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Some people with clinical depression can't get out of bed. But what about those who exhibit other signs of depression who never stop moving, and may double down on their work?

Psychiatrist Dr. Judith Joseph says the second group often goes unnoticed, even by the people living it. She calls it "high-functioning depression": people who keep meeting their obligations at work and at home while quietly losing the ability to feel pleasure.

"When you are joyful, you have better physical health, you have better relationships, you have better productivity at work," Joseph said in an interview for the Your Turn podcast . "So why don't we prioritize it?"

At the center of Joseph's work is anhedonia: a reduced ability to feel joy, pleasure or interest in things that once brought those feelings. Joseph describes it as "the silent sister" of depression.

"One sister is depressed, and crying, and not getting out of bed, and getting all the attention," she says.…