Depression

Depression surfaces in Kyle’s notes as both a personal-history thread and an epidemiological one. In John Quincy Adams, Traub traces Adams’ lifelong struggle with what Adams called “the blue devils” from college onward — and how he “summoned the will to become the person his parents told him he must be” despite it. The book notes that over time his most debilitating symptoms subsided, “while the self-accusation, the expectation of bad endings, would prove almost impervious to contrary experience. He would, after all, succeed greatly. But John Quincy Adams was not fashioned to be happy.” His wife Louisa is described as carrying her own deep depression, preoccupied with death since the loss of an infant daughter.

In The Boy Who Was Raised as a Dog, Bruce Perry frames depression at the population level, tying rising rates across generations to social disconnection: a person born in 1905 had a 1% chance of an episode by age seventy-five, while 6% of those born in 1955 had had a serious episode by their twenty-fourth birthday, with teen rates up tenfold in recent decades. Perry also warns of a mechanism — ruminating on past negative events can exacerbate depression and, given how Memory works, can darken ambiguous old memories until they harden into traumas that never actually occurred.

Context: Depression is a clinical mood disorder marked by persistent low mood, loss of interest, and impaired functioning; modern research emphasizes both biological and social contributors, and rumination is a well-documented maintaining factor.

Where this appears

• John Quincy Adams — Adams’ lifelong “blue devils,” the self-accusation that outlasted his successes, and Louisa Adams’ own deep depression
• The Boy Who Was Raised as a Dog — generational rise in depression tied to social disconnection, and rumination as a self-reinforcing trap