Sleep - Sleep A Measuring Sleep Scientists measure sleep...

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Sleep A. Measuring Sleep -- Scientists measure sleep with the following: 1) Electroencephalogram (EEG) -- a device that measures the electrical activity of the brain. This is the measure scientists rely on most when determining which stage stage of sleep a person is in. When using the EEG, we look at each wave in terms of the: a) frequency - how many times the wave occurs within a specific period, and b) the amplitude - the size of the wave. These two submeasures help us identify wave types so that, in turn, we can identify different stages of sleep. 2) Electrooculagram (EOG) -- a device that measures eye activity. During different stages of sleep, our eyes move in distinct ways. For example, during slow wave sleep (SWS), we have slow, rolling eye movements, However, during REM sleep, our eye movements are much more rapid and occur in a sharp, back and forth way. The EOG is a vital tool for identifying REM sleep since the EEG in REM, wake and stage look so similar. But, when we combine the EEG and EOG it is easy to see the differences. 3) Electromyogram (EMG) -- this device is used to measure the muscle activity that occurs during sleep, and is particularly helpful when attempting to identify REM sleep. During REM sleep (as you will soon read), humans experience a type of temporary paralysis during which the EMG drops to almost nothing (close to a flat line). 4) Electrocardiogram (ECG or EKG) -- as you most likely know, the electrocardiogram is a measure of heart muscle contractions. 5) Temperature - body temperature is connected with sleep via the sircadian rhythms (your body's internal, biological clock). Although most people believe that the circadian rhythms are a function of time, they in fact work according to body temperature that fluctuates over a 24 (or so) hour period. So, our internal clock seems to function according to our body temperature that varies across a 24 hour period, and not strictly according to time. So, the clock showing 11:00 am does not influence a person's ability to sleep. ..the body temperature that occurs at that time of day is more important. B. Types of Sleep
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This note was uploaded on 12/04/2011 for the course PSY 2012 taught by Professor Scheff during the Fall '08 term at Broward College.

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Sleep - Sleep A Measuring Sleep Scientists measure sleep...

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