"It turns out that messages which cause emotional disturbance impair our reasoning ability; this provides a physiological basis for the negative effects of labelling and stereotyping. Claude Steele, a professor of psychology, gave a group of his students a test that he said would measure their innate intellectual ability. White students performed better than black students. But when Steele gave a different group the same test, but stressed that it was a meaningless practice exam, the scores of white and black students were virtually identical. Similarly, women will do less well in a maths test if they are told it measures “cognitive differences between the genders.”"
The basic premise on which Gestalt therapy rests is that of holism (Perls, 1973). The greatest value in the Gestalt approach, according to Perls, Hefferline and Goodman (1951, p.19):
. . . lies in the insight that the whole determines the parts, which contrasts with the previous assumption that the whole is merely the total sum of its elements.