Each time we reach for a coffee cup, the movement is different. According to the University of Fribourg, this variability is down to nerve cells, which the brain uses to correct every movement. The nerve cells act as the brain’s “optimal estimators” in that they combine real sensations with their own predictions, the University of Freiburg said on Wednesday. Fluctuations in movements are caused by proprioception, or the “sixth sense”, which provides information about the position of our body in