mostly unknown (idiopathic) • Treatment: underlying cause, some meds, and exercise.
Periodic Limb Movement Syndrome • Muscle twitches every 20-40 seconds • Disturbs sleep
Sleep Bruxism • Teeth grinding • Enuresis • Bed wetting • Nocturnal asleep boys • Diurnal girls • Bell & bed pad
Night Terrors • high arousal & feeling terrified • during stage 4 sleep, hard to wake; mostly children • seldom remember the event • Caused by illness, anxiety, loss of loved one, negative reactions to medication
Somnambulism (Sleep Walking) • Starts in the deep stages of N-REM sleep (3 & 4) • Person can walk or talk but remembers nothing of the experience • CNNReport on Sleep Deprivation & Sleep Walking (2 min) • May be dangerous to wake up, mostly just confused or disorientated upon wakening • Can occur when random brain waves hit areas of the brain that control walking & talking • Tends to run in families (genetic)
Excessive Sleep inertia… • Sleep Drunkeness • Confusional arousal • Awakened from deep sleep (stage 4) 1st part of night • Exaggerated slowness upon awakening • Slow transition to clear consciousness after awakening • React slowly to commands • May have trouble understanding questions • Associated with irritable & aggressive behavior
REM Behavior Disorders • A neurological disorder in which a person does not become paralyzed during REM sleep, and acts out dreams his/her dreams.
Sleep Wake Schedule Disorder • Mismatch between the sleep-wake schedule demanded by a person’s bodily rhythm or environment • Teenagers • College students
Hypersomnia • Excessive sleepiness with one month as evidence by either sleep episodes or day time sleep episodes that occur almost daily. • Excessive sleepiness caused clinically significant distress/impairment in social, occupational, or other important areas • Excessive sleepiness not better accounted for by insomnia, other sleep disorder, or inadequate sleep. • Not a result of other mental disorder, physical condition, substance use, or medical condition. • Recurrent: 3 days concurrent several times a year for at least two years.
Stress… Bruxism Enuresis Bed wetting • Teeth grinding
Why don’t we remember our dreams? • Serotonin & norepinephrine (memory formation neurons) reduced during REM sleep
Dreams vary by Culture, Gender and Age *women everywhere commonly dream of children *men more commonly dream of aggression, weapons, tools *children more likely dream of animals and they are more likely to be large, threatening, and wild *college students dream of small animals, pets and tame creatures *reports from Ghana, dreams feature attacks by cows (Barnouw, 1963) *Americans find themselves embarrassed by public nakedness *Mexican American college students dream of images of death more often than AngloAmerican college students. Dreams tend to reflect life events that are important to the dreamer…..(Rosalind Cartwright research)
Dreams • Dreams—Imagery in the absence of external stimulation; sequence of images or thoughts • Can be vague or very detailed • Most vivid during REM Tend to take place in “real time” • Black and white and/or color • Most are simple extensions of the activities and problems of the day • Characters are usually people we know • Approximately 5-40 minutes
Nightmares (REM) & Night Terrors (NON-REM stage 4) • Myths—incubus, succubus—Middle Ages/Demons • Can be spawned by traumatic events • Those who suffer from nightmares are more likely to suffer from anxiety, depression, etc. • On average—2 a year • Has been linked to creativity in children • Prevalence 10-50% kids 3-5 years old; 3% young adults; 50% adults suffer occasional nightmares. • Likely to reoccur in children that are exposed to severe psychosocial stressors
What do we dream about? • Sex- 1 in 30 for women;1 in 10 for men • Women dream about men & women; 65% of men's dreams are about men • Most dreams are about events in our daily lives • Previous day’s experiences (Day residue) • Forget things that happen 5 minute after we wake up • Do not remember taped info
Have you ever dreamed of…..? • Falling 83% • Being attacked 77% • School, teacher, studying 71% • Sexual experiences 66% • Arriving late 64% • Eating 62% • A loved person dying 57% • Being locked up 56%
Have you ever dreamed of…..? • Finding money 56% • Swimming 52% • Snakes 49% • Being inappropriately dressed 46% • Unable to breathe 44% • Being nude 43% • Fire 41% • Failing an Exam 39% • Killing Someone 26%
Dream Theories: Psychoanalytic • Sigmund Freud- The Interpretation of Dreams (1900) • Unconscious wishes & urges~ fulfillment • Sexual, aggressive tendencies • discharge otherwise unacceptable feelings • Manifest Content: represents remembered story line • Latent Content: represents underlying meaning of dreams dealing with wishes and drives.
Dream Theories: Problem Solving *Cartwright As Information Processing • helps consolidate the day’s memories • Day residue • Work through real-life issues • Non-threatening, non-judgmental manner • Stimulates neural development
Dream Theories: Activation Synthesis • Activation Synthesis • dreams are result of brain’s attempt to make sense of internal random neural activity (limbic system active) • Random neural activity = memories & sensations • Reflects biological activity • Achetylcholine & Pons activate the RAS (reticular activating system) which arouses us, but not to the point of waking • RAS—alertness: stimulates neural activity in cortex that is linked to vision, hearing, & memory. • The Cortex puts these stimuli together to form dreams
What’s The Meaning of Dreams? Depends Who You Ask? • Physiological Function of Dreams:periodic brain activity associated with R.E.M. sleep gives the brain needed activity to make neural connections. Also helps facilitate memory. • Dreams As Part of Cognitive Development:all mammals experience R.E.M. sleep and many researchers believe it helps facilitate cognitive development. • R.E.M. Rebound:tendency for R.E.M. sleep to increase following deprivation. Replenishing chemicals during the day. May illustrate a biological need for it.