The term "functional fovea1" was suggested as a nomination of the mechanism of perception of stabilized pictures. It is supposed that by means of specific coordination of the eye's muscles particular parts of the stabilized stimulus occur in the center of attention and are thus separated by the observer as particular fragments of the whole picture. At that the size of fragments is accepted as the measure of the functional field of foveal perception. The fragments are minimal in the recognition task and they become larger in identification and in observing recognized pictures. Also fragments of rounded figures are lesser as compared with fragments of angled figures. In all kinds of tasks fragments become larger when the observed pictures are larger. However the size of fragments has an upper limit and is independent of the type of task and of the structural features of the picture.