The lute string
There is an old story about the Buddha and a monk named Sona. Before ordaining, Sona had been a renowned musician, a master of the lute.
As a monk, Sona practised with punishing effort. He walked in walking meditation until his feet bled, pushing himself to the absolute limit. And still he found no peace. Exhausted and discouraged, he thought of giving up.
The Buddha came to him and asked what happened when a lute string was strung too tight. It would snap, Sona said, and the sound would be harsh. And too loose? Then it would not sound at all. So how did you make music? The string had to be tuned — neither too tight nor too loose.
The same is true of the mind, the Buddha told him. Too much effort brings agitation; too little brings torpor. The tuning is the practice.
Centuries later, physiology would describe what that string actually is.
The Polyvagal Theory
In the 1990s Stephen Porges proposed the Polyvagal Theory, a model of the autonomic nervous system. It describes how brain and body continuously and unconsciously read the environment for safety or danger — a process he called neuroception.
The older picture had two settings: an accelerator (stress) and a brake (calm). Porges argued for three distinct physiological states instead. And in those three states, Sona's string is recognisable.
Source: Porges, S. W. (1995). Psychophysiology. DOI: 10.1111/j.1469-8986.1995.tb01213.x
Too tight — the sympathetic state
When the nervous system detects danger, it mobilises. This is fight-or-flight: adrenaline and cortisol, a fast heart, tight muscles, shallow and rapid breath. The body is preparing to survive something immediate.
This is the string wound too tight. Stuck here — as often happens with sensory overload — everything feels urgent. Anxiety, hyper-vigilance, irritability, panic. So much tension that the string feels ready to snap.
Too loose — the dorsal vagal state
When the threat is overwhelming and neither fighting nor fleeing is possible, the system reaches for its oldest mechanism: shutdown.
This is freeze, collapse, dissociation. Heart rate drops, energy drains, the body powers down to numb what it cannot escape.
This is the string hanging slack. Stuck here, you feel numb, flattened, exhausted, invisible. You may drift out of contact or lose speech. There is no energy to connect and none to move. Without tension, the string cannot sound at all.
The middle way — the ventral vagal state
There is a third state, tied to the newer branch of the vagus nerve. When the system reads safety, it settles into what Porges calls safe and social.
The heart finds a steady rhythm. The breath is even. The muscles of the face and throat release, which is what makes eye contact, tone of voice and connection possible.
This is the string in tune. Not without tension — you are awake, alert, able to act — but without strain. Grounded, centred, available for play and presence. This is the biological floor of the practice: open awareness is not available to a body that is fighting for survival.
Why this matters for neurodivergent minds
For autistic and ADHD nervous systems the world is often dysregulating by default. The sensory environment is too much (too tight). Social expectation is confusing or demanding (too tight). The exhaustion that follows becomes burnout (too loose).
Many neurodivergent people spend their lives swinging between the two — anxiety, meltdown and hyper-vigilance at one end; shutdown, burnout and dissociation at the other.
We are told to relax, or to try harder. But you cannot think your way into the ventral state. You cannot tune the string with logic.
This is why the practice starts in the body. The soft gaze widening peripheral vision, the long exhale reaching the vagus nerve — these send signals of safety to the brainstem in a language the brainstem reads. We tune the string by hand.
The practice is not forcing the mind quiet. It is the patient art of noticing when the string is too tight or too loose, and using breath, body and the space around you to bring it back into tune.