PSYC 11762 Lecture Notes - Lecture 8: Myoclonus, Cerebrospinal Fluid, Theta Wave
20 Feb 2017
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Document Summary
Required for all mammals: switch between hibernation and sleep. Theories: adaptive- helps us survive, restorative- recharges energy bank. Using more energy needs more sleep time to recharge not true. Byproducts in cerebral spinal fluid around brain change during sleep: atp. Can be inconvenient: dolphins live underwater but breathe air. Sleep disorders show correlations with disorders like alzheimer"s and dementia. Eeg- electrodes measure brain (cortex) activity through the skull. Higher level consciousness- alert, attentive, actively thinking: beta waves- small in amplitude, with high frequency. Lower level consciousness- relaxed but awake daydreaming: alpha waves- taller and farther apart than beta waves. Stage 2: decreased muscle activity, low sensitivity, irregular eeg patterns: mostly theta waves, sleep spindles: high frequency bursts surrounded by theta waves, k complex: synchronized firing of all neurons at once. Stage 3 and 4: deep sleep, difficult to rouse, restorative: delta waves, slow wave sleep, stage3- theta and delta waves, stage4- mostly delta waves, sleep walking occurs during these stages.
