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The visual attention mechanism in the brain was studied among16young subjects through the precue-target visual search paradigm using the event-related potentials(ERPs)technique,with the attentive ranges cued with different scales of Chinese words.The results showed that the response time was shortened as the cue scale was reduced,while the amplitudes of the P1and N1components of the ERPs increased.These results not only provided the electrophysiological evidence supporting the spotlight theory,but also indicated that the spotlight effect occurred during the early period of the selected attention.Two kinds of separation in the P2effect were observed.One separation was between the P1effect and P2effect,which meant that additional computation was needed when the spatial scale of attention was enlarged;the other was between the left and right hemisphere of the P2effect,which indicates that the at-tentive processing of the cue range mainly occurred in the left hemisphere.
The visual attention mechanism in the brain was studied among 16young subjects through the precue-target visual search paradigm using the event-related potentials (ERPs) technique, with the attentive ranges cued with different scales of Chinese words. The results showed that the response time was shortened as the cue scale was reduced, while the amplitudes of the P1and N1components of the ERPs increased .sese not only provided the electrophysiological evidence supporting the spotlight theory, but also that the spotlight effect occurred during the early period of the selected attention. Both kinds of separation in the P2effect were observed. One separation between between P1effect and P2effect, which meant that additional computation was needed when the spatial scale of attention was enlarged; the other was between the left and right hemisphere of the P2effect, which indicates that the at-tentive processing of the cue range include occurred in the left hemisphere.