The Diagnostic Drawing Series and the Tree Rating Scale: An Isomorphic Representation of Multiple Personality Disorder, Major Depression, and Schizophrenia Populations

This pilot study used the Diagnostic Drawing Series (Cohen, Hammer, & Singer, 1988) and the Tree Rating Scale (Creekmore, 1989) as a means to research isomorphic representations in tree drawings. The tree drawings of 80 subjects, 20 of whom were diagnosed with Multiple Personality Disorder, 20 with Schizophrenia, 20 with Major Depression, and 20 in the Control population, were rated. Patterns which emerged within each diagnostic category were examined, and graphs were used to depict the results. Certain features were found to distinguish each diagnostic category. The descriptive statistical findings were both consistent and inconsistent with earlier Diagnostic Drawing Series research findings (Cohen, Hammer, & Singer, 1988; Creekmore, 1989; Kress, 1991, 1992; Mills, 1989; Mills & Cohen, 1993; Rankin, 1994; Torem, Gilbertson, & Light, 1990).