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Stages of Sleep – Consciousness (PSY)

by Tarry Ahuja, MD
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    When we’re not alert, we’re tired and we’re going to sleep. And so, sleep is really important in terms of managing our level of A, consciousness and our cognitive ability. We know that if you aren’t getting good sleep and if you aren’t getting the appropriate amount of sleep, this is going to really impact your cognitive ability and your ability to function. So, stages of sleep are clearly distinguished and studied using a sleep test or a polysomnogram. So, again, this is something that’s near and dear to my heart because I’ve spent a lot of time working in a sleep disorder clinic and we work with patients and we have them come in and they come for sleep studies, where they spend the night and we connect. We connect them with a whole bunch of electrodes. And on this figure, you can see some of the places that you’d place the electrodes so you’d have your EEG, which measures brain activity or brain waves, then you have the EOG or electrooculogram. This measures eye movements. And then we also have the EMG, which measures muscle tension in your face. So what we’ll do is hook these people up and it allows us to understand a lot of different things. It allows us to understand what stage of sleep we’re in, and we’re going to go through those in just a moment. And it’s going to allow us to understand the amount of brain activity that’s happening. So a PSG or a polysomnogram is a multimodal technique used to measure physiological processes during sleep. So I just highlighted a couple of the different modes of information and one was the EEG, which is electrical activity, EMG is skeletal muscle movements, and then we have EOG, which is eye movements....

    About the Lecture

    The lecture Stages of Sleep – Consciousness (PSY) by Tarry Ahuja, MD is from the course Making Sense of the Environment.


    Included Quiz Questions

    1. Polysomnogram
    2. Electroencephalogram
    3. Electromyogram
    4. Electrocardiogram
    5. Polygraph
    1. REM stage
    2. NREM stage 1
    3. NREM stage 2
    4. NREM stage 3
    5. NREM stage 4
    1. His EEG would show 3-7 Hz waves.
    2. His eyes would be fully closed.
    3. His eyes would be moving behind his eyelids.
    4. His EEG would show rapid, high amplitude waves.
    5. His current sleep stage makes up 45% of total sleep time.
    1. His EEG will also show slow rise and fall waves.
    2. His EEG will also show 8 - 13 Hz waves.
    3. It is the most restful stage of sleep.
    4. He is having paradoxical sleep.
    5. It is the shortest stage of sleep.
    1. Decreased NREM stage 3 sleep
    2. Increased REM sleep
    3. Increased NREM stage 1 sleep
    4. Decreased NREM stage 2 sleep
    5. Increased NREM stage 3 sleep

    Author of lecture Stages of Sleep – Consciousness (PSY)

     Tarry Ahuja, MD

    Tarry Ahuja, MD


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