Abstract
Our visual system can associate parts of a figure into a perceptual whole if a minimal feature contrast of the figure against the background is present, and if certain rules of Gestalt properties are fulfilled. It is, for example, easy for us to recognize the triangles in figure 1 even though they are presented only as parts. Such type of feature association does not require previous knowledge of the figure. The association from its parts is a pre-attentively (“bottom-up”) acting process. In contrast, the Dalmatine dog in figure 2 can only be discovered quickly and easily if one is already familiar with the picture. Here, the difficulty of preattentive feature association is due to the complexity of the figure, and its discovery is made even more difficult by the similarity of the features of dog and background. Feature association and recognition, in this case, requires visual memory or other “top-down” support.
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Eckhorn, R. (1994). Oscillatory and Non-Oscillatory Synchronizations in the Visual Cortex of Cat and Monkey. In: Pantev, C., Elbert, T., Lütkenhöner, B. (eds) Oscillatory Event-Related Brain Dynamics. NATO ASI Series, vol 271. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1307-4_10
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