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Visual discrimination task. Subjects viewed single visual stimulus at a near-threshold presentation time on the display of an AV tachistoscope (Iwatsu IS701A). The task was to distinguish the target stimulus from non-target stimulus and to press a button with the right index finger when the target stimulus was presented on the centre of the display. Target stimuli were selected from digits and non-target stimuli were selected from 40 kinds of Japanese phonogram (hiragana).
