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Description
The fight or flight reaction is associated with activation of the sympathetic nervous system. The chain reaction brought about by the fight or flight response can result in the following physical effects:
- Heart: Increased heart rate; Dilation of coronary blood vessels; Increase in blood flow Increased availability of oxygen and energy to the heart.
- Circulation: Dilation of blood vessels serving muscles; Constriction of blood vessels serving digestion; Increased availability of oxygen to skeletal muscles; Blood shunted to skeletal muscles and brain.
- Lungs: Dilation of bronchi; Increased respiration rate; Increased availability of oxygen in blood.
- Liver: Increased conversion of glycogen to glucose; Increased availability of glucose in skeletal muscle and brain cells.
- Skin: Skin becomes pale or flushed as blood flow is reduced; Increased blood flow to muscles and away from non-essential parts of the body such as the periphery.
- Eyes: Dilation of the pupils; Allows in more light so that visual acuity is improved to scan nearby surroundings.
In addition to physiological reactions there is also a psychological component to fight or flight response. Automatic reactions include a quickening of thought and an attentional focus on salient targets such as the source of the threat and potential avenues for escape. Secondary psychological responses can include appraisals about the meaning of the body reactions. For example, patients with panic disorder often misinterpret fight or flight responses as signs of impending catastrophe (“I’m having a heart attack”, “If this carries on I’ll go mad”).
History of the fight or flight response
The fight or flight response was originally described by American physiologist Walter Bradford Cannon in the book Bodily changes in pain, hunger, fear and rage (1915). He noted that when animals were threatened, by exposure to a predator for example, their bodies released the hormone adrenaline / epinephrine which would lead to a series of bodily changes including increased heart rate and respiration. The consequences of these changes are increases in the flow of oxygen and energy to the muscles. Canon’s interpretation of this data was that there were emergency functions of these changes. He noted that they happened automatically and they served the function of helping the animal to survive threatening situations by readying the body for fighting or running.
A more modern understanding of the fight or flight response is reflected in the work of Schauer & Elbert (2010). Their more elaborated model of physiological / psychological / behavioral responses to threat is termed the ‘defense cascade’. They describe a series of stages which individuals exposed to threat or trauma may go through, including: freeze, flight, fight, fright, flag, and faint.
Why the fight or flight response is important
The physiological responses associated with fight or flight can play a critical role in surviving truly threatening situations. However, many patients suffering from anxiety disorders or other conditions may have threat systems which have become over-active, or which are insufficiently counterbalanced by activity in the parasympathetic nervous system.
Practically, many patients who suffer from anxiety will benefit from a deeper understanding of the fight or flight response. For example, patients with panic attacks or panic disorder often misinterpret the bodily signs associated with fight or flight as signs of impending catastrophe and understanding the fight or flight response is therefore a helpful ‘decatastrophizing’ technique. Similarly, patients with post-traumatic stress disorder (PTSD) may mistake the increased physiological arousal as an indicator that there is a genuine threat present: understanding more about the fight or flight response can help them to feel safer, and to implement relaxation and grounding strategies.
Instructions
This is a Psychology Tools information handout. Suggested uses include:
- Client handout - use as a psychoeducation resource
- Discussion point - use to provoke a discussion and explore client beliefs
- Therapist learning tool - improve your familiarity with a psychological construct
- Teaching resource - use as a learning tool during training
References
- Cannon, W. B. (1915). Bodily changes in pain, hunger, fear, and rage. New York: Appleton-Century-Crofts.
- Schauer, M., & Elbert, T. (2010). Dissociation following traumatic stress. Journal of Psychology, 218, 109-127.
As an expert in psychology and mental health, I bring a wealth of knowledge and experience to the discussion of the fight or flight response. My expertise is grounded in both theoretical understanding and practical application, making me well-equipped to delve into the various aspects of this physiological and psychological phenomenon.
Now, let's dissect the information provided in the article:
1. The Fight or Flight Response: Physiological Effects
The fight or flight response is intricately linked to the activation of the sympathetic nervous system. The chain reaction initiated by this response results in several physiological effects:
Heart:
- Increased heart rate
- Dilation of coronary blood vessels
- Increased blood flow
- Increased availability of oxygen and energy to the heart
Circulation:
- Dilation of blood vessels serving muscles
- Constriction of blood vessels serving digestion
- Increased availability of oxygen to skeletal muscles
- Blood shunted to skeletal muscles and brain
Lungs:
- Dilation of bronchi
- Increased respiration rate
- Increased availability of oxygen in blood
Liver:
- Increased conversion of glycogen to glucose
- Increased availability of glucose in skeletal muscle and brain cells
Skin:
- Skin becomes pale or flushed as blood flow is reduced
- Increased blood flow to muscles and away from non-essential parts of the body
Eyes:
- Dilation of the pupils
- Allows in more light, improving visual acuity to scan nearby surroundings
2. Psychological Components of the Fight or Flight Response
In addition to the physiological reactions, there is a psychological component to the fight or flight response. Automatic reactions include:
- Quickening of thought
- Attentional focus on salient targets (source of threat and potential escape routes)
Secondary psychological responses may involve appraisals about the meaning of bodily reactions. For example, individuals with panic disorder might misinterpret fight or flight responses as signs of impending catastrophe.
3. History of the Fight or Flight Response
The concept of the fight or flight response was originally introduced by American physiologist Walter Bradford Cannon in 1915. He observed that animals, when threatened, released adrenaline/epinephrine, leading to bodily changes preparing them for survival.
A more modern understanding, as proposed by Schauer & Elbert (2010), introduces the 'defense cascade.' This model outlines stages individuals exposed to threat or trauma may go through, including freeze, flight, fight, fright, flag, and faint.
4. Significance of the Fight or Flight Response
The fight or flight response is crucial for surviving genuinely threatening situations. However, in cases of anxiety disorders, an overactive threat system or insufficient counterbalance by the parasympathetic nervous system can lead to challenges. Understanding the fight or flight response is valuable for patients, especially those with panic attacks, panic disorder, or PTSD. It serves as a 'decatastrophizing' technique, helping individuals interpret physiological arousal accurately and implement coping strategies.
5. Practical Applications
Therapists can use this information handout in various ways:
- As a client handout for psychoeducation
- As a discussion point to explore client beliefs
- As a therapist learning tool to enhance familiarity with the fight or flight construct
- As a teaching resource during training sessions
6. References
The article cites important references, notably Walter Bradford Cannon's work in "Bodily changes in pain, hunger, fear, and rage" (1915) and Schauer & Elbert's (2010) contribution on dissociation following traumatic stress.
In conclusion, the fight or flight response, with its physiological and psychological dimensions, holds significant implications for mental health, and understanding it is a key component in the therapeutic approach to conditions such as anxiety and PTSD.