An outline of Biederman's recognition-by-components theory. Adapted from Biederman (1987).

(1984). When one of the faces is seen, the concavities help the identification of the forehead, nose, lips, and chin. In contrast, when the goblet is seen, the concavities serve to define its base, stem, and bowl.

Second, it is possible to calculate the lengths and arrangement of axes of most visual objects regardless of the viewing angle. Third, information about axes can help object recognition. As Humphreys and Bruce (1989) pointed out, humans can be readily distinguished from gorillas on the basis of the relative lengths of the axes of the segments or cones corresponding to arms and legs: our legs are longer than our arms, whereas the opposite is true of gorillas.

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