The purpose of this study is to investigate the effects of the figural unity (separation) and area of non-annular test figure (TF) on the brightness contrast in Koffka (Benussi) ring-type patterns. We used variations of the TF based on four stimulus conditions: two styles of separation, three orientations of separation, three degrees of separation, and three varieties of brightness. Five subjects were assigned to estimate the apparent brightness of the two TF sections overlapping a black-and-white inducing figure attached to a gray stimulus card. The results revealed that the magnitudes of brightness contrast (MBCs) increased linearly as the degree of separation in the TF increased; furthermore, the change of the TF area had no significant effect on the MBCs. As a consequence, the "neutralization by flow and fusion", which may decrease the brightness contrast in Koffka ring-type patterns, tends to increase proportionally as the joining part of the non-annular TF increases or, contrarily as the degree of separation decreases.