Speaker Name(s): Melvyn A. Goodale, Ph.D., F.R.S.C.
Description: The idea of two visual systems in a single brain might seem initially counter-intuitive. Our visual experience of the world is so compelling that it is hard to believe that some other quite independent visual signal – one that we are unaware of – is guiding our movements. After all, it seems obvious that it is the same subjective image that allows us both to recognize the coffee cup on our desk and to pick it up. But this belief is an illusion. As work with neurological patients shows us (and this has been confirmed in recent brain imaging studies), the visual signals that give us our experience of the cup are not the same ones that guide our hand as we pick up it up!