Motor Decision: Not a Command, the Prereflexive Act You Have 280 Milliseconds to Read

Motor decision is the act by which the nervous system chooses, in the 100 to 300 milliseconds preceding a gesture, the postural and motor strategy best adapted to the available sensory context.

It is made upstream of the muscle, based on the integration of the five hierarchical sensors, learned motor patterns, and the contextual threat assessment.

In the LabO RNP grid, reading the motor decision before it produces the gesture is the primary act.

Reprogramming the decision rather than correcting the gesture is the secondary act.

Why Motor Decision is Central to Neuro-Postural Reprogramming

A sprint support lasts one hundred milliseconds. Proprioceptive feedback takes between one hundred and two hundred milliseconds to reach the brain (Shadmehr 2010). The calculation is simple: at the moment your athlete places their foot on the ground, their brain does not yet know it has been placed. The movement is not commanded in real-time. It is predicted, within a window of one hundred to three hundred milliseconds before the gesture. It is this pre-reflexive prediction that LabO RNP calls the motor decision.

The readiness potential that Libet measured as early as 1983 confirms this at another level: it precedes the awareness of having chosen by several hundred milliseconds. The nervous system decides. Consciousness observes.

Imagine now a physical trainer alone in front of videos of an athlete who plateaued without an identifiable biomechanical cause. He pauses the image at 280 milliseconds before the impulse. He advances frame by frame. A pelvic tilt appears where the untrained eye sees normal. The motor decision is inscribed there, in the window that no one taught him to look at. It is this moment, and this moment alone, that is the working ground of Neuro-Postural Reprogramming.

As long as we correct the gesture, we correct the output. As long as we haven't touched the decision, we shift the compromise without resolving it. Eighty percent of the intervention result is played out in reading the decision, not in the precision of the resulting gesture.

How to Read the Motor Decision in the Field (Monday Morning)

Reading the motor decision is not seeing the gesture. It's seeing what happens just before.

Concretely, you observe the 200 to 300 ms window preceding the gesture. The micro-pelvic tilts, the scapular pre-positioning, the ocular orientation anticipating the target, the paravertebral tone changing before support. The motor decision is already inscribed there, readable to the trained eye, even more precise in frame-by-frame video. You train yourself to see what was there all along.

You can read it live, laterally, by following the gaze orientation and pre-tension of the tone. You can read it in frame-by-frame video for high-level or complex cases, exactly as Romain did with his jumper. You can deduce it through postural tests that force the system to reveal itself: a single-leg support with closed eyes, a mandibular rotation, a podal wedge tilt, and you see which strategy the system chooses to compensate.

For a physiotherapist facing recurrent low back pain, the motor decision to read is almost always a protective strategy that the system chose long ago, and which no longer has a reason to be. The contextual threat has been lifted. The decision still holds. The gesture corrected six times returns because the decision itself has never been touched.

For a physical trainer facing an athlete who plateaus without an identifiable biomechanical cause, the motor decision to read is this fixed strategy that pre-organizes each support, each tilt, each weight transfer in a geometry that limits the result. This is the pivotal Coaching case: “From a biomechanical point of view, nothing was happening.”

For a psychomotor therapist facing a child who cannot read, the motor decision to read is disrupted by residual primitive reflexes (palmar, ATNR, STNR) that permeate primary motor skills and prevent oculo-manual integration. Reintegration of the reflex frees the decision upstream of the reading gesture.

One single reading grid. Three territories.

What We Hear (and What Is Hard to Hear)

We hear that the brain controls movement in real-time. The numbers make this idea untenable: the conduction delays of proprioceptive feedback are one hundred to two hundred milliseconds (Shadmehr 2010), and a sprint step lasts one hundred milliseconds. The feedback doesn't arrive in time. The motor decision is not a command. It is a proprioceptive prediction that spinal reflexes execute by minimizing the prediction error (Friston 2011).

We hear that the motor decision is too subtle, too fast, invisible. It is under-observed, which is not the same thing. A trained eye reads the decision in the 200-300 ms window. It is a professional skill that is acquired, not a gift.

We hear, above all, that the motor decision is a matter of motivation or concentration. Not motivation. Not commitment. Not lack of effort. The absence of reading. The decision is prereflective. It is made before any voluntary effort. Working on the motivation of an athlete whose motor decision is fixed is like adjusting the volume on a radio that is tuned to the wrong frequency.

Finally, we hear that talking about the "decision" of the nervous system is anthropomorphism. The term is an operational metaphor for the movement professional, not a computational thesis on conscious cognition.

What matters on the field is that there is a moment, measurable and readable, where the system chooses a strategy among N possible ones. It is this moment that we learn to read, without having to settle the Friston-Gibson-Dennett debate in the philosophy of mind.

To Go Further (Scientific References)

The motor decision has been a continuous subject of study for a century, in fields that did not communicate with each other.

Sherrington established in 1906 the reflex loop and the concept of the sensorimotor circuit where the gesture is an output, not a cause. Bernstein formalized in 1967, in Dexterity and Its Development, the problem of degrees of freedom: the nervous system must choose an organization among N possible ones for each movement. It is the direct conceptual ancestor of the motor decision.

Libet, in 1983, measured the readiness potential that precedes the awareness of having chosen by 350 to 500 milliseconds. The decision is prereflective, demonstrated experimentally. Shadmehr established in 2010 the conduction delays of proprioceptive feedback (100-200 ms) that make continuous flow control impossible on ballistic movements. Friston formalized in 2011, in Neuron, active inference: the motor decision is a proprioceptive prediction that minimizes error. Damasio, between 1994 and 2018, reintegrated emotional and somatic evaluation in bodily decision-making.

LabO RNP does not add a new scientific thesis to this lineage. It adds the operational framework that makes the motor decision readable and reprogrammable by Monday morning.