
Siblings of bipolar people are resilient to the disorder thanks to hyperconnectivity of the default mode network in the brain, a recent study suggests.
People with bipolar disorder are subject to extreme mood shifts, from feeling "high" to feeling absolutely "down." They also experience abnormal fluctuations in their energy levels, which can lead to disrupted activity patterns.
In the United States, the yearly prevalence of bipolar disorder among adults is approximately 2.6 percent, according to the National Institute of Mental Health (NIMH).