Oddly Wired
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two factor theory

You interpret your bodily signals through social context.

Physiological arousal is ambiguous, and you use your environment to identify what the emotion means.

In a 1962 experiment, participants injected with adrenaline experienced heart palpitations but only reported feeling 'happy' or 'angry' depending on whether a confederate in the room acted that way. The brain searches for a situational cause for the physical sensation.

You don't know why you feel the way you do.

Where this comes from

Study
Schachter and Singer, 1962, Psychological Review
What the check found
The claim accurately summarizes the Two-Factor Theory of Emotion as presented in the cited 1962 study, though the study's original experimental findings have faced significant replication challenges in later years.
Confidence
Solid, with limits
two-factor theoryemotionarousal

Related

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