“Theories of embodied perception suggest that nonvisual factors impact what we actually see”

 

The parody of a smile became a snarl. His face flushed dark and ugly.

River's End

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MissLunaRose12, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons

When you learn someone you trusted did something bad, fear affects how you perceive their appearance too. 

YAHOO!