Ture of the challenge comes before a stress reaction. Lazarus also developed the idea of coping as he realized humans usually act to avoid or lessen unpleasant situations. People presumably balance the demands of the task against the alternatives and resources they have at hand to determine their relative relevance. When one has controllable problems, a
coping mechanism follows to help one conquer the external threat and/or control the emotional pain it generates. A stress reaction arises only when self-regulating capacity falls short.Other challenges to the conventional wisdom of stress as a broad and stereotyped reaction also arose. In some bodily systems, Sterling and Eyer (1988) coined the term
allostasis to explain the mechanisms allowing for suitable variability in response to changing demands, so ensuring homeostatic stability in the rather few bodily systems that have to be maintained within limited bounds. Modern stress research thus notes the diversity of stress responses and connects physiological and psychological viewpoints (Aldwin, 2009; Cohen et
With the idea of allostasis the focus moved
from the mechanisms preserving equilibrium to those allowing adaptation; that is, how flexible variation in some systems is actually needed to ensure steady functioning. Adaptation is a continuous process.Maintaining stability through variety is the process of allostasis (Cohen, Kessler, & Gor).When stress builds to a level that compromises the ongoing adaptation capacity of some physiological system, autonomically controlled processes like the heart rate
arinad occurs in a state of relaxed preparation.Reduced adaptive capacity in one system forces other systems to overcompensate, increasing their load and finally compromising the functional integrity of the whole organism. Four conditions are found as routes to allostatic overload: too frequent exposure to some given adaptive demand; failure to accommodate to
recurrent stressors; failure to recover after stressor exposure; and too little response in one adaptive function, which requires other systems to overcompensatee responsive to a subtle range of inputs from the environment (Thayer & Lane, 2000). Such fluctuation results from the undisturbed operations of the internal feedback system Bernard and Cannon described (see
Thayer This is accomplished when the prefrontal
cortex may participate in conscious processing of emotional content, therefore regulating limbic system activity (Brosschot, Gerin, & Thayer, 2006; Dickerson & Kemeny, 2004; Heatherton, 2010; Thayer & Lane, 2009). Presented with a perceived threat, prefrontal inhibition of the amygdala releases, allowing threat signals to enter the central autonomic network (Thayer, 2006; Thayer, Åhs, Fredrikson, Sollers, & Wager, 2012; Thayer & Lane,
2000). The system temporarily loses control and responds not to the usual spectrum of stimuli from the surroundings. The heart rate at the sinoatrial node reflects this stiffness by relative dominance of slower sympathetic over quicker parasympathetic nerve signals (Thayer & Lane, 2000, 2009).People obviously adapt constantly also in a psychological sense: they stop
at the red light, work hard at their jobs, ignore the radio while having a conversation, and so forth. The cognitive-transactional model and the idea of coping gave a structure for a perspective of people as active in processing and adjusting to external pressures (Lazarus, 1993). Coping is the deliberate cognitive and behavioral efforts a person uses to control difficulties and the related sense of stress (Aldwin, 2009; Lazarus, 1966; Lazarus & Folkman,
Cognitive flexibility and conscious control
will reduce when the capacity to cope with a stressful situation does not suffice; the scope of attention will narrow and go towards the source of the treat (Chun, Golomb, & Turk-Browne, 2010; Fredrickson, 2001; Lupien, Maheu, Tu, Fiocco, & Schramek, 2007; Öhman & Mineka, 2001). Automatic reaction systems will be ready for quick execution and the emotional state will move towards negative valence (Fredrickson & Branigan, 2005; Lovallo, 2005;
MacDonald, 2008; Öhman & Mineka, 2001). Long ago, studies on stress and health focused mostly on these activating behaviors. More contemporary viewpoints, however, agree that the link between stress and health effects depends on what follows a demanding event.Roads towards illness and wellnessUsually, adaptation to temporary difficulties is not difficult; in fact, it is essential to keep health (McEwen, 1998, 2019). That insight has caused the emphasis in
stress research to shift to more fully incorporate the adaptation or failure of adaptation to non-threatening environments (Brosschot, 2010; Dickerson & Kemeny, 2004; Linden, Earle, Gerin, & Christenfeld, 1997; Thayer & Lane, 2000). When conditions allow, the allostatic processes should revert within a range reflecting relaxed preparation (Linden et don, 1997; Lovallo, 2005; McEwen, 2019; Sterling & Eyer, 1988). Sterling and Eyer (1988) introduced the idea
Conclusion
are in constant adaptation rather than having a fixed set-point. Unlike the homeostatic perspective, the allostatic one regards a healthy state as involving high responsiveness and appropriate predictive fluctuation in expectation of changing needs (Juster et al., 2010).To guarantee a consistent supply of oxygen to the brain, the cardiovascular system must, for example, control blood pressure predictively as a person decides to get out from a chair. The
allostatic viewpoint thus emphasizes even more that adaptation is a whole-body process requiring both higher and lower functions of the brain.be seen as represented to different degrees and through different mechanisms in the restorative environments and mindfulness approaches. The restorative environments approach mainly targets environmental exposure,
stress recovery, and restoration of depleted adaptive capabilities. The mindfulness approach mainly targets accommodation to stressors, stress recovery, and enhancement of adaptive capabilities through training. When conditions are unchallenging, a well-functioning allostatic system is marked by reinstatement of self-regulation capabilities and attunement to the more subtle range of variation in experience from moment to moment
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