Gysen V J, de Graef P, Verfaillie K, 2000, "Detection of intrasaccadic changes in stationary and moving objects" Perception 29 ECVP Abstract Supplement
Detection of intrasaccadic changes in stationary and moving objects
V J Gysen, P de Graef, K Verfaillie
Previous research with stationary objects indicated a low detection rate for intrasaccadic position changes and a high detection rate for intrasaccadic in-depth-orientation changes. However, for translating objects these results may not apply.
The stimulus used in all four experiments shows one object moving horizontally towards another stationary object. The primary aim was to clarify the influence of the object's dynamic status (stationary or moving) and the object's saccadic status (target or flanker) on detection of both types of changes. An analysis of variance on sensitivity values was performed.
Position changes were detected with a higher accuracy for moving objects. Furthermore, saccadic status played no role in detecting these changes. For the stationary object, detection was only high in saccade-target conditions. Concerning orientation changes, performance was almost equal for stationary and moving objects. For both types of objects, detection was always better for the saccade target. For detection of changes in stationary objects, it is thus very important that the object is also the saccade target. For moving objects, this is only the case for in-depth-orientation changes. Even when a moving object is not the saccade target, we can keep track of its path and detect changes in that path.