Cognition is the use of your muscles and your joints, your joints moving to the left would be cognition its kind of like how cogs (gears) move in a clock which is also cognition. although in this sense it should most likely be considered awareness like testing his reflexes
Cognition in medicine is often used to make reference to a state of awarenes and capability of the brain and body to carry on with its normal activities, for example when you pass out it is said that you loss consciousness, so several tests are done to test the mental awareness of people, wheter is reading, speaking, memorizing things or even telling the daily routine can help find problems with consciousness and that cna reflect severe brain problems.
