Some people seem to walk into a stressful presentation, a tense conversation, or a public evaluation and simply stay steady, while everyone around them visibly rattles. It’s tempting to write that off as fixed temperament, either someone has it or they don’t. Two experiments that measured the body’s actual stress response, not just how people described feeling, suggest composure is closer to a trainable skill than a fixed trait.
The clearest evidence comes from a 2012 study by Jeremy Jamieson, Matthew Nock, and Wendy Berry Mendes, published in the Journal of Experimental Psychology: General. Fifty adults went through the Trier Social Stress Test, a well-established lab stressor involving an impromptu speech and a surprise mental-math task performed in front of stone-faced evaluators. Before the test, participants were randomly assigned to either reappraise their physical arousal as functional and helpful, redirect their attention elsewhere, or receive no special instruction. Participants who reappraised their arousal showed a measurably different physiological pattern than the other two groups, lower vascular resistance and higher cardiac output, the signature of a “challenge” response rather than a “threat” response. They also showed less attentional bias toward threatening words afterward and rated their own coping resources higher. A few minutes of reframing, given right before the stressor, changed how their body actually responded to it.
A second study helps show that a longer period of training produces an even larger shift, in people who specifically struggled with anxiety. In a 2013 randomized controlled trial by Elizabeth Hoge and colleagues, published in the Journal of Clinical Psychiatry, 93 adults diagnosed with generalized anxiety disorder were randomly assigned to either eight weeks of mindfulness-based stress reduction or an active control program matched in time and format but without any mindfulness content. Both groups then went through the same Trier Social Stress Test. Subjective distress during the test dropped from 53.2 to 28.7 in the mindfulness group, nearly cut in half, compared to a much smaller drop, from 50.5 to 39.4, in the control group. State anxiety followed the same pattern, falling further in the mindfulness group. Sixty-six percent of mindfulness participants were rated much or very much improved, compared to 40 percent in the control condition.
Together, these two studies suggest that staying unfazed under pressure is less about a fixed disposition and more about specific, learnable responses to stress as it happens. Jamieson, Nock, and Mendes’s research shows that even a brief reappraisal, delivered right before a stressor, can shift the body’s physiological response in real time. Hoge and colleagues’ research shows that sustained training over eight weeks produces a substantially larger effect, nearly halving subjective distress during a live, evaluative stressor compared to an equally structured but non-mindfulness program. Between the two, composure under pressure looks like a skill that operates on two timescales, a quick reframe that helps in the moment, and a longer practice that changes the baseline.
It’s worth being honest about what these two studies don’t establish. Jamieson, Nock, and Mendes’s research measured a single stress exposure in a controlled lab setting, and while the physiological shift was real and significant, it’s not yet clear how long that effect lasts or how it holds up outside a lab. Hoge and colleagues’ trial specifically studied people with diagnosed generalized anxiety disorder, so while the pattern is encouraging, the size of the benefit may look different in people without a clinical anxiety diagnosis.
Within those honest limits, the research offers a genuinely useful two-part picture for anyone who wants to stay steadier under pressure. In the moment, reframing the body’s stress response as useful rather than dangerous appears to shift what’s actually happening physiologically. Over time, sustained mindfulness practice appears to lower reactivity more substantially still. Being unfazed, in other words, isn’t a trait some people simply have. It’s closer to a response that can be practiced.