Social Studies

Aydin Key

20 October, 21:41

Ryan was really looking forward to lunch because his mother had prepared a tuna salad sandwich.

Unfortunately, the mayonnaise she used had been left out too long and was spoiled. Not long after

eating the sandwich, Ryan felt sick and had to rush to the bathroom. Thereafter, the mere mention

of a tuna sandwich would make Ryan nauseous.

1. What is the unconditioned stimulus?