Asymmetry in the spatial position of vertical and horizontal lines in the visual field using a temporal segregation task

Visual perception is not uniform across the visual field, and performance exhibits heterogeneity with spatial location. Such asymmetry has been observed in several tasks, including those mediated by contrast sensitivity, but it has been reported that vertical lines can be detected with constant performance regardless of spatial location. In this study, we investigated the asymmetry of vertical and horizontal lines in space using a temporal segregation task. As a result, horizontal lines showed asymmetry in space, but vertical lines showed no asymmetry. This suggests that exogenous or endogenous attention cannot attenuate asymmetry, but that asymmetry may not occur when information extraction is completed quickly.