Lecture 7 Stress Flashcards
What is Stress?
Stress is a negative emotional experience accompanied by predictable biochemical, physiological, cognitive, and behavioural changes that are directed either toward altering the stressful event or accommodating to its effects (Baum, 1990).
Definition of Stressor
chemical or biological agent environmental condition, external stimulus or event that causes stress to an organism (Sato et al., 2006)
Types of Stressors
physical
psychological
acute
chronic
explain physical stressors
all animals (human and not): e.g., heat, cold, pain, fatigue, injury, hunger, predators.
explain psychological stressors
generally only humans: e.g., grades, job security, money, relationships, traffic, noise, crowding, commuting to work
explain acute stressors
demand immediate attention
But do not last long
appear suddenly
many physical stressors are acute
explain chronic stressors
do not require immediate attention
but last a long time and are constant source of worry
most psychological stressors are chronic
Hassles are minor life events that …
Have cumulative effect Reduce psychological well-being over short term Produce physical symptoms in long term Examples: Being stuck in traffic Waiting in line Doing household chores Having difficulty making a small decision
who was the discoverer of the “Stress Syndrome”
Hans Selye
explain General Adaptation Syndrome that Selye researched
Exposed rats to stressors; observed physiological responses
Found: all stressors, regardless of type, produced physiological responses:
Enlarged adrenal cortex
Adrenocortical response to stress (involves cortex)
Shrunken thymus and lymph nodes
Ulceration of the stomach and duodenum
Resembles: Activation of HPA axis
what does General Adaptation Syndrome most closely resemble
Activation of HPA axis
explain the General Adaptation Syndrome
non-specific response of the body to demand
Three stages:
what are the 3 stages of the General Adaptation syndrome
Alarm: organism becomes mobilized to meet demand
Resistance: organism makes efforts to cope
Exhaustion: organism fails to cope; depletes its physiological resources
what does Allostatic Load refer to
to fact that physiological systems within the body fluctuate to meet demands from stress called allostasis
EXPLAIN Allostatic Load
Based on Selye’s ideas
Process of achieving stability, or homeostasis, through physiological or behavioral change
Over time, allostatic load builds up
physiological costs of chronic exposure to fluctuating or heightened neural or neuroendocrine responses
what are the Allostatic Load Measurement/biomarkers
Decreases in cell-mediated immunity Inability to shut off cortisol in response to stress Lowered heart rate variability Elevated epinephrine levels High waist-to-hip ratio Decreased hippocampal volume Problems with memory High plasma fibrinogen Elevated blood pressure
what are the General Adaptation Syndrome criticisms
According to its critics, Selye’s model:
Does not consider psychological appraisal of stress (he tested rats!)
Assumes that responses to stress are uniform, but:
Not all stressors produce same endocrinological responses
How people respond influenced by personality, perception, biological constitution
explain stress appraisal Richard Lazarus & Susan Folkman
What matters is not what event occurs, but how we perceive and interpret that event.
appraisal
what are the steps to the The Stress Appraisal Process
primary appraisal secondary appraisal stress coping repraisal
explain primary appraisal from The Stress Appraisal Process
evaluate: Is it Positive, negative, or neutral? If negative, is it: Harmful, threatening or challenging?
explain secondary appraisal from The Stress Appraisal Process
evaluate if you have Sufficient coping abilities and resources?
what is Holmes & Rahe: Stressful Life Events (SLE)
tries to list what stressful events one will go through in their lifetime
what are the criticism on the stressful life events
Fails to consider individual differences in experience and reporting of events
(Primary appraisal)
Does not assess whether resolved or not
(Secondary appraisal)
Does not include ongoing life strain (chronic stress)