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Some 5.7 million US adults suffer from bipolar disorder, however, the only way to treat them during an episode is to watch for signs - but sometimes it is too late.
Now, researchers have developed an iPhone app that uses Apple's ResearchKit, allowing the technology to track and predict the user's mood and episodes by analyzing their keystrokes.
Called BiAffect, the technology screens typing speed, how hard keys are pressed and the frequency of the use of backspace and spellcheck, all of which can reveal if the person is experiencing depression or mania, reports Daily Mail.
The mental health app was developed by a team of psychiatrists, Alex Leow and Peter Nelson, from the University of Illinois at Chicago.
The idea was sparked after Nelson's 24-year-old son was diagnosed with bipolar disorder as a freshman in college.
"I began working on this idea many years ago as a way to help my son, and to see it come to fruition with this kind of recognition, and to know that the app will be out there to help people get a better understanding of this disorder is thrilling," Nelson said.
Bipolar disorder, which causes extreme mood swings between the emotional highs of manic episodes and low periods of depression, affects approximately 5.7 million, or 2.6 percent, of adult Americans, according to the National Institute of Mental Health.
And diagnosis relies on careful history-taking and examination.