A field notebook exploring nervous systems, horses, and the biology of safety.
What happens in the nervous system when a horse and a human share the same space — and what does that tell us about how safety is built?
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These notes sit at the intersection of peer-reviewed research and direct paddock observation. Each entry begins with a question that emerged from clinical work or time spent with horses, then traces that question back through the science — neurobiology, attachment theory, polyvagal research, and animal behavior. The goal is not to simplify the science, but to make it visible in a context where it can be observed in real time
Why this exists
Nervous system science can be difficult to hold onto in the abstract. The concepts are real — co-regulation, neuroception, the window of tolerance — but they become slippery when they live only on a page. What I have found, over years of clinical work and time spent with horses, is that the paddock makes these concepts visible. A horse does not perform calm. It either is calm or it is not, and the reasons why are often legible if you know what to look for. These notes exist because I kept finding that the clearest explanations of nervous system science were the ones that happened outside, between species, in real time.
Melissa Jean Jarzynski is a trauma-informed physical therapist and board-certified Hippotherapy Clinical Specialist with more than two decades of clinical practice. Her work sits at the intersection of physical therapy, equine behavior, and nervous system science — exploring how fear, pressure, and safety move between living beings, and how those dynamics shape trust, healing, and connection.
Horses occupy a particular place in this work. As prey animals with highly attuned nervous systems, they respond visibly and honestly to changes in tension, breath, and emotional state. Melissa has spent years observing these responses in clinical and paddock settings, using them as a lens for understanding co-regulation, neuroception, and the conditions under which safety becomes possible.
She is a co-founder of the Stable Friendships Foundation, a nonprofit dedicated to connecting children and adults with the therapeutic benefits of partnering with horses, and is currently writing Finding Peace in the Paddock.