It was hypothesized that beginners in psychology would find it more helpful to understand p.t.s, and especially their essence by reference to preceding theories based on metaphor than those based on field, because they have the root metaphor whereby to understand the p.t. in advance. Accordingly, I compared the understanding of a new p.c. presented after giving two p.t.s belonging to the same metaphor but to a different field with a condition where it was presented after giving two p.t.s belonging to a different metaphor but to the same field. The results were contrary to the hypothesis. The beginners fournd it more comprehensible when the field was the same. However, there were no difference in the undrstanding of its essence. Furthermore, when the first p.t. was similar to a new p.t. in the attached diagram in the metaphor condition, the new p.t. was found to be comprehensible in its essence. The results were considered from the perspective of abstractness in metaphor.