Unit 2 Test Flashcards
(277 cards)
Consciousness
The subjective awareness of internal and external events
-Very subjective: feel one’s self typing, thinking about a text hoping to get later
-How we interpret fire alarm: each bring out our experiences to interpretation
Attention
Internal processes used to set priorities for mental functioning
Prioritizing is adaptive
-Selective reflects limitations on how much the brain can process at one time
-priorities
Automaticity
Processing without attention
Fast and effortless processing that requires little or no focused attention
-When you do something enough/practice, can do without focus
-A skilled athletic or artistic performance
-When a process is more automatic, the less likely you are to be consciously aware of it.
-extremely adaptive
Biological rhythms
Biological rhythms: cyclical patterns in many body functions.
-ex: Sleeping/waking, Body temperature, Hormone secretions , Blood pressure, Menstrual cycle, Appetite, and Metabolism rate.
-Many of these are circadian rhythms (activities that rise and fall along a 24-hour cycle)
Biological clocks
-Biological clocks: Brain structures (esp. in the hypothalamus) that control biological rhythms
-Hypothalamus regulates biological clock
-Our environment synchronizes these (esp. daylight and darkness, which also follow a regular cycle).
-Sleep cycle coordinated with light and darkness
Melatonin
Melatonin: hormone that initiates sleep
Naturally excreted, especially before bedtime, tells body it’s time to sleep
Sleep
Sleep involves a change in one’s state or level of consciousness
Level of consciousness changes when we sleep
Sleep by the 1950’s
By the 1950’s, sleep researchers using EEGs revealed regular, cyclic changes in brain activity (brain waves) during sleep
Stages of Sleep
4 Overall Cycles
-3 Non-REM cycles (Stages 1, 2, 3)
1 REM cycle
3 Non-REM Cycles
-Stages 1, 2, and 3
Stage N1, N2, N3
-preceded by Alpha waves: the brain is in a relaxed, possibly drowsy state
-Stage N1: Theta waves appear
Light sleep; person may claim to still be awake
-Stage N2: Sleep spindles, K complexes
Asleep but may respond to some events, such as noises, patterns of waves spike
-Stage N3: Delta (slow wave) activity
Very deep sleep; nonresponsive to most stimuli and slow to awaken
Slow waves
REM sleep Stage/Cycle
REM sleep: Begins approx. 70-90 minutes into the first sleep cycle, earlier in later cycles (people’s eyes closed, but under people’s eyes are moving as they would be awake)
-Changes in physiological patterns
-REM sleep sometimes called “paradoxical” sleep
Paradox: person is asleep but EEG results show someone who is awake
Physiological Pattern Changes during REM Sleep
Changes in physiological patterns including:
-Increased heart rate
-Darting eyes
-Twitching, but muscle tone is extremely relaxed (“paralyzed”)
-EEG results show electrical activity resembles waking state
Duration of Sleep Cycle
One Cycle (~90 minutes)
-Progresses from N1 to N3 (light to deep sleep). Measures of arousal decline (e.g., heart and respiration rates, blood pressure)
Then reverses, from N3 to N1
Lastly, followed by REM sleep
-Cycle repeats 4-5 times a night
-Duration of REM lengthens in successive a cycles
Functions of Sleep
-Repairing/restoring helps repair normal wear and tear on body and brain
-Muscles to relax, recover, and repair
-Survival value, from our evolutionary heritage: Limits our activity when low light puts us at risk for predators and other dangers
-Consolidation of memories
-Retention of learned information
What is the function of REM Sleep
-Most dreams occur during REM sleep
-The loss of significant amounts of REM results in little drastic impairment
Frued’s View on Dreams
Freud – “the royal road to the unconscious,” a mechanism for wish fulfillment, to symbolically act out wishes, desires.
Freud believed dreams were a vital part of understanding someone: vital way of accesses one’s unconscious experiences
-Manifest content: the actual symbols of the dream
-Latent content: the hidden desires/ fears they represent.
-Little scientific evidence, and symbolism can be very subjective.
-Activation-synthesis hypothesis
Manifest Content
Manifest content: the actual symbols of the dream
-What is actually in one’s dream
Ex: Bulldozer
Latent Content
Latent content: the hidden desires/ fears they represent.
-What the dream represents
Ex: Bulldozer represents dad who didn’t listen
Activation-synthesis hypothesis
Freud
Activation-synthesis hypothesis: dreams are the result of random activity in the hindbrain as interpreted by higher brain centers.
-Hindbrain generates impulses and produces random firing, higher functioning parts of the brain like forebrain and cerebral cortex interpret these actions
Function of Dreams
-Dreams process events of day preceding sleep
-Everyone dreams, but people only occasionally remember their dreams
Dyssomnias
Dyssomnias: problems with the amount, timing and quality of sleep
Insomnia
Type of Dyssomnia
Insomnia: difficulty starting or maintaining sleep
-Can be related to stress, emotional problems, substance use (including caffeine), medical conditions.
Can be affected by caffeine, substance use, alcohol
-May be learned.
-Can be developed
-People with PTSD
Hypersomnia
Type of Dyssomnia
Hypersomnia: excessive sleepiness during waking hours
-Possible genetic factors, infectious diseases, emotional problems, substance use, sleep apnea
-People take antidepressants that make them more sleepy
-Sleep apnea: constantly waking up during sleep
Sleep apnea
Sleep apnea: constantly waking up during sleep