The Neural system of category-specific effects

In this experiment, the effect of object category was assessed using behavioral reaction time and event related potentials, while subject performed categorization task with words referring to objects from natural (e.g. animal) and artefactual (e.g. tool) categories. Results revealed significantly greater RTs and more negative N400 component for tool words rather than animals. Different spatial distribution of N400 component for tool and animal categories as well as results of behavioral data is consistent with categorization of knowledge.