PSYCH 111 Chapter Notes - Chapter 5: Endorphins, Mydriasis, Depressant

• School: U of M
• Department: Psychology
• Course: PSYCH 111
• Professor: Elizabeth Buvinger

Document Summary

Consciousness - awareness of internal and external stimuli. Continually changing stream of mental activity that varies along levels of awareness (conscious, preconscious, unconscious) Maintain some level of awareness during sleep (parents wake up to baby"s cries) Circadian cycles - internal clocks that mostly run on a 24-hour cycle. Functions of sleep: memory consolidation, energy conservation, helps restore bodily functions. Stages of sleep: light sleep, small irregular brain waves, sleep spindles-bursts of electrical activity, high peaking waves, deep sleep, delta waves, slow with high peaks, deep sleep, more delta waves. Cycles 1,2,3,4,3,2, rem sleepalternate on 90 minute cycles. Active brainwaves (high frequency, low amplitude), increased heart rate/blood pressure, limp muscle state. Rem periods get progressively longer throughout night. Development: newborns/infants: 50% rem, age 3-5: 20% rem, similar to adult. Sleep deprivation: decrease immune functions, hallucinations and perceptual disorders, less alert, more irritable, decline of ability to do simple tasks. Peter tripp: 200hr extreme sleep deprivationbrain went through sleep cycles while awake.