Exam 2 Flashcards
Consciousness
awareness of internal and external stimuli including external events, internal sensations, awareness of self, and awareness of thoughts about experiences. Overall tis a personal awareness.
Flow of Consciousness
William James. The wandering of the mind and how consciousness fluctuates continuously.
Differing levels of awareness
Freud suggested that this is Conscious vs Unconscious. Some awareness exists in sleep, therefore some mental processing occurs during sleep or under influence of anesthesia.
EEG
Electroencephalograph. Electrodes on scalp that measure electrical activity of the brain. Rhythm of cortical activity with line tracings called brain waves.
Four principle brain waves
Beta, alpha, theta, delta.
Beta Waves
13 - 24 cps
Alpha Waves
8 - 12 cps
Theta Waves
4 - 7 cps
Delta Waves
Under 4 cps
Biological Rhythms
Periodic fluctuations in physiological functioning. Many tied to planetary rhythms
Circadian Rhythm
24 hour biological cycle in humans and other species. Regulation of sleep is key in this rhythm. BP, urine production, hormonal secretions, and other physiological functions governed. Alertness, short-term memory, and other cognitive performance aspects.
Melatonin pathway.
Retina exposed to light sends signal to suprachiasmatic nucleus in thalamus. SCN sends signals to pineal gland which releases melatonin. Melatonin adjusts bio clocks.
Ignoring the circadian rhythm
Poor circadian rhythm. Jet lag is an outcome.
East-west disparity
Westward better. 2/3 day to adjust for each time zone. Eastward must adjust 1 day for each time zone.
Shift rotation
rhythm always at odds with schedule. heart disease, cancer, diabetes, ulcers. Not terrible if progressively later starting times are used and longer periods between shift changes.
Melatonin use
Regulates the biological clocks. Timing and dosage of melatonin is critical to realignment of clocks.
EMG
Electromyograph (muscular activity and tension)
EOG
Electrooculograph (eye movements)
EKG
Electrocardiograph (heart contractions)
Stages of Sleep
1-4 and REM
Stage 1
Brief transitional period of light sleep (10-12 mins). Alpha waves dominate before sleep. Theta become prominent. Breathing and HR slow.
Stage 2, 3, and 4
respiration rate, heart rate, muscle tension, and body T decline. Waves higher in amplitude and lower in freq.
Slow wave sleep
Stages 3 and 4. Low frequency delta waves. Stay for 30 minutes. Reach within an hour. Now cycle reverses.
REM
After stage 2 again, REM takes over. Lateral movements. Deep. Irregular breathing and pulse rate. Muscle tone relaxed and paralyzed. High freq beta waves. Dreaming is vivid, frequent, and memorable.
How many times does cycle repeat?
4 times. Rem lasts few minutes first time and goes up to 40-60mins. Descents into non REM get progressively slower. Slow wave sleep occurs early while REM piles up in second half. 15-20% slow wave and 20-25% REM. Varies greatly between people.
Newborn trends in sleep.
Newborns sleep 6-8 times a day for 16 hrs. 50% of sleep is REM but by 1 year old only 30%.
Adult trends in sleep
20% REM. Slow-wave and stage 1 increases. Older adults (60-80) get significantly less sleepiness during day than 18-30 year olds despite having 1.5 hrs less. Older adults tolerate deprivation better.
Sleep deprivation
Impairs reaction, attention, motor coordination, and decision making. Endocrine and immune system compromised. Bad at predicting when one will fall asleep.
Partial sleep deprivation/ sleep restriction
make do with substantially less sleep than normal over an extended period. Most americans no longer know what it is like to be alert.
Selective deprivation
Participants are awakened whenever certain something happens (REM or otherwise). Shows little impact on daytime functioning and task performance but effects sleep patterns. Can slip back into REM.
Rebound effect
When deprived or REM, more REM made up for later.
Memory consolidation
REM and Slow-Wave sleep contribute to firming up learning that takes place during day.
Neurogenesis
REM fosters this. Increased creativity after nap vs people whom don’t.
Sleep deprivation consequences
Hormonal changes that lead to hunger and obesity. Impaired immune. Diabetes risk. Hypertension. Coronary disease. 8 means death.
Insomnia
chronic inability to get adequate sleep. 30-35% report chronic issues but don’t seek treatment. Benzodiazepine sedatives.
Nonbenzodiazepine sedatives
Poor long range solution. Carry over effects such as sluggishness. Less effective over time. Escalating dependency. Withdrawal.
Narcolepsy
Sudden irresistible onsets of sleep. 0.05% REM dysfunction.
Sleep Apnea
Reflexive gasping for air that awakens a person and disrupts sleep. Stop breathing for minimum of 10 seconds. Hypertension, coronary disease, stroke.
Somnambulism
Sleep walking. 15% of children, 3% adults. Aggressive or sexual behavior.
Dreams
Mundane and universally 1st person. Sex, aggression, misfortune. Negative and traumatic. Self centered. Freud termed spilling over from day events to be “day residue” Affected by external stimuli.
Theories on Dreams
Wish fulfillment (Freud). Problem Solving (Rosalind Cartwright). Activation Synthesis (Hobson and McCarley).
Activation Synthesis
Hobson and McCarley. Neural activation random and dreams are a side effects. Cortex synthesizes dreams to make sense of signals.
Hypnotism
Systematic procedure that produces heightened state of suggestibility. Anesthesia, sensory distortions and hallucinations, disinhibition, and posthypnotic suggestions/ amnesia can result.
Theories
Hypnotic trance (no alterations in brain activity, so low evidence). Role playing (power of expectation), Altered state (real because of surgery with no drugs. Dissociation occurs, splitting mental processes into two separate streams of awareness).
Dissociation
Splitting mental processes into two simultaneous steams of awareness. Communication with hypnotists and external world split with hidden observer. People drive forever without realizing. Driver vs thoughts.
Meditation
Deliberate effort to alter consciousness. Styles include focused attention and open monitoring.
Focused attention
concentration of specific object, image, sound, or bodily sensation. Clear mind of clutter. Zen Buddhism.
Open Monitoring
Contents of one’s moment to moment experience in nonjudgemental way. Hinduism.
EEG recordings pick these up in meditation.
Alpha and theta waves.
Long term effects of meditation
Reducing stress, lower stress hormones, enhanced immune response, self esteem, mood and sense of control, tolerance for pain, permanent alterations in brain structure.
What is psychoactive drug?
modifies mental, emotional, or behavioral functioning.
Types of drugs
Narcotics, sedatives, stimulants, hallucinogens, cannabis, alcohol.
Narcotics/ Opiates
Capable of relieving pain. Heroin, morphine, codeine, demerol, methadone, oxycodone (oxycontin). Analgesic. Powerful high and euphoric “who cares.” Escape reality.
Sedatives
Sleep inducing drugs that decrease CNS activation and behavioral activity. Barbituates benzodiazepine sedatives. Downer drugs. Euphoria similar to drinking a lot of alcohol. Tension or dejection replaced by relaxed pleasant intoxication with loosened inhibitions.
Stimulants
CNS activity increased. Caffeine, nicotine, cocaine, amphetamines. Amphetamines made in lab. Able to do anything.
Hallucinogens
Effects on mental and emotional functioning. Distortions in sensory and perceptual experience. LSD
Cannabis
Marijuana, hashish, THC. Mild relaxed euphoria with sensory awareness enhancements. Hunger.
Alcohol
Ethanol. Relaxed euphoria that boosts self esteem. Inhibitions diminished. Impaired mental and motor functioning.
Drug effects vary due to
Multifactorial causation and subjectivity of experience.
Tolerance
progressive decrease in responsiveness to drug as a result of continued use.
Mesolimbic DA pathway.
Drugs increase activity on this pathway. Neural circuit from nucleus accumbens to prefrontal cortex.
Physical dependence
Need drug to avoid withdrawal.
Psychological dependence
continue to drug to satisfy intense mental and emotional craving.
Overdose
NS depressants (sedatives, narcotics, alcohol carry greatest risk) synergistic, so combo is bad.
Direct effects
Tissue damage, respiratory and pulmonary disease, psychotic disorders, increased risk for disease.
Indirect effects
Driving ability, IV users get infectious diseases.
K complexes
huge amplitude waves.
Sleep spindles
high freq and medium amplitude. Keeping people asleep. Clears mind of day’s activity for next day. More means higher IQ.
Stage 2 happenings
K complexes and sleep spindles. Lull to deep sleep.
Stage 3 happenings
0-49% delta waves. constructive interference so high amp.
Stage 4 happenings
High freq, low amp. Alpha and sometimes beta waves.
If awoken in SWS
groggy as hell. Eyes roll slowly up and down.
Paradoxical sleep
REM. High brain activity. But deep sleep. Form of being awake.
Purpose of sleep
Energy conservation. Protection against predators. Restore bodily resources. Cognition/ learning or memory.
How can sleep help with cognition?
As long as we go through cycles it’s cool. Nap do better on tasks. Pattern of sleep messed up.
Hypersomnia
non-refreshing sleep. Excessive sleepiness during day. Adolescence and people grow out of it.
Cataplexy
Muscle tonia while awake
Hypnogogic or Hypnopompic hallucinations
visual imagery before sleeping. Visual imagery after awakening.
Sleep paralysis
muscle tonia right before or right after sleep.
Binge
5+ on same occassion at least 1x/mos.
Std Drinks
10-12fl oz beer. 8-9 fl oz malt liquor. 5 oz table wine. 1 wine cooler. 3-4oz wine. 1.5fl oz shot of 80 proof. 0.6 fl oz alcohol.
Metabolism time
1 hr to metabolize 0.6oz alcohol
BAC
0.08 BAC = illegal to drive.
Learning
change in behavior or knowledge due to experience
Conditioning
learning associations between events that occur in environment
Classical/pavlovian conditioning
stimulus (CS) acquires capacity to evoke response (CR/UR) originally evoked by another stimulus (US).
Can classical conditioning cause physiological responses?
Yes. Immune suppression.
CR vs UR
CR weaker than UR. Can be same or different. Fear (CR) vs Pain (UR).
Evaluative conditioning
Liking of stimulus result from pairing stimulus with other positive or negative stimuli.
Acquisition
initial stage of learning response tendency.
Stimulus contiguity
stimuli that occur together in time and space.
Stand out!
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