Definition
The ego default is the reflex to protect the self-image — to win the argument, save face, or be seen as competent — instead of seeking what is actually true. It treats being wrong as a threat to identity rather than an opportunity to learn.
Parrish places it second among the four biological defaults. Where the emotion default reacts to feeling, the ego default reacts to status: anything that lowers it (criticism, contradiction, being shown up) triggers a protective response that has almost nothing to do with the merits of the situation.
The cleanest test: when new evidence contradicts a position you have stated publicly, does your first impulse feel like curiosity or defense?
Why it matters
How it works
The ego default activates whenever a piece of information has the structure "you are not as good as you think you are." The trigger can be tiny — a colleague's correction, a feedback note, a market move against your forecast. The response is a cascade of rationalisations whose unstated job is to keep the self-image intact.
Parrish's antidote is the explicit separation of self from position. A position is a guess about the world; the self is the person making the guess. Changing the guess is not a defeat of the self — it is exactly what a competent self does.