THE EFFECT OF PERCEPTUAL LOAD ON DIRECTION JUDGMENT TASK
 
Muroi, M., Okabe, Y. and Saito, M., Nihon University, Japan
 
In recent studies, it is shown that perceptual load has an effect on how information is selected by attention (Lavie, 2001). If we need to look at much information, we exhausted our resource to process it, and then the effect from other information, which is irrelevant to the task, reduces because there is no resource to process it. In most of those basic studies, simple and meaningless materials, such as letters, were used, and participants are asked to chose one of two responses as soon as possible depending of which letter is presented. In this study, we investigated the effect of perceptual load with materials which seems to be more meaningful in daily life in direction judgment task which is combined with Go/No-Go task. Participants were asked to judge a direction of arrow, which is right or left, and push a computer key depending on which arrow was presented. However, participants had to withhold their response when the No-Go signal was presented in each trial. Go or No-Go was judged depending on a single stimulus when the perceptual load was low, and on a combination of two stimuli when the perceptual load was high. As a result, perceptual load had an effect on processing the irrelevant stimulus as in the previous basic studies.