Sleep - ASK
a periodic, natural loss of consciousness, as distinct from unconciousness resulting from a coma, general anesthesia, or hibernation
Circadian Rhythm and Suprachiasmatic Nucleus and Jet lag
our biological clock; regular bodily rhythms (for example, of temperature and wakefulness) that occur on a 24-hour cycle.
-tempurature goes up in the morning, peaks during the day and drops in the evening- thinking is sharpest when approach peak of circadian arousal
-altered by age and experience
-larks (morning peak) older or owl (evening peak) younger.
alert, punctual creative, smart
Controlled by the Suprachiasmatic Nucleus (SCN) in the hypothalamus, which responds to light to reset the cycle, produces melatonin, an sleep inducing drug.- suppress pineal gland's production.
Disruptions lead to jet lag- Jet lag is a combination of fatigue and other symptoms caused by travelling abruptly across different time zones, messes up melatonin production, and irregular sleep patterns, impacting mood, alertness, and cognitive abilities.
Dual processing and blindsight
Parallel processing and sequencial processing
Dual processing: the principle that information is often simultaneously processed on separate conscious and unconscious tracks. “high road-consciousness” and “low road-unconsciousness”.
Blindsight: a condition in which a person can respond to a visual stimulus without consciously experiencing it.
Parallel processing: processing multiple aspects of a stimulus simultaneously.
-unconcious, routine behavior, automatic, quick.
Sequential processing: processing one aspect of a stimulus or problem at a time; generally used to process new information or to solve difficult problems.
-when faced with novel problem- focused attention required, slower but more concious.
States of consciousness and how they occur
Increases due to stronger stimuli, more parts of the brain making you more conscious-Not all forms of awareness are the same:
Conciousness- awareness of what is happening inside and outside the individual
Subconcious- right below your level of awareness but concious- thoughts and ideas.
Unconcious-A deeper level of awareness containing the thoughts and desires we have no true or direct knowledge of.
-spontenous- Daydreaaming, drowiness, dreaming
-physiologically-hallucinations, orgasm, food or oxygen starvation
-Psychologically- sensory deprivation, hypnosis and meditation.
Stages of Sleep:
-Awake - NREM1 - NREM2 - NREM 3 - NREM2 - REM - NREM2 - NREM3 - NREM2 - REM
90 minutes for one cycle
non-rapid eye movemment sleep; encompasses all sleep stages except for REM sleep-
-Body repairs and regenerates tissue
Builds bone and muscle
Appears to strengthen immune system
-periods of deep sleep diminishing and REM sleep periods increasing in duration in each cycle
Stage 1 sleep/light sleep
heartbeat and breathing slow down, muscles begin to relax, lasts a few minutes. alpha waves, the relatively slow brain waves of a relaxed, awake state, periods of brief movement, hallucinations, hypnagogic sensations, has theta waves—slower and more irregular than alpha waves.
Altered states of conciousness
Altered States of Consciousness are any conditions that differ significantly from a normal waking state, affecting awareness and perception.- stages of sleep, hyponisis, mediation and prayer, psychoaavtive drugs, daydreaming, states of unconcioussness- ex. coma
hypnagogic sensations and hallucinations
two g
s- gravity, glide
bizzare experiences, such as jerking or a feeling of falling or floating weightlessly while trasniting to sleep (also called hypnic sensations)
false sensory experiences, such as seeing something in the absence of an external visual stimulus- Ex: falling sensation, floating sensation, during stage 1
Stage 2 sleep
heartbeat and breathing slows further, no eye movements, body temperature drops and sleep spindles are produced -25 min During \relaxed muscles, Sleep spindles, bursts of rapid, rhythmic brain-wave activity that aids memory processing
EEG patterns showing more synchronized brain activity.
Cognitive Neuroscience
The interdisciplinary study of the brain activity linked with mental processing (thinking, knowing, remembering, and communicating)
Stage 3
deepest sleep state, heartbeat and breathing at it's slowest, no eye movements,body is fully relaxed with long delta waves. deep sleep, tissue repair and cell growth- immune system strengthens and muscles restore
REM SLEEP
(Rapid eye movement sleep)the primary dreaming stage, eye movements rapid, breathing and heart rate increased, limbs become temporarily paralyzed and brain activity is increased -paradoxical sleep: in dreams, motor cortex active but most messages blocked by brainstem, genitals aroused, as if real events.- paraylzation may linger when wake up, sleep paraylsis.
What affects our sleep patterns? ASK IF NEED KNOW- biology and ennviroment
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Sleep theories:
1. Sleep protects: darkness is dangerous
2. Sleep restores: body & brain a chance to repair, rewire, and reorganize
3. Sleep helps restore and rebuild our fading memories of the day’s experiences.
4. Sleep feeds creative thinking.
5. Sleep supports growth: slow wave sleep = pituitary gland release growth hormone needed for muscle development
6. Sleep conserves energy: inactive at night = sleep preserves our energy for waking times.
Effects of a lack of sleep:
Brain: loss of focus/attention/memory consilidation, depress
Immune system: suppress immune cell production, viruses
Fat cells: Cortisol hormone(Stress hormone) causes metabolism to slow down and increased production of fat. Obesiety
Heart: risk of high blood pressure
Stomach: produces hunger hormone grehlin and reduces supressing,leptin
Muscles: reduced strength, slower reaction time and motor learning.
1.5c- Sleep loss, sleep disorders, and dreams-
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Insomnia
a sleep disorder that causes recurring problems in falling and staying alseep- results in depression, obesity, hupertension, arithic and fibromyalgia pain - experiences in 1/5 adults
aggriated by sleeping pills and alcholol, ruin REM sleep
Narcolepsy
think narcotics , Nap for a lapse of time
a sleep disorder characterized by uncontrollable sleep attacks- the affected person may lapse directly into REM sleep, inopportune times- 5 minutes long
in 1/2000 adults
symptoms: constantly tired, sleep paralysis, hallucinations and bouts of muscle weakness.
Sleep Apnea
charechteruzed by temporary cessations of breathing during sleep and repeated momentary awakening
in 1/20 adults
Somnambulism A
(Sleep walking) motor behavior during stage 3 1-15 in 100
REM sleep behavior disorder- ASK and check death part
a sleep disorder in which normal REM paraylsis does not occur; instead, twitching, talking, or even kicking or punching mat occur, often acting out one's death- speaking
-mostly older men
Dreams
a sequence of images, emotions and thoughts passing through a sleeping person's mind (REM)- wake during or short after- remember it
Theories about dreams: Why do we experience them? What are their functions?
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Sigmued Freud- ASk about what need to know
writing of the interpretation of dreams- proposed dreams provide a psychic safety valve that discharges otherwise unacceptable feelings-contains manifest (remembered dream, the story) contact and latent content hidden meaning, unconscious thoughts during the dream,wishes, fantasies, etc. which are expressed in disguised form through the manifest content- experience dreams for our own wishes
-LACKS: any specific support, dreams may be interpreted in many different ways.
information processing. theory -BIO
that dreams are important because they help us process information from the day- fire away memories- sort and fix, consolidate day's experiences
Flaw: why dream about unexperienced things?
Psychological function theory -BIO
the dreams are meant to develop and preserve neural pathways- physiological functions, providing brain with periodic stimulations- in doing this it expands pathways- Ex: infants sleep In REm a lot
-Does NOT explain why we experience meaningful dreams
Activation Synthesis theory Q: why brainstem?
Dreams are brain's attempt to make sense of neural static, evokes visual memories and puts it into a story. Limbic= emotions
-Tells us something about the dreamer? How stories play out and how think
Coginition development theory
Dreams reflect cognitive development- they are part of the brain's maturation. When younger than nine, slide-show dreams, no like a sotry or movie
-dreams overlap with waking cognition and speech
-they simulate reality by drawing on ourj concepts and knowledge
-intensified mind-wandering
-top down control, not bottom up.
DOES NOT address neuroscience of dreams.
REM rebound
the tendency for REM sleep to increase following REM sleep deprivation
-experienced by mammals= biological and our behavior is influence by learning- fits consolidation theory
stress, or drug or alcohol use that causes a person to have more REM sleep than normal
1.3b: The Neuron and neural firing: substance use disorders and psychoactive drugs
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Psychoactive Drugs
a chemical substance that alters the brain, causing changes in perception and moods.
Ex: Advil, Expresso, Adderal, drinks
Substance Use Disorder and effect based on
a disorder charecterized by continued substance use despite significant life disruption
effects depend on
-drugs biological effects (how it changes the brain)
-user's expectations vary in social and cultural contexts
Ex: one culture things drug produces euphoria, another not.
When is something a substance use disorder?
3-4 mild, 4-5 moderate, 6 plus severe
Control: uses more substance or for longer than intended, unsucessfully regulating it and spends much time acquiring, using and recovering from effects- craves it.
Social: disrupts commitments, continues despite social problems and reduced social recreation work activities
Hazard:continues despite hazards or worsening physical and physological health
Drug action: experiences tolerance, withdrawal when try to end
Tolerance
when the brain chemistry adapts to offset the drug's effect (Neuroadaptation)
-to experience same effect, require larger dose, and increase risk of addiction, substance use disorder
Addiction
caused by increasing doses of psychoactive drugs, including prescription pain killers. Craves drug, continuing despite adversities and struggling when trying to withdraw (want drug more than like)
4-alchohol disorder (23 chance)
9-marijuana
21-cocaine
68-tobacco
group support and therapy helps, or belief that person can overcome it.
Psychoactive drug types
depressants, stimulants and hallucinogens. They all affect the brain's synapses and stimulate , inhibit or mimic neurotransmitters, blocking reuptake, increase sensation and euphoric high, but then when eventually drug disappears, crash because change so large and sudden.
Depressants
drugs that reduce neural activity and slow down body functions
Ex: alcohol- barbiurates, opiods
Alchohol
Initial high followed by relaxation and disinhibition
- depression, memory loss, organ damage, impaired reactions.
Barbituates - need know EX?
drugs that depress CNS activity, lower anxiety and impair memory and judgement. They are tranquilizers. They induce sleep and reduce anxiety
Ex: Nembutal, Seconal???
Opiods
opium and its derivatives; depresses neural activity, lessening pain and anxiety temporarily Ex: Heroin, substitute medically peerscribed meth, or pain relief narcotics
Ex: Oxycoton, morphine, fentenyl (synthetic)
-pupils contract, breathing slow, pleasure temporary as brains stops producing endorphins. when withdraw a ,lot of pain, lack in natural opiods
Stimulants
drugs that excite neural activity and speed up body functions (pupils dilate, heat and breathing goes up, blood Sugar up
Ex: Caffeeine, Nicotine, cocaine, amphetamine, methamphetamine speed and ecstasy
- feel alert, loose weight, boost mood or athletic preformance (if miss, get headache, irritated, depressed)
Nicotine- ASK
Stimulant- arousal and relaxation- sense of well-being.
-heart disease, cancer.
Ex: tobacco products likecigarettes, vapes, cigars, pipes, snuff and e-cigs- tar in other, not this, so more people use, help to transition off smoking, fruity flavors for teens
Heroin
A depressant that provides a rush of euphoria; a relief from pain- depressed pysciology, agonizing withdrawal.
Caffeine
a stimulant that increases alertness- and wakefulness
-anxiety, restlessness and insomnia in high doses-uncomfortable withdrawal
Methamphetamine
a stimulant that provides euphoria, alertness- and energy
-irratability, insomnia, hypertension, seizures.
Cocaine
a stimulant that gives a rush of euphoria, confidence and energy.
-cardiovascular issues, suspiciousness, deppressive crash.
Ecstasy (MDMA)
a stimulant and mild hallucinogen that gives one emotional elevation and disinhibition.
-Dehydration, overheating, depressed mood, impaired cognitive and immune functioning.
Marijuana
A mild hallucinogen that enhances sensation, relieves pain and warps time- relaxes.
-impaired learning or memory, risk of psychological disorders, lung damage.
hallucinogens
psychedelic (mind-manifesting) drugs that distort perceptions and evoke sensory images in the absense of sensory input, dissociation.
Near-death-experience
an altered stage of conciousness reported after a close brush with death- often similar to drug induced hallucinations.
LSD
created by chemistry Albert HUfmann and ingested, results in fanastic pictures, shapes with intense colors. Emotions range from europhia, detachment to panic. (influenced by mood and expectations)