There are definitely short-term cognitive consequences to getting hit in the head. The nausea you can experience with head trauma can also interfere with thinki

There are definitely short-term cognitive consequences to getting hit in the head. The nausea you can experience with head trauma can also interfere with thinking. After suffering a blow to the head, I was given a battery of cognitive tests: Repeat this sequence of numbers, and the like. Three days out I was failing the tests rather spectacularly. At five days everything was back to normal.