Testing the right hemisphere requires nonverbal methods. For example, a picture of a key is projected to the right hemisphere (via left visual field) and the participant is asked to touch different objects that they cannot see until they hold up the correct one. This task could be performed correctly by the left hand (controlled by hemisphere) but not by the right hand (controlled by left hemisphere). In this case, the left hemisphere doesn't know what the left hand is doing. This shows how in most people, the right hemisphere is responsible for processing spatial information, face preception, processing emotional aspects of language, and controlling attention.