This is a study by Kiki Chang, M.D., et al which discusses the amygdala's prominent role in emotion processing and response.The amygdala was found to be smaller in BD adolescents, and larger in adults taking lithium.

Recent research by Barbara Geller, M.D. and colleagues in an ongoing NIMH-financed study at Washington University in St. Louis found that hypersexual behavior was present in 43% of the kids with mania although only 1% of her sample had evidence of sexual abuse. The study included 93 children with mania whose average age was 10.9 years.