People often come to therapy feeling frustrated with themselves. 'I know it's irrational,' they say. 'I know logically that everything is fine. But I can't stop worrying.' And then they feel guilty for not being able to think their way out of it.
If you've ever felt this way, here's something worth knowing: your brain isn't broken. It's doing exactly what it evolved to do. The problem is that the brain evolved for a world where threats were mostly physical, mostly short-lived, and mostly resolved by fighting or running. Our modern world — full of uncertainty, chronic pressure, and an endless feed of potential threats — breaks that system. The alarm stays on.
The Two-System Brain
Neuroscientists often describe anxiety through the lens of two interacting systems. The amygdala — a small, almond-shaped structure deep in the brain — acts as your threat-detection centre. It processes incoming information at lightning speed, before your conscious mind has had a chance to evaluate it. When it detects danger, it fires stress hormones — cortisol and adrenaline — and readies the body for action.
The prefrontal cortex is the thinking, reasoning part of the brain. It can evaluate whether a threat is real, put things in perspective, and regulate emotional responses. Under normal conditions, the prefrontal cortex acts as a check on the amygdala. But here's the problem: under high stress, the amygdala effectively takes the prefrontal cortex offline. Threat circuitry overrides reasoning. This is why, when you're very anxious, logic doesn't help — the part of your brain that processes logic is not fully available.
You can't think your way out of an activated nervous system. But you can work with your body to shift it.
What This Means for Treatment
Understanding this has significant implications for how we approach anxiety. Purely cognitive strategies — challenging thoughts, listing evidence for and against — have limited effectiveness when the nervous system is highly activated. This is one reason ACT works differently. Rather than trying to change anxious thoughts through logic, ACT focuses on changing your relationship with thoughts. Defusion techniques help you observe thoughts without being consumed by them. Values-based action helps you move forward even when anxiety is present.
Physiological tools matter too. Slow, diaphragmatic breathing activates the parasympathetic nervous system — the body's rest-and-digest counterpart to the fight-or-flight response. Progressive muscle relaxation, cold water on the face, and grounding exercises are not 'soft' interventions. They are direct inputs to the nervous system. They work because they speak the body's language.
The Role of Interoception
Emerging research has drawn increasing attention to interoception — our ability to sense and interpret signals from inside the body. People with anxiety often have difficulty distinguishing between emotional and physical sensations, leading to catastrophic interpretations of normal bodily experiences (heart rate, tightness, nausea). Building interoceptive awareness — learning to be curious about body sensations rather than alarmed by them — is a growing area of clinical practice that shows significant promise.
If anxiety is getting in the way of your daily life, the team at Melbourne Wellbeing Group offers evidence-based psychological treatment tailored to you. Understanding how anxiety works is the first step to changing it.