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An enduring hypothesis is that knotholes, broken branches, damaged trunks, and leafless trees are indicative of traumatic episodes in an individual's life. This paper reviews selected past research which does not definitively confirm or deny the basic hypothesis and reports a current study based on tree drawings from the Diagnostic Drawing Series Archive. Suggestions for possible further areas of research on this topic utilizing the Diagnostic Drawing Series are presented.
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Anita B. Rankin (1994) studied this question.
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