The brain needs to have a story; it needs to have a logical screenplay telling where we're coming from and what we're going to.

With its billions of interconnected neurons, whose interactions change from millisecond to millisecond, the human brain is an archetypal complex system.

Eventually, brain implants will become as common as heart implants. I have no doubt about that.

There are several patients - there are thousands of patients, tens of thousands of patients, that carry either a stimulator in the brain or in the periphery, in the inner ear, to restore neurological functions or to control diseases like Parkinson's disease.

In my view, while the single neuron is the basic anatomical and information processing-signaling unit of the brain, it is not capable of generating behaviors and, ultimately, thinking. Instead, the true functional unit of the central nervous system is a population of neurons, or neural ensembles or cell assemblies.

It's the first time an exoskeleton has been controlled by brain activity and offered feedback to the patients. Doing a demonstration in a stadium is something very much outside our routine in robotics. It's never been done before.