A toddler scoops up mud, loving the way it squishes between his fingers. As he brings the wet, cool clump to his lips his caretaker warns, “No! That’s gross!” He puts it in his mouth anyway and a moment later his face wrinkles, he starts crying and spitting out the dirt.

Humans learn through this same basic process throughout life -- not by being told, but by doing. We’re hardwired to learn by interacting with the world around us and then perceiving the results. Neuroscientists call this simple yet powerful system the perception-action cycle.

What is the Perception-Action Cycle?

Neuroscientists describe human learning through the perception-action cycle.

Our brain makes sense of the world around us by creating and testing hypotheses about the way the world works.

When presented with new situations, our brain makes predictions based on past experiences, takes action based on those hypotheses, perceives the results and adjusts its hypotheses.

All goal directed behavior is performed within the broad context of the perception-action cycle, which is grounded on a basic biological principle: the circular cybernetic flow of cognitive information that links the organism to its environment. — Joaquín M. Fuster, Physiology of Executive Functions: The Perception-Action Cycle

In general, the posterior brain areas handle sensory perception such as seeing and hearing, while the more frontal brain regions are in charge of motor skills, planning and decision-making. The front and back of the brain work together, with information flowing between them.



Before we make a decision or take action, the prefrontal cortex is involved in considering both the information it is receiving from the back of the brain (perceptions), as well as stored memories or experiences that relate to it. The prefrontal cortex helps make a prediction of what will happen and initiates the appropriate body movement.



As the brain perceives the result of the action made by the body, it either reinforces the brain’s existing neural networks of understanding about how the world works, or begins to create new ones.



The perception-action cycle is this continuous flow of information and action between the brain and the world around it. On and on it goes: sense, predict, act, adjust. Sense, predict, act, adjust.

The perception-action cycle is a feedback loop helping us build an understanding of how the world works.

For example, if you see a cup, you know what it is and what to do with it, even if you’ve never seen that exact cup before. And you don’t even have to think about it, because your brain has already built circuitry dedicated to its understanding of cups.

In fact, you have a rich network of understanding, what Piaget called schemas, about cups. Your brain also has associated movements connected to those schemas — you automatically reach for a coffee mug differently than a wine glass. And you don’t have to think about that, either.

Knowledge like this that gets encoded in our brain through the perception-action cycle is extremely powerful and easy to retrieve. And that’s what makes the perception-action cycle so valuable: it is the natural, automatic way we make sense of the world around us, and decide how to live in that world.