Question

You walk into a room and know that there's something you need, but in order to remember it, you have to go back to the room you started in and use your surroundings. this illustrates:

Answer 1

The answer is: The importance of retrieval cues in memory
Retrieval cues refers to the things that become a stimuli for you to retrieve a certain memory.
In the scenario above, the environment in your room become a stimuli for you to retrieve the information on the things you need when you walk out from your room.