Temporal Judgments and Spatial Context
An individual tends to experience the Kappa effect when observing a sequence of stimuli in which the temporal separation (duration) between each stimulus is constant, but the spatial separation (distance) between each of the stimuli varies. As a result, the observer tends to base their judgments of the temporal separation between each stimulus on the spatial separation between each of these stimuli. Correspondingly, the Kappa effect is a temporal illusion that causes the observer to increase/decrease their judgments of temporal separation between stimuli as the spatial separation between these stimuli increases/decreases, even though the temporal separation between the stimuli stays constant. Studies often observe the kappa effect by using visual modality. For example, suppose three light sources, X, Y, and Z, are flashed successively in the dark with equal time intervals between each of the flashes. If the light sources are placed at different positions, with X and Y closer together than Y and Z, the kappa effect is created. This is because the time interval between the X and Y lights is perceived to be shorter than that between the Y and Z since the distance between X and Y is shorter In contrast, the tau effect occurs when the spatial separation between stimuli is constant and the temporal separation is varied, resulting in the observer increasing/decreasing their judgment of spatial separation as temporal separation increases/decreases. For example, when the same light sources X, Y, and Z are flashed successively in the dark with a shorter time interval between X and Y than between Y and Z, the tau effect is created that X and Y are closer together in space than is Y and Z.
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