Grade Buddy PSYCH 111 1st Edition Lecture 10 Outline of Last Lecture I The Nervous System II The Spinal Cord III The Brain Outline of Current Lecture I Motivation II Sleep Current Lecture I Motivation Motivation deals with regulatory drives which are homeostatic mechanisms These mechanisms control your desire for food water sleep and sex which is a non regulatory drive The hypothalamus is the central drive system of the body and uses negative feedback loops to control the drive Afferent connections send directions from sensory neurons regarding drives to other ares of the body Efferent connections send directions to motor neurons to organize response to states of the body The lateral hypothalamus is where activity motivates drive related behavior The ventromedial hypothalamus is where activity leads to satiety The loop goes hungry lateral hypothalamus eat ventromedial hypothalamus satiation II Sleep There are 5 main stages in a sleep cycle The first stage is the transition from wakefulness to sleep Each stage following the first stage is a gradually deeper form of sleep Most of the REM or rapid eye movement sleep occurs during the last stages of sleep and it increases more each stage An electroencephalogram measures brain waves during sleep in the human body Beta waves are fast irregular waves that occur when someone is awake with their eyes focused They are high frequency low altitude waves Alpha waves are larger more regular waves that occur when someone is awake with their eyes shut They are low frequency high amplitude waves These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Theta waves occur during stage 1 and stage 2 of sleep During stage 1 they re low amplitude high frequency waves and during stage 2 sleep spindles and k complexes occur Delta waves are slow regular waves that occur during deep sleep Sleep cycles last approximately 90 minutes per cycle Thus the average person has 4 or 5 sleep cycles per 8 to 9 hours of sleep a night The most deep sleep occurs in the 1st and 2nd cycles of sleep The most REM sleep occurs during the later cycles of sleep The majority of deep sleep occurs in cycles The function of sleep is to restore energy and functionality to the body This is proven due to strenuous exercise leading to greater amounts of deep sleep The purpose of dreaming is to develop memory perception and remembrance during sleep
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