Stress: When a Survival Mechanism Works Against Us?
Stress: When a Survival Mechanism Starts Working Against Us
Stress has long become a part of everyday life. It is associated with work, speed, uncertainty, and the constant need to stay “online” and active. At the same time, stress is often perceived exclusively as a negative state—something that should be eliminated as quickly as possible. However, from the perspectives of psychology and physiology, stress is, in fact, an adaptive mechanism designed for survival.
The problem is not when stress arises, but when it does not end. It is not short-term tension that gradually begins to affect a person’s thinking, memory, and emotional state, but chronic stress.
What is stress from a scientific perspective?
The concept of stress was introduced into science in the 1930s–1940s by the Canadian physiologist Hans Selye. He viewed stress as the body’s universal response to any physical or psychological demands from the environment.
Selye emphasized that stress in itself is not harmful: it mobilizes resources and helps the organism adapt to change.
He also distinguished between short-term adaptive stress and long-term tension, which he described as “exhaustive.” This distinction became the foundation for later research into the psychological effects of stress.
How does stress activate in the body?
When a person encounters danger or a high level of demand, a rapid response system is activated. The body releases hormones that increase energy levels, sharpen attention, and speed up reactions. This state helps a person act quickly and efficiently.
However, if the stress response persists over time, the body remains in a state of heightened readiness. As a result, systems designed for short-term mobilization begin to operate at the limit of their capacity, leading to exhaustion.
Stress and thinking: what happens to cognitive processes?
Research shows that short-term stress can temporarily improve concentration and reaction speed. But with prolonged exposure, the picture changes. Chronic stress reduces cognitive flexibility, impairs working memory, and makes decision-making more impulsive.
In this state, it becomes harder to maintain attention, analyze information, and consider the long-term consequences of one’s actions. Thinking gradually shifts toward simplified solutions and avoidance-based responses.
Experimental evidence: stress and working memory
One notable study was conducted in 2009 under the leadership of Elizabeth Phelps. Participants were asked to perform working-memory tasks under experimentally induced stress.
The results showed that task performance decreased under stress, especially in situations requiring both the storage and processing of information at the same time. The researchers concluded that stress narrows cognitive resources and limits the capacity for complex mental processing.
Allostatic load: the cost of chronic stress
The American neurobiologist Bruce McEwen introduced the concept of “allostatic load.” It refers to the cumulative physiological and psychological “wear and tear” that results from prolonged stress. His research demonstrated that chronic tension affects not only emotional states but also brain structures involved in memory and self-regulation.
Importantly, these changes do not occur suddenly. They accumulate gradually, which makes chronic stress particularly dangerous: a person may not notice the changes for a long time, attributing them to fatigue or age.
Why does stress distort the perception of reality?
Under constant tension, the brain begins to assign greater importance to potential threats. This leads to an increase in anxious interpretations and a reduced ability to notice neutral or positive aspects of situations.
From a psychological standpoint, stress shifts attentional focus: instead of analysis and choice, the person moves into a “defensive mode.” This mode is useful in moments of real danger, but it becomes problematic in everyday life, where flexibility and reflection are required.
When does stress become chronic?
A key factor in chronic stress is the sense of lack of control. Research shows that the same level of demand can affect people differently depending on whether they feel they have influence over the situation.
If stress is perceived as temporary and manageable, its negative effects are significantly reduced. When it is experienced as constant and unavoidable, the risk of cognitive and emotional exhaustion increases.
Stress is not an enemy—it is a signal
It is important to emphasize that stress is not a system failure. It is a signal that resources are being expended faster than they are restored. Attempts to completely “eliminate” stress are often ineffective because they ignore its adaptive function.
From a psychological perspective, a more productive approach is learning to recognize stress responses, manage load, and maintain a balance between tension and recovery.
Conclusion
Stress is not merely emotional tension; it is a complex psychophysiological process that directly affects thinking, attention, and decision-making. It can be beneficial in the short term, but under chronic exposure, it begins to work against the individual.
Understanding stress as an adaptive yet limited mechanism allows us to move beyond the simplistic idea that “stress is bad” and to engage more consciously with our own resources. It is precisely this balance that is key to maintaining cognitive and psychological health in modern life.