This question already has an answer here:
In Star Wars: A New Hope (1977), after been attacked by Sand People, we see Luke Skywalker laying inert in the ground, then, we hear a great howling moan echoing throughout the canyon which sends the Sand People flees in terror. After that, a shabby Kenobi leans over Luke and touches his head for few seconds. Why?
It looks to me that he was evaluating Luke's temporal pulse but also could have been that he tried to read Luke's mind or used the Force to heal/awake him.
Regarding the alleged duplicate question:
It asks for a description of the action about doing/touching; but instead, my 'why does Kenobi touch...? differs from it because it asks for an explanation about touching.
The chosen answer to the other question, besides showing other characters' similar actions/behaviors, was rightly: Kenobi was possibly checking for a sign of life by using a technique.
Regarding my question, as you surely have noticed, it has arisen interesting potential responses which include, for example, one of the first uses of the Force in the Star Wars film saga.
In view of the above, I believe that there is no duplication of posts here.