When jeffrey slipped on the stairs and hit his head, he saw "stars" for several minutes. The "stars" were most likely a result of activity in jeffrey's ?

I believe the answer is: occipital lobes

occipital lobes is a part of our brain that regulates our visual procesing and contain the largest amount of anatomical region for the visual cortex. A damage or impact that happen in this area could make us perceive that we are seeing things that we are not suppose to be seeing.