Oddly Wired
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ego

You claim personal credit for wins but blame luck.

A 1978 study showed that participants took credit for success but attributed failure to external variables like test difficulty.

To maintain self-esteem, you internalize positive results as reflections of your ability while distancing yourself from negative results. This protects your ego, but obscures the reality of your performance.

You are your own most generous and least accurate judge.

Where this comes from

Study
Bradley (1978), Self-Serving Bias
What the check found
G.W. Bradley's 1978 study is the standard, foundational citation for the 'self-serving bias' in social psychology, though the provided reference material does not explicitly contain the study text.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.