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  • Bogdan Raducan thinks this is interesting:

The earlier questions were memory for factual information, what is called declarative memory. The last question could have been answered factually, but is usually most easily answered by recalling the activities performed to open the door. This is called procedural memory.

From

Cover of The Design of Everyday Things: Revised and Expanded Edition

Note

Earlier questions were related to capitals of countries and phone numbers, whereas the latter involved recalling the side of the doorknob on a specific previous home.