ABSTRACT: A bright area on a dark ground will take on an enhanced brightness immediately next to the ground. This is known as border enhancement. Another kind of border induction occurs when the luminance of the area is intermittent: for certain frequencies the enhanced region becomes relatively large and develops a textural quality. When the two kinds of border induction are compared with respect to effects of stimulus wavelength and luminance level, it is found that they do not vary in the same manner. This indicates that although the two phenomena may be of the same origin, the relationship between them is not a simple one.