By Peter H. Lindsay
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Extra info for Human Information Processing: An Introduction to Psychology
Moreover, when the objects are arranged on a table and viewed from slightly above, the observers can also report the relative positions and depths of the objects in the scene. This last finding, the ability to perceive depth in a two-dimensional tactile image, is particularly interesting. A major clue to depth seems to be the relative height of objects at different distances. Some of the observers also noted the relationship between the image size and the distance of the object in the environment.
Compensation for eye movement does not occur unless it is produced actively. The same might be true of tactile movements. We have just started on the trail of the exploration of pattern recognition. In the next two chapters, we examine some of the problems in more detail: Both the exact neurological operations of the cells responsible for the initial processing of the signals and the status of some theories of pattern recognition will be discussed. We shall see that the extraction of features plays an important role both in the study of the physiological mechanisms and in the theoretical structures.
The most popular explanation is that perception of the pattern depends on the activity of very complex feature detectors, neural circuits that detect lines, edges, angles, and perhaps circles. So long as enough information is being provided by the neural receptors in the eyes, the complex feature detector continues to respond, and the pattern can be seen intact. When the eye stops its movements the receptors in the eye cease their responses. When there are no longer enough responses coming from the eyes to drive the complex detector, it ceases to respond and the pattern disappears as a whole.