PS_1.010 - Dissociation between perception and action in pseudoneglect

Massen, C. ¹ , Rieger, M. . ² & Sülzenbrück, S. . ¹

1 Leibniz Research Centre for Working Environment and Human Factors
2 Frankfurt University

An important question in visual cognition is whether processing visual input for perceptual judgment differs in a fundamental way from processing visual input to guide one’s actions. Many studies, e.g. on visual illusions, have supported this view, but have typically focused on simple action requirements like grasping for an object. In this study, we investigated dissociations between perception and action using more complex tool-use actions. In a line bisection task, participants had to either mark the centre of a line with a pencil or cut the line in two halves using a pair of scissors. Results indicated the typical leftward bias (pseudoneglect) in the pencil task, but no such bias in the scissors task. These results indicate that the distinctiveness of processing visual input for action can be demonstrated in tasks other than grasping and support the notion of functional differences between vision for perception and vision for action.