Quote:
Other authors interpreted the affective instability of BPD as a form of prolonged ultra-rapid cycling with extreme rapid mood switching closely resembling classic descriptions of cyclothymia.
In a more hypothetical vein, we submit that cyclothymic disposition might represent the mediating core characteristic in this complex pattern of mood, anxiety, and impulsive disorders
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https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3048510/
Are atypical depression, borderline personality disorder and bipolar II disorder overlapping manifestations of a common cyclothymic diathesis? -- is the name of the article. All this is interesting stuff.