Ch6_ppt_-_States_of_Consciousness_Compatibility_Mode_

Daylight mainly sufferers may be sensitive to light

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Unformatted text preview: easons of the year (mainly in Fall or Winter; < daylight) (mainly Sufferers may be sensitive to light (treated by phototherapy) M. Bassil PSYC 202 9 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 11/4/2009 Sleep & Dreaming STAGES OF SLEEP Every Every 90 minutes of sleep, we cycle through different predictable stages (of (of physiological responses & brain activity ) Physiological responses (body begins to “shut down”) Physiological Heart rate is lowered • Respiration is lowered • Minimum muscle activity • Body temperature drops • Brain waves become more irregular & slower M. Bassil PSYC 202 10 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 11/4/2009 Stages of Sleep - Awake, alert EEG Recording Beta waves (15-30 cps) Stages of Sleep - Relaxed, drowsy EEG Recording Alpha waves (8-12 cps) 11 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 11/4/2009 Stages of Sleep – Stage 1 - EEG Recording Lasts few minutes May May experience dreams, vivid images, sudden body body jerks Theta waves (6 CPS) Stages of Sleep – Stage 2 EEG Recording Sleep Spindle - 1-2 sec bursts rapid activity - 12-15 cps - Muscles Muscles are more relaxed, slower breathing & heart rate, harder harder to wake - May dream 12 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 11/4/2009 Stages of Sleep – Stage 3 (slow wave sleep) EEG Recording Delta waves - 0.5-2 cps (very slow, but large) - Start occurring more often - When When dominate ► stage 4 Stages of Sleep – Stage 4 (slow wave sleep) EEG Recording Delta waves - Body Body is relaxed, brain activity decreased, harder to awaken, may dream dream - 20-30 min later, EEG pattern 30 changes back to stages 3 & 2 ► spend little time in each 13 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 11/4/2009 Stages of Sleep – REM (60-90 min after going to sleep) EEG Recording - - Rapid Rapid Eye Movement (every ½ min), high arousal, & f requent dreaming frequent Waves similar to when alert Theta Beta - If If awakened during REM ► report dream - Brain Brain sends signals for body muscles to relax (paralyzed) ► REM sleep paralysis sleep ► Paradoxical sleep Stages Stages of Sleep Cycle thru stages 4-5 times; stages 1, 2, 3, & 4 times; become shorter & dwindle; REM becomes longer & more more frequent 14 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 11/4/2009 Sleep & Brain Mechanisms We don’t have a single “sleep center” Base forebrain brain Base of forebrain & brain stem regulate falling asleep regulate (neurons in reticular formation activate other brain systems reticular activate controlling controlling different aspects of REM) Intense Intense activity in limbic system, amygdala limbic amygdala Primary motor cortex active but movement signals blocked Association cortex near visual cortex active visual images near Decreased Decreased activity in prefrontal...
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This document was uploaded on 01/15/2014.

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