consciousness. what is consciousness? it is the awareness of things inside and outside ourselves it...
TRANSCRIPT
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Consciousness
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What is Consciousness?
• It is the awareness of things inside and outside ourselves
• It cannot be seen, touched, or looked at directly
• There are different ways of looking at consciousness
• There are different levels of consciousness
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Meanings of Consciousness• Sensory awareness – you
are aware of the sights, sounds, noises, and smells around you
• Selective attention – being able to screen out some stimuli to focus on a particular stimulus (paying attention in class)
• Direct inner awareness – you are aware of thoughts, emotions, images, and memories without using your senses – they are inside of you
• Sense of self – you are aware of yourself and your existence as a unique individual
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Levels of Consciousness
• Conscious
• Preconscious
• Unconscious
• Non-conscious
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Conscious
• People are aware of themselves, their thoughts, and perceptions
• You are conscious when you are aware of your awareness
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Preconscious
• Your preconscious is where all of the information goes that you can recall if necessary
• This is where you store memories, experiences, random bits of information, etc.
• They are not always in your awareness, but you can become aware of them by focusing your attention on them
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Unconscious
• Sometimes called the subconscious
• This is where information gets stored that you are not able to become aware of
• You may repress painful memories here, or socially unacceptable urges and impulses
• Freud believed your actions were heavily influenced by the information you store in your unconscious
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Non-Conscious
• Most of your biological functions happen at this level – you do not have to think about them for your body to continue doing them
• You may not even be aware they are happening
• Heartbeat, pupils dilating, your fingernails growing, breathing
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Altered States of Consciousness
• Occurs when a person’s sense of self or sense of the world changes
• You may no longer be aware of what is going on around you• Sleep, hypnosis, drug-induced state
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Sleep and Dreams
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Some Background Information
• Humans spend about 1/3 of their lives asleep
• The amount of time we spend asleep depends on our circadian rhythms, or biological clocks
• Body temperature, brain activity, and blood pressure change significantly when we are sleeping
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The Stages of Sleep
• Every stage of sleep has a different brain wave pattern
• When we are alert, the brain emits beta waves (short and quick)
• When we are relaxed, the brain emits alpha waves (a little longer and slower)
• Stage 1 (light sleep) – brain waves slow down more to theta waves– People might see vivid images
that they can recall if they are awakened
– Lasts about 30-40 minutes
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The Stages of Sleep (cont.)• Stage 2 (moderate sleep) – brain
waves continue to slow more, becomes harder to wake people up
• Stage 3 (deep sleep) – brain waves slow down to delta waves, pretty hard to wake someone up
• Stage 4 (deepest sleep) – brain waves are at their slowest, it is very hard to wake someone up at this level
• After about 30 minutes at stage 4, people begin to move back up the stages to 3, then 2 and 1
• People will return to stage 1 about 90 minutes after they fall asleep
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REM Sleep
• REM – Rapid Eye Movement• Occurs after people complete a
sleep stage cycle, brain produces waves similar to those made in stage 1
• Blood pressure goes up, breathing becomes irregular, heart beats faster, and eyes move quickly from side to side
• People complete about 5 sleep cycles when they sleep for 8 hours – REM sleep becomes longer with each cycle
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Why Do We Sleep?
• Sleep helps the body recover physically by reviving tired muscles and organs as well as boosting resistance to infection
• Sleep also helps people deal with psychological health, like stress
• People sleep more when they are under more stress
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Randy Gardner
• 17 year old who stayed up for almost 11 days without any sleep
• Became very irritable• Could not focus his eyes
and had difficulty speaking• Had memory lapses,
hallucinations, and delusions
• Took Gardner several days to return to normal circadian rhythm
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Dreams
• EVERYONE dreams, but some people have more difficulty remembering their dreams than others
• We have the most vivid dreams during REM sleep
• People can dream in black & white or in color
• Many dreams have plots and vivid images and often involve people we know
• Scientists and psychologists are not sure why we dream and they disagree about the meaning of dreams
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What Do Dreams Mean?
• Freud thought that dreams reflected your unconscious urges and desires – because some of the things in our unconscious are painful or undesirable, we symbolize them in our dreams
• Biological psychologists believe we dream because our neurons fire at random during sleep and our brain tries to make sense of this jumble of messages
• There is no agreed-upon set of rules for interpreting dreams
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Insomnia
• This is the inability to sleep, people tend to experience it when going through periods of anxiety or tension
• It can worsen if you try too hard to fall asleep
• Occasional insomnia is pretty common and usually goes away on its own
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Nightmares and Night Terrors• Most people have had
nightmares, and certain themes in nightmares are fairly common
• People who are anxious or depressed tend to have more nightmares – they occur during REM sleep
• Night terrors are more severe than nightmares and occur during stage 3 & 4 sleep – people usually do not fully wake up during night terrors
• They usually occur in young children whose nervous system has not developed
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Sleepwalking
• Many children walk during stages 3 and 4 of the sleep cycle
• They may hold conversations with people, but if awakened they will not remember what they said or did
• Most people outgrow sleepwalking
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Sleep Apnea
• Occurs when people stop breathing temporarily during sleep because their air passages are blocked
• Causes the body to jolt out of deep sleep, though people may not wake up
• Can lead to tiredness throughout the day, high blood pressure, heart attacks, and strokes
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Narcolepsy
• Is very rare, occurs when people fall asleep any time, anywhere
• Can be extremely dangerous and is usually treatable with drug therapy and frequent naps
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Drugs and Consciousness
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How Do Drugs Affect the Body?
• Different types of drugs affect the body in different ways
• All drugs cause the nervous system to function abnormally
• Some drugs are addictive, causing the body to crave them just to feel normal
• Some drugs are connected to the development and progression of serious diseases
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Depressants - Alcohol
• Depressants slow the activity of the nervous system and generally make people feel relaxed
• Alcohol and narcotics are depressants
• Alcohol causes intoxication, which can include slurred speech, blurry vision, balance problems, and lack of concentration
• Causes a lack of judgment and impaired coordination
• Long-term alcohol addiction can lead to liver failure, cancer, and heart problems
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Depressants - Narcotics
• Used to relieve pain and induce sleep – decrease the activity of the CNS while stimulating pleasure receptors, are very addictive
• Morphine, heroin, and codeine are narcotics• Withdrawal symptoms from narcotics often include, nausea,
chills, vomiting, tremors, rapid heartbeat, and physical pain
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Stimulants - Nicotine• Stimulants speed up nervous
system activity• Nicotine is a very common
stimulant that reduces appetite and boosts metabolism
• Nicotine is as addictive as heroin but its effects and withdrawal symptoms are not as severe
• Cigarettes are responsible for more deaths per year in America than suicide, homicide, alcoholism, car accidents, drug overdoses, and AIDS combined
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Stimulants - Amphetamines
• Amphetamines help people stay awake and cause a reduction in appetite by making the body produce more neurotransmitters and slowing their absorption
• High doses can have effects that last for several days, after which a person crashes both physically and psychologically
• Some people experience terrifying hallucinations and delusions while taking amphetamines
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Stimulants - Cocaine• Cocaine produces feelings of pleasure and reduces hunger – it
deadens pain and makes people feel more self-confident• It also causes insomnia, headaches, body tremors, nausea,
hallucinations, convulsions, and delusions• Puts a major strain on the heart
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Hallucinogens - Marijuana
• Hallucinogen is a drug that produces hallucinations
• Marijuana produces mild hallucinations and feelings of relaxation by slowing the CNS
• It also decreases coordination, impairs judgment and memory, and can cause anxiety and confusion
• Often raises blood pressure and heart rate greatly
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Hallucinogens - LSD
• Much stronger than marijuana and produces more intense hallucinations – causes neurons in brain to send messages to the wrong destination, overloads the brain with messages
• Hard to predict the effects LSD will have when someone takes it
• Side effects include violent outbursts, self injury, panic attacks, and flashbacks that occur sometimes years after use
• Can permanently change the chemistry of the brain
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Drug Abuse Treatments
• Detoxification – removal of the drug from the body, helps to wean addicts off of the drug while restoring health to the body
• Maintenance programs – people are given a less dangerous substance to substitute the more harmful drug (methadone clinics)
• Counseling – can be conducted individually or in a group setting
• Support groups – people meet in groups for emotional and moral support (AA, NA, etc.)