How the Nervous System Shapes Our Emotional World
When we think about mental health, we often focus on thoughts, feelings or behaviours. But beneath all of that is something just as important: the nervous system. One of the most influential ideas in understanding how the nervous system affects mental health is Polyvagal Theory.
At Cova Psychology in Melbourne, many of our psychologists incorporate principles of Polyvagal Theory into therapy. This approach helps us make sense of symptoms like anxiety, dissociation or a sense of “not being fully here” or shutdown or chronic tension — not just as psychological experiences, but as the body’s automatic survival responses. Understanding how these responses work can offer powerful insights into healing and change.
What Is Polyvagal Theory?
Polyvagal Theory was developed by Dr Stephen Porges, a researcher in neuroscience and psychiatry. At its core, the theory describes how our autonomic nervous system (the system that controls things like heart rate, breathing and digestion) is constantly scanning the environment for cues of safety or danger. This process, called neuroception, happens below conscious awareness.
Depending on what the nervous system detects, it shifts into one of three main states:
A calm, socially engaged state (ventral vagal)
A fight or flight state (sympathetic)
A shutdown or frozen state (dorsal vagal)
These states are not just emotional — they shape how we connect with others, how we think, and even how we experience our own bodies.
The Three Main Nervous System States
Ventral Vagal: The State of Safety and Connection
When we feel safe, our ventral vagal system is active. This state supports calm, curiosity and connection. It allows us to think clearly, engage with others, and feel grounded. In this state, the heart rate slows, breathing is steady, and digestion works well.
In therapy, helping clients access this state can support emotional regulation and the ability to reflect on difficult experiences. It’s often the state we aim to build more access to, especially when someone has spent a long time in survival states.
Sympathetic Activation: Fight or Flight
If the nervous system senses danger, it may move into a sympathetic state — the classic fight or flight response. This state is associated with anxiety, panic, anger or restlessness. The heart rate speeds up, breathing becomes shallow, and the body prepares to respond to a perceived threat.
While this response is essential in true danger, chronic sympathetic activation can be exhausting. Many people with anxiety, trauma histories or high stress live in this state without realising it. Therapy helps to notice these patterns and develop ways of returning to safety.
Dorsal Vagal Shutdown: The Freeze Response
When danger feels overwhelming and escape seems impossible, the nervous system may shut down altogether. This dorsal vagal state can feel like numbness, disconnection, fatigue or hopelessness. For some, it shows up as dissociation or a sense of “not being fully here”.
This response is not a flaw or weakness — its the body’s last-ditch attempt to protect itself. However, when this state becomes chronic, it can affect mood, memory, relationships and physical health. Therapy helps to gently bring awareness to these experiences without pushing the system too fast.
Why Polyvagal Theory Matters in Therapy
Understanding these nervous system states changes how we approach mental health. It helps explain why some clients may find it difficult to talk, feel flat or shut down in sessions, or become flooded by emotion. These are not signs of resistance — they are nervous system responses.
By recognising the body’s role in mental health, therapy can become more compassionate and effective. For example, a psychologist might notice when a client’s breathing changes or their voice becomes quieter, and pause to check in. They may also teach grounding techniques or use body-based approaches to help shift states gently.
In trauma therapy, this is especially important. Traditional talk therapy can sometimes bypass the body, but trauma lives in the nervous system. Working with that system — rather than against it — helps clients feel safer and more in control.
Regulation, Not Relaxation
A common misunderstanding is that the goal of therapy is always to feel calm. But for someone in a collapsed or shut down state, calming down even further may not be helpful. Instead, what we aim for is regulation — the ability to move flexibly between states and come back to a place of balance.
Regulation does not mean avoiding stress altogether. It means being able to respond, recover and reconnect. Therapy informed by Polyvagal Theory supports clients in building that capacity over time.
Clues That Your Nervous System Is Involved
Many clients we see at Cova Psychology have experiences that suggest their nervous system is playing a role in their mental health. These might include:
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Feeling easily overwhelmed by daily tasks
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Trouble staying present in conversations
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Physical symptoms like tightness in the chest, nausea or chronic fatigue
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A sense of “shutting down” in stressful situations
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Feeling detached from emotions or body
These symptoms are often frustrating, especially when they seem to appear out of nowhere. Understanding them as nervous system responses — not character flaws — can bring a huge sense of relief.
Working with the Body in Therapy
Psychologists who integrate Polyvagal Theory into their work may use a range of techniques to support nervous system awareness and regulation. These can include:
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Noticing shifts in body posture, tone of voice or breath
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Using movement, breathing or grounding exercises
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Exploring relational safety in the client–therapist relationship
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Encouraging curiosity about internal states without judgement
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Helping build tolerance for uncomfortable feelings in small steps
Therapists don’t need to be bodywork practitioners to do this. Simply being aware of the nervous system and pacing the work accordingly is already powerful. At Cova Psychology, we take a gentle and collaborative approach, always guided by the client’s sense of safety.
Polyvagal Theory and Trauma
Polyvagal Theory has become especially influential in the treatment of trauma. For people who have lived through overwhelming or unsafe experiences, the nervous system may become “stuck” in protective states. This can lead to patterns of avoidance, shutdown or hypervigilance that feel difficult to change.
Therapy informed by this theory helps clients recognise that these responses made sense at the time — they were survival strategies. But now, with support, it may be possible to find new ways of responding. By respecting the pace of the nervous system and focusing on safety, therapy becomes a space for integration rather than reactivation.
Building a Window of Tolerance
One way of describing the goal of this work is expanding the “window of tolerance.” This is the range of nervous system states in which a person can function and reflect without becoming overwhelmed or disconnected. When we are within this window, we can feel emotions without being swept away, and stay present even during difficult moments.
Polyvagal-informed therapy gently stretches this window over time. It helps clients build the capacity to notice early signs of dysregulation and apply strategies to stay grounded.
Polyvagal Theory in Everyday Life
Understanding how your nervous system works can also help outside of therapy. You might begin to notice that certain environments, relationships or habits either support or challenge your regulation. For instance, spending time in nature, engaging in gentle movement or connecting with safe people can all support a ventral state.
On the other hand, doomscrolling, skipping meals or rushing from task to task may increase sympathetic arousal or contribute to shutdown. By becoming more aware of these patterns, you can make choices that support your mental health in everyday life.
We’ve also explored some of these strategies more in our post on emotional resilience and coping with stress.
A Compassionate Framework
At its heart, Polyvagal Theory invites compassion — for yourself, for others, and for the body’s attempts to protect and survive. When we understand symptoms as adaptive responses, not personal failures, the path to healing feels more accessible.
This framework doesn’t replace traditional therapy models, but it enhances them. It reminds us that insight alone isn’t always enough — the body also needs to feel safe. At Cova Psychology, our psychologists in Melbourne are deeply attuned to this balance and draw on these ideas to support meaningful and lasting change.
Ready to Begin?
If your ready to explore support, we’re here to help. Our psychologists in Melbourne offer a range of evidence-based therapies with a trauma-informed, body-aware approach. Whether you’re struggling with anxiety, ongoing stress, or nervous system dysregulation, we’ll work with you to find safety, regulation and growth.
To get started, contact us and we’ll help you find a psychologist who’s right for you. We offer both in-person sessions in Melbourne CBD and online appointments Australia-wide.
Dr. Sarah Valentine
Sarah is a Clinical Psychologist and co-director of Cova Psychology. She has worked in a range of settings in both the public and private sectors of mental health system in Melbourne over the past 20 years. Sarah is passionate about helping her clients heal trauma, is an experienced EMDR therapist and also incorporates Schema Therapy and Mentalisation Based Therapy (MBT) into her work. She is a board approved supervisor and mentor and enjoys supporting psychologists at all stages of their career.