06 -- Chapter 9 Optional Homework ANSWERS

06 -- Chapter 9 Optional Homework ANSWERS - Chapter 9...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 9 Optional Homework 1. What three things are generally measured when someone is asleep—and what do they measure? EEG: overall electrical brain activity EOG: movement of the eyes EMG: muscle tone 2. In relation to the EEG, what differentiates awake, non-REM sleep, and REM sleep from each other? How do these waveforms differ from each other? Different EEG waves characterize the different stages of sleep and arousal: Beta waves: alert, awake; low amplitude, high frequency waves; desynchrony Alpha waves: awake, but very relaxed; eyes are usually closed; slightly higher amplitude than beta, lower frequency than beta waves Theta: light stages of sleep (i.e., Stage 1, Stage 2); higher amplitude then alpha, lower frequency than alpha Sleep spindles & K complexes: often occur during Stage 2 (and K complexes only during Stage 2); sleep spindles look like a spindle; K complexes are large amplitude, low frequency spikes (some say prelude to delta waves); K complexes only appear during Stage 2 Delta waves: highest amplitude, lowest frequency waves (Stage 3, Stage 4); only difference between REM sleep has desynchrony again and looks like Stage1 or even awake stages 3. Why do you think that REM sleep sometimes be referred to as paradoxical sleep ? Describe the characteristics of REM sleep (EEG? muscle tone? dreams?). Because it has characteristics of being awake (e.g., EEG desynchrony) as well as being asleep (behaviorally, they have their eyes closed and they have no muscle tone). REM: EEG looks like Stage 1 and/or being awake; desynchrony There is rapid eye movement. The movements look like the person is scanning their visual field. Some researchers found that there is a particular EEG waveform which appears during rapid eye movements during REM. The same waveform is seen when awake subjects scan a scene, but it is not seen by simply moving the eyes. There is no muscle tone during REM sleep. In fact, the brain actively paralyzes the muscles. REM is associated with vivid, narrative dreams.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4. There are some people who show evidence of REM (e.g., via EEG) and yet do not dream. There are others who say they dream but show no evidence of REM sleep. What does this suggest about the relationship between dreams and REM sleep? That one may not be causing the other. Researchers are still unsure of why there is this relationship 5. What are people like when you wake them up from Stage1/Stage 2 sleep? SWS? REM sleep? Stage 1/Stage 2: they may claim that they have not been asleep SWS: they will be difficult to awaken, and are groggy/disoriented when awakened REM sleep: they can be difficult to awaken (but meaningful stimuli can do this), and they are alert (as if they had been awake already) 6. Describe the pattern of sleep throughout the night. e.g., how do we cycle through the stages of sleep?
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/23/2009 for the course PSYC 402 taught by Professor Jenniloeb during the Spring '09 term at UNC.

Page1 / 11

06 -- Chapter 9 Optional Homework ANSWERS - Chapter 9...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online