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In page Depersonalization:

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For the purposes of evaluation and measurement depersonalization can be conceived of as a construct and scales are now available to map its dimensions in time and space.[11] A study of undergraduate students found that individuals high on the depersonalization/derealization subscale of the Dissociative Experiences Scale exhibited a more pronounced cortisol response in stress. Individuals high on the absorption subscale, which measures a subject's experiences of concentration to the exclusion of awareness of other events, showed weaker cortisol responses.[12]