Dr. gregorian studies individuals' unconscious motivations. dr. gregorian's theoretical perspective is best described as

humanistic
psychodynamic
behavioral
cognitive

psychodynamic

Explanation:

psychodynamic  is one of the study of psychology in which any persons behavior, actions and thoughts are said to be affected by unconscious processing of external stimulus by the brain. Psycodynamics is also used to induce positive behavior traits in any individual by influencing unconscious segment of brain. some of the the disorders like adjustment disorders and posttraumatic stress disorders are treated using psychodynamic

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good question my friend