Oddly Wired
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emotion

Your brain creates a story to explain your physical reactions.

In a 1962 experiment, subjects were injected with adrenaline and told it was a vitamin, leading them to misinterpret their jittery nerves as happiness or anger depending on the social setting.

When the brain experiences unexplained physiological arousal, it scans the immediate environment for a cue to label the sensation. If a confederate acted euphoric, the subject reported feeling happy. If the confederate acted annoyed, the subject reported feeling angry.

The emotion you feel right now might be a guess based on your surroundings.

Where this comes from

Study
Schachter and Singer 1962
What the check found
The claim accurately reflects the design and intent of the 1962 Schachter and Singer study, though the scientific consensus on the Two-Factor Theory has evolved since its original publication.
Confidence
Well replicated

Related

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