Modern techniques for revealing where and when different parts of the brain become active have recently provided a window on the processes of attention. For example, one of these brain-scanning techniques, functional magnetic resonance imaging (fMRI), has been used to show the behaviour of an area of the brain that responds to speech. It turns out also to become activated in a person viewing lips making speech movements in the absence of sound. For this to happen there must be connections between relevant parts of the visual and auditory areas.
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