Depressive cognitive triad?

How do cognitive psychologists explain the depressive cognitive triad?

ok ok, I'll bite
without reference, it's all about self awareness n mental feedback of your state of mind n body. if something negative that happened externally that u can't attribute it to any obvious cause, those feelings are internalized to one self. It's happening but it's unexplained so it must be me. the snowball effect rolls over to one's perception of succeeding events in a negative light. hence, a spiral effect downwards.

if you believe this is BS then God knows I tried
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