One of us has extensive training in clinical neurology, and I don't think it's you. No, there can be initially subtle changes in cognitive or motor ability, memory, vision (visual cortex being at the posterior of the brain) or other neurologic function that aren't immediately obvious. And the indivdual may be at risk for further injury for a few weeks while the contusion heals.
"I may be synthetic but I'm not stupid"
Bishop, in "Aliens"