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Cognitive Impairment In Treatment-Naïve Bipolar II and Unipolar Depression.

Arthur D P Mak1, Domily T Y Lau2, Alicia K W Chan2

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Young, treatment-naïve patients with bipolar II depression showed intact cognitive function compared to unipolar depression. This suggests bipolar II disorder may resemble bipolar I more than unipolar depression.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Psychology

Background:

  • Cognitive dysfunction is a hallmark of bipolar disorder, but medication effects complicate comparisons.
  • Bipolar II (BPII) and unipolar depression (UD) are distinct but overlapping disorders.

Purpose of the Study:

  • To compare cognitive function in treatment-naïve BPII depression, UD, and healthy controls.
  • To investigate the relationship between illness chronicity and cognitive function in these groups.

Main Methods:

  • Assessed executive function (WCST), cognitive speed (TMT-A), and memory (CAVLT, WMS-VR) in 20 BPII, 35 UD, and 35 control participants (aged 18-35).
  • All participants were treatment-naïve, currently depressed, and without history of psychosis or substance use.

Main Results:

  • Unipolar depression patients exhibited significantly slower cognitive speed and reduced cognitive flexibility.
  • Bipolar II depression patients displayed a relatively intact cognitive profile.
  • Verbal memory correlated with illness chronicity in BPII depression but not UD.

Conclusions:

  • Treatment-naïve BPII depression is characterized by relatively preserved cognitive function compared to UD.
  • The correlation between chronicity and memory in BPII suggests a closer link to Bipolar I Disorder than Unipolar Depression.