PSYC 2230 Lecture 77: PSYC 2230 Lecture 77
24 Jan 2018
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Document Summary
Stage 2 sleep is characterized by the presence of: Sleep spindles - 12- to 14-hz waves during a burst that lasts at least half a second. K-complexes - a sharp high-amplitude negative wave followed by a smaller, slower positive wave. If, however, the local defenses are inadequate or fail to limit the effects of the stressor, resistance finally gives way to the third. Stage of exhaustion stage, which selye termed the stage of exhaustion. In this stage the reaction to the stressor becomes general again. Corticoid levels rise very similarly to their rise during the alarm reaction. Once local adaptive responses have been established, a second stage, which selye te=ed the stage of resistance, develops. Stage of resistance this period, the processes accelerated during the alaml reaction drop back almost to no=al levels (e. g. , corticoid levels decrease to just slightly above normal). The pontomesencephalon is a part of the brain that contributes to cortical arousal.
