Oddly Wired
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social

You assume attractive people are also morally good.

While Thorndike identified the 'halo effect' as a general cognitive error in 1920, the systematic experimental finding that physical attractiveness correlates with perceived intelligence and morality was established later.

The specific link between attractiveness and perceived personality traits is primarily attributed to the 1972 study 'What is Beautiful is Good' by Karen Dion, Ellen Berscheid, and Elaine Walster.

You judge strangers by their face before you judge them by their actions.

Where this comes from

Study
Thorndike, 1920
What the check found
Thorndike coined the 'halo effect' in 1920, but the specific 'what is beautiful is good' finding is attributed to a 1972 study by Dion, Berscheid, and Walster.
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.