Oddly Wired
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bias

You take the credit and blame the world.

A 1975 study by Miller and Ross examined the self-serving bias, questioning whether the attribution of success to internal factors and failure to external ones is a defense mechanism or a byproduct of information processing.

The study was titled 'Self-serving biases in the attribution of causality: Fact or fiction?' and challenged the prevailing assumption that these attributions are exclusively ego-protective.

You are the hero of your own story and the victim of your own surroundings.

Where this comes from

Study
Miller and Ross, 1975
What the check found
While the study is the definitive citation for the topic, it argued that the bias was not solely a defensive ego-protection mechanism, but could be explained by information-processing asymmetries.
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.