Electrical potentials of the brain associated with categorization of labels of animate and inanimate objects

We studed priming effect in the categorization of animate and inanimate kinds. Fifty subjects performed a categorization task within the context of the priming effect; each trial consisted of a prime-word and a target-word, and subjects had to decide as fast and as accurately as possible whether or not target-word belongs or to the category, denoted by the prime-word. Such indicators as reaction time, accuracy, Event Related Potentials (ERPs) were recorded while subjects performed the task, and at the end of the study subjects provided self-reports. Subjects responded more quickly and more accurately to related targets than to unrelated ones (p=0,00), and the same condition is evaluated by them as a simpler condition. It is shown that the amplitude of the N400 is attenuated when the target corresponds to the prime-word by the meaning, and the amplitude of LPC is enhanced. The ERP pattern was different for animate and inanimate categories. ERP priming effect was greater for animate categories. Priming effect as a difference of indicators between positive and negative conditions was more evident for animate categories than for inanimate ones.

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