The Constant Spread Of Feature-Based Attention

Previous studies have shown that attention to a particular stimulus feature can produce feature-specific modulation in a different location,enhancing neuronal responses to unattended stimuli sharing that feature,which is the Feature-based Attention.Although the spread of feature-based attention is presumed to be constant across spatial locations,it has not been tested empirically in tilt illusion.We have measured the magnitude of motion aftereffect and tilt illusion in different spatial locations by presenting the adaptive and test stimulus separately at a plurality of eccentricity positions.In experiment 1,there is no significant difference in the magnitude of aftereffect in different eccentricity positions.The results of experiment 2 and 3 show that the cortical magnification factor(CMF)has an important influence on the visual acuity of human subjects.More importantly,after excluding the influence of CMF factors,there is no significant difference in the size of tilt illusion in different visual spatial positions.These results demonstrate that feature-based attention is not only a global effect,but also spread completely across the visual field.