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Chapter 5

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PSYC 1010
Myriam Mongrain

Nov22003 CHANAPSNotes From ReadingCHAPTER 5 VARIATIONS IN CONSCIOUSNESSIOn The Nature of ConsciousnessAIntroduction1Consciousness is the awareness of internal and external stimuli and includesaYoure awareness of external eventsbYoure awareness of internal sensationscYoure awareness of self as the unique being going through these experiencesdYour awareness of your thoughts about these experiencesBVariations in Levels of Awareness1Conscious and Unconscious are different levels of awarenessCThe Evolutionary Roots of Consciousness1Consciousness may have allowed ancestors to think through courses of action and their consequences and then choose the best course but no concrete answerDConsciousness and Brain Activity 1Electroencephalograph EEGdevice that monitors the electrical activity of the brain over time by means of recording electrodes attached to the surface of the scalp ie Summarizes the rhythm of activity of the brain brain waves24 Types of Brainwaves based on frequencybeta alpha theta and delta3Variations in consciousness re correlated with variations in brain activityIIBiological Rhythms and SleepAThe Role of Circadian Rhythms 1Biological rhythms are periodic fluctuations in physiological functioning Implies existence of biological clocks2Circadian rhythms are the 24 hour biological cycles found in humans and many other species3When the retina is exposed to light it sends direct inputs into the SCNthe central pacemaker located in the hypothalamusBIgnoring Circadian Rhythms 1Quality of Sleep Suffers2Fatigue Sluggishness and Irritability3Negative impact on productivity accident proness quality of work social relations and physical and mental healthCMelatonin and Circadian Rhythms1Hormone Melatoninregulates human bio clock May be effective as a mild sedative to treat insomniaIIIThe Sleep and Waking CycleAConducting Sleep Research 1Used to monitor SleepaElectromyograph EMGrecords muscle activity and tensionbElectrooculographrecords eye movementsBCycling Through the Stages of Sleep1Stages 1 a brief transitional stage of light sleep that lasts only a few minutes aBreathing and heart rate slow muscle tension and body temp go downbAlpha Waves are replaced with theta waves cHypnic jerks may occur2Stages 24 respiration rate heart rate muscle tension and body temp continue to fall 15
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