An ERP Study On Hemispheric Lateralization And Interhemispheric Integration Of Lexical Process

Using ERPs , we examined the difference between words and pseudowords, animal words and tool words, as well as the different visual fields effects on the word categories when subjects did lexical decision task on tachistoscopic visual half-field stimulus presentation. The behavior data showed that the RT of words was faster than pseudowords, the correct rate was higher; the RT of animal words was faster than tool words. In the condition of bilateral visual field, the RT was faster than left and right visual field. The ERP results showed that: on the P2 component the ERP activated by pseudowords were more positive than words, the ERP activated by animal words were more positive than tool words in frontal area; the N300 component has the bilateral gains, the right electrode were more negative than left. The pseudowords and words have a different wave around 400ms, on frontal area and parietal area, the midline electrodes were more negative than two sides. Our results partly support neurobiological theory of the language representation.