Lecture 07 (old word version)

Lecture 07 (old word version) - Tuesday February 12 th...

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Tuesday, February 12 th State of consciousness Consciousness : the subjective experience of perceiving oneself and other entities. Psychologists have argued what consciousness is for years. Books will have variance of this definition. Ex. If you are asleep, you are unconscious. You do not perceive your environment around you and you do not have a perception of yourself. Question: How much sleep do you think you need? Effects of three nights without sleep: Temperature and reasoning decrease each night and from one day to the next. On graphs: decrease in core body temperature over the course of three days without sleep. Consequences of sleep depriva t ion (video) - Doctors, ambulance staff, or other emergency workers: long hours affect health, psychological and physical performance, which ultimately can affect patient care. - People need to sleep in order to be healthy. It is physically and mentally unhealthy. - 16-60% of car accidents involve sleep deprivation. - Increase stress levels, anxiety and depression in those with little sleep. Sleep deprivation - MRI pictures: in those who are sleep deprived, there is little brain activation as opposed to those who are not sleep deprived.
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Rhythms - Circadian rhythms – cycles of activity and inactivity generally lasting about one day - Cycles of activity that occur about a day in length. - Our internal clock works on about a 24-hour period. - Certain hormones are released (more in the morning) - Temperature is low in the morning - Question: Are you a morning person? As one ages, the earlier he/she wakes up. Usually, younger people are night people, older people are morning people. Shifting sleep schedules - Jet lag o Time difference. For example, if you left Michigan and went to California, you would have to adjust three hours behind (7pm in MI = 4pm in CA). o It would be harder to adjust from California to Michigan than from Michigan to California because it’s easier to stay up three hours later rather than to wake up earlier. Our circadian rhythm adjusts itself. o It would be easier to for someone to go from working a midnight to 8am shift to working an 8am to 4pm shift. o It is more difficult for a person who regularly works an 8am to 4pm shift to work a midnight to 8am shift. o It’s much more difficult to ask your body to wake up earlier.
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Brain mechanisms - The suprachiasmic nucleus (SCN) controls the sleep-wake cycle in part by regulating the secretion of the hormone melatonin by the pineal gland. - Hypothalamus: region of brain responsible for the release of hormones. - The central circadian clock is located in the suprachiasmic nucleus in the brain. - Info coming into the optic chaisism : light. Light is the most important influence on the SCN. Light can reset the firing of these cells. -
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This note was uploaded on 03/19/2008 for the course PSY 101 taught by Professor Jackson during the Spring '08 term at Michigan State University.

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Lecture 07 (old word version) - Tuesday February 12 th...

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