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How The Cortex Builds a Sensorimotor Model of The World

Cosyne 2015: How The Cortex Builds a Sensorimotor Model of The World

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This poster, Maintaining Stable Perception During Active Exploration, answers the question: how can the cortex build a sensorimotor model of the world? Knowing that we learn the structure of the world from sensorimotor sequences through active exploration, how can we build and test a detailed biological model?

First, we proposed a biologically detailed model of sensorimotor inference. We know the cortex receives a copy of motor commands. We also know that most sensory changes are rapid and due to our own behavior yet our perception of the world is amazingly stable. We built a model with a basic premise that predictable transitions lead to invariant representations. This comprises two parts: 1) We learn a predictive model of sensorimotor changes and 2) We learn stable representations of predicted changes.

We tested the model on a robotic testbed where we measured neuron activations over time as a small robot explored multiple worlds. At the beginning, neuron activations change rapidly due to movement. After learning, the same set of neurons remains active in a world despite movement.