THE DIRECTION OF THE PERCEPTUAL DISPLACEMENT OF A MOVING TARGET’S STARTING POINT: THE FRÖHLICH EFFECT, THE BACKWARD MISLOCATION AND THE VELOCITY OF MOTION.

  • Alessia Bastianelli
  • Rossana Actis-Grosso
  • Natale Stucchi

Abstract

The aim of the research presented here was to test the role of velocity on the perceptual displacement of the starting point of target moving on horizontal and vertical trajectories. In this work we summarize the results collected in our previous work together with a new experiment. The results of four experiments are presented, in which the velocity of a moving target was modulated (experiment 1 and 2) and two different absolute velocities were tested (experiment 3 and 4). Pooling together all the results helps to understand the nature of the effect, which has a direction opposite to the direction of motion (i.e. backward mislocation) with slow velocity whereas with higher velocities the first part of the trajectory is deleted (i.e. Fröhlich effect). Results are discussed in light of the motion extrapolation theory, suggesting a possible mechanism for dislocations of starting point.

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