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Which of the following would be unconditioned stimuli (US). capable of eliciting an involuntary response? (Choose all that apply)

food in the mouth for salivation
pain for quickly pulling away
saying "hi" for someone else saying "hi"
being tired for sitting down
thirst for putting money into a soda vending machine
bright light for pupils constricting

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Food in the mouth for salivation.

Pain for quickly pulling away.

Bright light for pupils constricting.
User Nelida
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