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We often assume that when people make poor decisions, it is because they lack intelligence, discipline, or awareness. That if they just “thought more clearly,” they would choose better. But this assumption ignores something fundamental, i.e., not all thinking happens in a neutral mind.
Sometimes, thinking happens in a mind that has been shaped by fear, unpredictability, and past pain. And when that happens, critical thinking is no longer just about logic. It becomes entangled with survival.
Trauma is not only what happens to a person. It is how the mind and body adapt in response to overwhelming experiences. These adaptations are not random, they are protective, but they come at a cost, and one of those costs is the distortion of perception.
Trauma affects key brain regions involved in thinking and decision-making. The amygdala becomes hyperactive, while the prefrontal cortex (the part responsible for reasoning, planning, and evaluation) becomes less effective under stress (American Psychological Association, 2020). This creates an imbalance: the brain becomes better at detecting danger, but worse at accurately interpreting it.
So the question shifts from, “Why is this person thinking irrationally?” to, “What is their brain trying to protect them from?”
Trauma does not just influence emotions. It shapes how reality is interpreted.
For example, someone who has experienced repeated betrayal may begin to expect it everywhere. Neutral situations may feel suspicious. Silence may feel like rejection. This is not because the person is incapable of thinking logically, but because their past experiences have trained their brain to prioritize threat detection over accuracy.
In cognitive psychology, this connects to cognitive distortions. Aaron Beck (1976) described patterns such as catastrophizing, overgeneralization, and emotional reasoning, where individuals assume that their feelings reflect objective truth. Trauma intensifies these patterns. It does not create them from nothing, but it makes them stronger, faster, and more automatic.
This is where critical thinking begins to break down, not because the individual lacks the ability to think critically, but because their internal system is biased toward survival rather than reflection.
Another important factor is memory. Trauma affects how memories are stored and retrieved. According to research by Bessel van der Kolk (2014), traumatic memories are often fragmented, emotionally intense, and easily triggered. When triggered, they can override present-moment awareness, causing the individual to respond to past threats as if they are happening now.
This has direct consequences for reasoning. If the brain is reacting to the past while believing it is responding to the present, then the conclusions drawn in that moment will not be accurate. They will be protective.
And protection does not always align with truth.
Stress further complicates this process. Under high stress, the brain shifts into a more reactive mode. The prefrontal cortex becomes less active, while emotional and habitual responses take over (American Psychological Association, 2020). This is why even individuals who are capable of deep, logical thinking may struggle to do so in emotionally charged situations. It is not a failure of intelligence but a shift in brain function.
This changes how we define critical thinking. It is no longer just the ability to analyze arguments or identify logical fallacies. It is the ability to recognize when your thinking is being shaped by something deeper. It is the ability to pause and ask:
These questions are not easy. In fact, they require the very thing trauma disrupts: a sense of safety.
As long as the brain remains in a state of heightened threat sensitivity, thinking will continue to be shaped by that state. Improving reasoning is not only about learning logic. It is also about regulating the nervous system, processing past experiences, and rebuilding a sense of internal safety.
Only then can our thinking become clearer and our perception become more accurate.
In the end, trauma does not make a person incapable of critical thinking. It makes their thinking adaptive to a different reality, one where safety is uncertain, and vigilance is necessary.
The goal, then, is not to judge that thinking. It is to understand it. And from that understanding, slowly begin to question it.
References (APA Style)
American Psychological Association. (2020). Stress effects on the body.
