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psy301 group presentation- sleep pptx

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Physiological Aspects of Sleep BY: Sara Merkle, Sarah Layliev, Sagar Gopalani Introduction ↖ Sleep is a state of rest- it is when both humans and animals go from a conscious state to a deep unconscious state ↖ It is an insistent urge of sleepiness that forces us to seek out a quiet, warm, comfortable place; lie down and remain there for several hours. ↖ Sleep cycles occur about every 90 minutes ↖ Adults need 7-9 hours of sleep, one year olds need 11
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  Physiological Aspects of Sleep   BY: Sara Merkle, Sarah Layliev, Sagar Gopalani  Introduction ↖ Sleep is a state of rest- it is when both humans and animals go from a conscious state to a deep unconscious state ↖ It is an insistent urge of sleepiness that forces us to seek out a quiet, warm, comfortable place; lie down and remain there for several hours. ↖ Sleep cycles occur about every 90 minutes ↖ Adults need 7-9 hours of sleep, one year olds need 11-14 hours and school age children need between 8-10 hours of sleep  Stages of Sleep Awake ↖ There are two different patterns of activity- alpha activity and beta activity. ↖ Alpha activity- smooth electrical activity; generally associated with a state of relaxation. While alpha waves sometimes occur when a person’s eyes are open, they are much more common when a person’s eyes are closed. ↖ Beta activity- irregular, low-amplitude waves; usually associated with a state of arousal. Beta waves show desynchrony and reflects the fact that many different neural circuits in the brain are actively processing information. Desynchronized activity occurs when a person is alert and attentive to events in the environment or is thinking actively.- The preoptic area (a region of the anterior hypothalamus) is the brain region most involved in the initiation of sleep. It contains neurons whose axons form inhibitory synaptic connections with the brain’s arousal neurons. When preoptic neurons become active, they suppress the activity of our arousal neurons, and we fall asleep.  Stages of Sleep Stage 1 Sleep -There is the presence of theta activity.- This indicates that the firing of neurons in the neocortex is becoming more synchronized.- Stage 1 sleep is considered the transition between sleep and wakefulness- During this stage, the eyes open and close and they roll upwards and downwards.
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