One theory is presented by Dr. Linehan’s. Linehan has developed a comprehensive sociobiological theory which appears to be borne out by the successes found in controlled studies of her Dialectical Behavioral Therapy.
Linehan theorizes that borderlines are born with an innate biological tendency to react more intensely to lower levels of stress than others and to take longer to recover. They peak "higher" emotionally on less provocation and take longer coming down. In addition, they were raised in environments in which their beliefs about themselves and their environment were continually devalued and invalidated. These factors combine to create adults who are uncertain of the truth of their own feelings and who are confronted by three basic dialectics they have failed to master (and thus rush frantically from pole to pole of):
- unremitting crises vs. inhibited grief.