PSY100H1 Chapter Notes - Chapter 5: Theta Wave, Sleep Spindle, Suprachiasmatic Nucleus
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PSY100H1 Full Course Notes
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5. 1 biological rhythms of consciousness: wakefulness and sleep. Consciousness: a person"s subjective awareness, including thoughts, perceptions, experiences of the world, and self-awareness. Patterns that cycle within days, weeks, months, or years. Infradian rhythm: any rhythm that occurs over a period of time longer than a day. Ultradian rhythms: 90-120-minute cycles (e. g. urination, hormonal activities) Circadian rhythms: internally driven daily cycles of approximately 24 hours affecting physiological and behavioural process. Cells in the retina relay msgs about light levels in the environment to the scn. The scn communicates signals with the pineal gland. Info. about melatonin levels feeds back to the hypothalamus. Volunteer: extended period of time @ isolation chambers & cave expert. E. g. adults go to bed earlier and wake up earlier. Implication: cognitive testing old patients receive in hospitals ( ) Brain waves change over the course of the normal circadian rhythm. Measured by the frequency and amplitude of electrical activity. Frequency: number of up-down cycles every second.
