Information volume in recognizing the Japanese cursive syllabary “HIRAGANA”

Information volume, evoked potentials and reaction time with voice were studied for reading Japanese cursive syllabary “HIRAGANAs”. Thirty-two EEGs with a filter from DC to 100 Hz were sampled at 2 kHz into 24 bits during 1000 ms after displaying HIRAGANAs. Evoked potentials were marked over the frontal and occipital areas, because of referring to scalp central areas, then the potentials were converted with the current source derivation. Reaction times for voice were 623±137 for one HIRAGANA, 819±136 for two HIRAGANAs, 993±169 ms for four HIRAGANAs. Broad central areas showed graded different potentials between reading silently and aloud, corresponding to the volume of the information, after 100 ms before 500 ms displaying HIRAGANAs.