[2] In 1952, Karl Koch interpreted patterns according to principles of handwriting analysis after asking the subject to draw a tree.
[7] A psychologist or a psychiatrist will then evaluate the various aspects of the drawing as well as the individual's behavior or comments while completing the test.
The evaluation is based on standard criteria and scored from "very immature" to "very mature" while the essay is graded from advanced, normal, and backwards.
Plokker that the type of tree an individual draws relates to the structure of the psyche or unconscious itself or that it symbolizes one's personality as it can project self-image.
In 1966, Wayne Dennis analyzed children's drawings and found that they are great indicators of group values and cognitive functioning.
He concluded that drawing as a projective technique provides children with a good opportunity to express their personal feelings and their attitudes towards others and their environment.
According to Ursula Avé-Lallemant, the size of the tree and the width of the trunk symbolize "a sense of self-expression and the amount of mental energy".
Roberto and his colleagues researched the Baum test with a group of mild cognitively impaired (MCI) patients and controls.