The temporal characteristics of the motion bridging effect and a connected illusion: Time-related interactions and dependencies in a two-process-model

by Lotta Ottensmeyer
Doctoral thesis
Date of Examination:2024-05-28
Date of issue:2025-05-22
Advisor:Prof. Dr. Uwe Mattler
Referee:Prof. Dr. Uwe Mattler
Referee:Prof. Dr. Stefan Treue
Persistent Address: http://dx.doi.org/10.53846/goediss-11286

 

 

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Abstract

English

The Motion Bridging Effect (MBE) is a visual illusion in which a motion that is not consciously visible, due to high speed, induces an illusory rotation percept in a stationary stimulus (test ring) that is presented before or after the inducing stimulus (inducing ring). This illusionary rotation usually has the same direction as the invisible rotation of the inducing ring. Based on investigations on a related illusion, called the Ring Rotation Illusion (RRI), in which a similar motion illusion is set off through the stationary outline of a circle instead of a rotating inducer, the Two-Process-Model of the MBE was developed. In this model, the first process of the MBE could be characterized as some form of an apparent motion or a visual heuristic, that works at the transition of inducing and test stimulus and could be responsible for the RRI as well. The second process gathers the direction signal from the fast rotation of the inducing stimulus and biases the direction of the illusory motion created by the first process. In the three studies of this dissertation, a method to objectively measure the duration of the illusionary motion percept was established. The Two-ProcessModel could be supported through comparison of temporal dependencies of this duration and the perceived clarity of both illusions with the observable direction congruency of the MBE. Also, the temporal features of the emergence of the MBE were revealed. Those take the form of a constant temporal window for the perception of the illusion and an optimal minimal temporal interval for the transfer of the directional signal from the inducing to the test ring.
Keywords: Visual Illusion; Motion Perception; Motion Bridging Effect
 
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