frequency also correlated with poorer performance on the working memory task.
Some people say brain injuries could be caused not by heading
but by clashes of heads or elbows bashing heads.
Jeff Astle, whose football career was marked by his powerful headed goals, died from a degenerative brain disease caused by the constant heading
of a heavy and often wet leather ball in January 2002.
Despite the game's popularity and the possibility of head injuries, only a few researchers have looked at the effects of heading
Soccer experts have long debated the question of safety in heading
the ball, and though they've never arrived at a consensus of opinion, they agree that heading
can be made safer.