Boundaries of the mind
From The Art and Popular Culture Encyclopedia
Boundaries of the mind refers to a personality trait concerning the degree of separateness ("thickness") or connection ("thinness") between mental functions and processes. Thin boundaries are associated with open-mindedness, sensitivity, vulnerability, creativity, and artistic ability. People with thin boundaries may tend to confuse fantasy and reality and tend to have a fluid sense of identity, so that they tend to merge or lose themselves in their relations with others. People with thick boundaries differentiate clearly between reality and fantasy and between self and other, and tend to prefer well-defined social structures.