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Stress (Defenition (Seyle 1956 (The nonspecific response of body to any…
Stress
Defenition
Seyle 1956
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Chrousos
Above a threshold intensity, any stressor elicitys nonspecific stress syndrome
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When a perceived discrepancy between a setpoint and information about actual level elicits compensatory responses to decrease discrepancy
Distress
subclass of stress
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cognitive recognition of an aversive condition , evidenced by motivation for learning to escape/avoid stressor
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Can be part of positive feedback loop, but not necessarily caused by homeostasis
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Contradictory findings
- in response to a sudden unexpected noise, heart rate generally decelerates and EEG changes to high frequency, low voltage activity.
- in response to strong acute stress, blood pressure and heart rate strongly increase, followed about 20 seconds later by an increase in adrenaline levels, and about 20 minutes later by a rise in cortisol levels.
- physiological responses are usually strongest to the first stimuli and rapidly diminish thereafter.
- the higher the heart rate and blood pressure of subjects at baseline, the smaller the changes measured in during task performance.
- heart rate and skin conductance can both be increased during one task, but during another task heart rate may decrease while skin conductance increases.
- correlations between measures are low