What happens in your brain under pressure (and how to rewire it)

The monitor blared a high-pitched alarm. The patient's blood pressure was dropping, fast. In the sterile, controlled environment of the operating theatre, chaos threatened to erupt. For a fleeting moment, I felt the familiar grip of fear, the cold clench in my stomach. My heart rate spiked, and my vision narrowed. It was the classic stress response, a biological inheritance designed for survival on the savannah, not for the demands of modern surgery.

But then, years of training kicked in, for all of us. I took a single, deep breath. I ran through the steps in my head. The anaesthetist spoke in a calm, clear voice, tasks were shared out, and each of us did our part. Within minutes, the patient was stable. The crisis was averted, not through panic or brute force, but through a deliberate, practised management of our own responses to pressure.

This experience is not unique to the operating theatre. Leaders in every field face their own high-stakes moments: a critical negotiation, a make-or-break presentation, a sudden market crash. In these moments, how well you lead depends not just on your knowledge or experience, but on your ability to manage what is happening inside your own brain.

Pressure and the amygdala hijack

To perform under pressure, you first need to understand what happens in your brain when you feel stressed. The key player is a small, almond-shaped structure called the amygdala. The amygdala is your brain's alarm system, constantly scanning for threats. When it perceives one, whether a predator on the savannah or a tough question from a board member, it triggers the release of stress hormones like adrenaline and cortisol.

This is what's known as the "amygdala hijack". The surge of stress hormones prepares your body for "fight or flight". Your heart rate increases, your breathing becomes shallow, and blood is diverted from your brain to your muscles. This was useful for our ancestors, but it is less helpful when you need to think clearly and strategically.

The problem is that the amygdala hijack effectively shuts down your prefrontal cortex (PFC). The PFC is the most evolved part of your brain, responsible for executive functions like rational thinking, problem-solving and emotional regulation. When the amygdala is in control, your access to your PFC is limited. You become more impulsive, more reactive and less able to think clearly. You are, quite literally, not thinking straight.

Rewiring your brain for resilience

The good news is that you are not a slave to your amygdala. With conscious effort and practice, you can learn to manage your stress response and stay in control, even in the most challenging situations. Here are some practical techniques to help you do that.

1. The breath: The simplest tool for managing your stress response is your breath. Under pressure, your breathing naturally becomes shallow and rapid. This tells your brain that you're in danger, further activating your amygdala. By consciously slowing your breathing, you can reverse this process.

Box breathing is a technique used by military personnel and athletes to stay calm under pressure. It involves a simple, four-step process:

• Inhale slowly for a count of four.
• Hold your breath for a count of four.
• Exhale slowly for a count of four.
• Hold your breath for a count of four.

Repeat this cycle for a few minutes, and you will feel your heart rate slow and your mind begin to clear. Regulating your breath signals to your amygdala that the threat has passed, allowing your PFC to come back online.

2. Mindfulness and the gap: Mindfulness is the practice of paying attention to the present moment without judgement. It creates a space between a stimulus and your response. In a high-pressure situation, that space is critical. It lets you move from a reactive, amygdala-driven state to a more considered response.

Research suggests regular mindfulness practice may reduce stress reactivity. Even a few minutes each day may help you handle pressure better.

3. Visualisation and mental rehearsal: Good surgical teams, like good athletes, don't just practise their skills physically; they practise them mentally. Before a complex operation, good theatre teams walk through it in their minds, visualising each step, anticipating possible complications and rehearsing what they will do if they arise. That rehearsal makes the real performance smoother and more automatic.

When you're facing a high-pressure situation, take some time to picture yourself navigating it well. Imagine yourself staying calm, thinking clearly and communicating effectively. Mental rehearsal of this kind can improve your performance when the pressure is on.

Practical takeaways for leaders

1. Master your breath: The next time you feel yourself getting stressed, take a moment to focus on your breath. Try box breathing. Notice the effect it has on your physical and mental state. Make it your go-to tool for managing pressure in the moment.
2. Build a mindfulness practice: Start with just five minutes a day. Find a quiet place to sit, close your eyes and focus on your breath. When your mind wanders, gently bring it back. A guided meditation app can help if you'd like some support.
3. Rehearse for success: Before your next important meeting or presentation, take some time to picture yourself at your best. Walk through the scenario in your mind, imagining a good outcome. This builds confidence and improves your actual performance.

Pressure is an inevitable part of leadership. You can't always control your circumstances, but you can control your response. By understanding what pressure does to the brain and practising these simple techniques, you can learn to stay calm, think clearly and lead well, whatever you face.

Dr Hercules Kollias is a medical doctor and surgical assistant in Brisbane. He studied neuroscience and psychology and has spent over 20 years coaching leaders, teams and doctors.