視覚探索における有効視野特性の反応時間と眼球運動による検討

抄録

The purpose of this study was to investigate the properties of functional visual fields in visual search processing. Subject's task was to search a target among distractors while EOG was recorded. The target was defined by the difference of the orientation of line segments. The eccentricity of the target was an independent variable and RT and the number of saccades during the stimulus presentation were dependent variables. Although the mean RT and the number of saccades increased as a function of the eccentricity, the increment of RT was not linear. The area in which subjects could find a target within one saccade corresponded the changing point of increment of the RT function. The area was thought as the preattentive sampling areas for the goal of a saccade. The RT increased as a function of eccentricity even when no saccade was observed. The results were discussed in terms of the recent theory of visual search and visual attention.