Random point cinematogram
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A random dot-Kinematrogramm (engl. Random-dot kinematogram , RDK) is an experimental tool in cognitive psychology to study the motion perception . Randomly arranged points are displayed in an image sequence . In addition, a direction of movement and a step size of this movement are defined for each such kinematogram, which is uniform for the entire sequence. In each individual image, a certain number of points is selected at random, the position of which changes in this way in the subsequent image. These are the so-called " signal dots ". The other points, the " noise dots ", on the other hand, are arranged randomly in the next individual image.
The advantage of this method is that the strength of the presented stimulus can be changed by changing the signal-to-noise ratio, which is referred to as coherence. A decisive aspect is that the direction of movement cannot be recognized by following a single point, but that a holistic movement perception must take place.