INDIVIDUAL DIFFERENCES IN STARTING POINT LOCALIZATION OF MOVING OBJECTS: DATA ANALYSIS USING MULTILEVEL/HIERARCHICAL MODELS.
When observers are asked to localize the starting point (SP) of a moving target, the perceived position is reported both in and opposite to the direction of motion. It is still not clear under which conditions the perceived SP is mislocalized back or forth. Although research has shown a remarkable inter-individual variability, only few studies mentioned this aspect, which seems to be crucial to understanding whether the observers used different evaluating systems on judging the SP or it is due to methodological aspects. In the present study, we used multilevel models to choose between these two alternatives analyzing individual variability in localizing SP as a function of both velocity and direction. Results showed an individual variability, suggesting that observers used different evaluating systems when asked to localize the SP of a moving target.