Researchers from the University of Berkeley recently discovered how the brain proceeds when searching for something. In order to be as efficient as possible the brain calls upon brain regions which are usually in charge of other tasks and categories. As an example, when you are looking for someone (object category "People") it also involves neurons which normally respond to other categories such as animals or plants. These neurons are then temporarily assigned to the category "People". This is the brain's very high flexibility proven all over again...