Presentation on theme: "States of Consciousness. Consciousness – the awareness of ourselves and our environment Sleep Wake Altered States."— Presentation transcript:
States of Consciousness
Consciousness – the awareness of ourselves and our environment Sleep Wake Altered States
Levels of Consciousness We know that various levels exists beyond the conscious level. Mere-exposure effect Priming Blind sight
Biological Rhythms Annual Cycles: seasonal variations (bears hibernation, seasonal affective disorder) 28 day cycles: menstrual cycle. 24 hour cycle: circadian rhythm (biological clock) – regular bodily rhythms like temperature and wakefulness. 90 minute cycle: sleep cycles.
Sleep Circadian Rhythm – pattern of biological functioning that occurs on a roughly 24-hour cycle. – Sleep – Temperature – Melatonin - sleep hormone released by the pineal gland into the bloodstream. – Suprachiasmatic nucleus – in hypothalamus causes pineal gland to produce melatonin When light strikes the retina the hypothalamus’ SCN lower production of melatonin by the Pineal Gland Decreasing light causes the SCN to increase production of melatonin, leading you to sleep
Body Temp – rises in morning, peaks during the day, dips for time in early afternoons (siesta time), drops again before we go to sleep Thinking sharpest, memory most accurate at peak of arousal Circadian rhythm is affected by staying up late, sleeping in late, travelling across time zones, shift work, electricity Artificial light and dark cave delays sleep and makes our 24 hr cycle a 25 hr cycle.
Sleep Awake Beta waves - alert state Alpha waves - the relatively slow brain waves of a relaxed, awake state Conscious Sleep – periodic natural loss of consciousness
Sleep Cycle 5 Stages of Sleep Takes about minutes to pass through the 5 stages. Brain’s waves will change according to the sleep stage NREM - The first four stages REM - The fifth stage Click to see an awake brain.
Stage 1 – Stage 1: Slow breathing, irregular heart beat hallucinations – sensory experiences that occur without a sensory stimulus Hypnagogic sensations - strange and extremely vivid sensations – Feeling like you’re falling – Hear someone calling your name Alpha & Theta waves
Stage 2 Begins 20 min. into sleep Theta Waves that get progressively slower. sleep spindles…short bursts of rapid brain waves. Gets longer throughout the night
Stages 3 Slow wave sleep. Theta & Delta waves. – Delta waves - large, slow brain waves associated with deep sleep Lasts about 30 min Difficult to awaken Vital for restoring body’s growth hormones and good overall health.
Stage 4 Delta waves. Lasts about 30 min Difficult to awaken Bed Wetting and Sleep walking, sleep talking*, night terrors – sleep disorder, high arousal appear being terrified – Seldom wakeup fully – Not nightmares (REM) Start to ascend back through stage 3, 2, 1, then….. *Sleep talking can occur at any stage of sleep
REM Sleep Rapid Eye Movement – fast jerky eye movements Paradoxical sleep – – internally aroused, externally calm. – Brain waves resemble wakefulness, but body is at rest – Body is essentially paralyzed, relaxed muscles 90 min. - Gets longer throughout the night Dreams occur during REM – emotional, story-like, richly hallucinatory, including visual, auditory, and other sensory details Genital arousal REM Rebound
Typical Nights Sleep
Stages of Sleep
Sleep Stages Alpha waves Theta waves
Why Do We Sleep? Variations in sleeping patterns – may be genetically influenced – Infants and older adults have similar sleep patters 2/3 of the day – Adults – 1/3 of the day Cultural influences – US 8 hrs, but sleeping less than a century ago (lightbulb) – Unhindered would sleep 9 hrs – People in countries without electric lights generally sleep longer. Sleep debt – can’t be paid off
The Effects of Sleep Loss US Navy and NIH studies – hrs /night felt energized and happier Age and sleep loss – Teens need 8-9 hrs if not, function below peak – Older adults and new borns have very similar sleep patterns Chronic sleep loss – Makes you fatter - Increases ghrelin (hunger arousing hormone) and decreases leptin (hunger-suppressing hormone – Suppresses immune cells that fight off infection – Alters metabolic and hormonal functioning that mimics aging, causes hypertension and memory impairment – Irritability, slow performance impaired, creativity, concentration and communication
The Effects of Sleep Loss Spring and fall time changes – higher accidents and traffic fatalities
Sleep Theories Sleep theories 1.Sleep protects 2.Sleep helps recuperation 3.Memory storage 4.Sleep and creative thinking 5.Sleep and growth
Insomnia Persistent problems falling asleep Effects 10% of the population Primary versus Secondary Insomnia
Narcolepsy Suffer from sleeplessness and may fall asleep at unpredictable or inappropriate times. Directly into REM sleep Less than.001 % of population. Click above to see Skeeter the narcoleptic dog.
Sleep Apnea A person stops breathing during their sleep. Wake up momentarily, gasps for air, then falls back asleep. Very common, especially in heavy males. Can be fatal.
Night Terrors Wake up screaming and have no idea why. Not a nightmare. Most common in children (boys) between ages 2-8.
Somnambulism Sleep Walking Most often occurs during the first few hours of sleeping and in stage 4 (deep sleep). If you have had night terrors, you are more likely to sleep walk when older.
Dreams Theories 1.Freud’s Theory of Dreams 2. Activation Synthesis Theory 3. Information Process Theory 4. Physiological Function 5. Cognitive Development
Freud’s Theory of Dreams Dreams are a roadway into our unconscious. Manifest Content (storyline) Latent Content (underlying meaning)
Activation-Synthesis Theory Cerebral Cortex is trying to interpret random electrical activity we have while sleeping. Why dreams sometimes make no sense. Biological Theory – Areas that process visual images (not in visual cortex) and limbic system are active, but not the frontal lobe
Information-Processing Theory Dreams are a way to deal with the stresses of everyday life. We tend to dream more when we are more stressed.
Physiological Function Theory Brain stimulation from REM sleep may help develop and preserve neural networks Newborns neural networks develop rapidly & newborns spend much of sleep time in REM
A Lifetime of Sleep
Cognitive Development Theory Dreams are part of brain maturation and cognitive development Dreams draw on our concepts and knowledge Dreams get more complex as we age – Before age 9 dreams like a slide show and less like an active story
Critical Considerations: Does not address the neuroscience of dreams.
REM Rebound REM Rebound - REM sleep increases following REM sleep deprivation Dreaming serves a biological function YOU need your REM SLEEP!
Hypnosis A heightened openness to suggestion
Hypnosis Posthypnotic suggestion – a suggestion made under hypnosis to be carried out later Relieved Headaches, asthma skin stress related skin disorders, Useful in treating obesity
Research on Hypnosis Hypnotically age-regressed people act as they believe children would, but outperform real children. Memories retrieved from hypnosis are combination of fact and fiction Authoritative people can induce people to perform unlikely acts
Hypnotic Theories 1. Role Theory Hypnosis is NOT an altered state of consciousness. Different people have various state of hypnotic suggestibility. Social influence theory - A social phenomenon where people want to believe Good hypnotic subject Work better on people with richer fantasy lives. 2. State Theory Hypnosis is an altered state of consciousness. Dramatic health benefits It works for pain best.
Divided Consciousness Theory 3. Divided Consciousness Theory/Dissociation Theory (Ernest Hilgard) - A split between different levels of consciousness Ice Water Experiment. Participant dissociates pain from emotional suffering people expect….or Social Influence theory Participant just playing “good hypnotic” subject and ignored pain