YOU cannot be serious if you think tennis umpires are not biased. They really do have a tendency to perceive balls as out even when they’re in.
Past experiments have shown that we tend to perceive moving objects as being slightly further along in their paths than they really are. This trait may have evolved to compensate for our sluggish visual system, which is always a split second behind reality.
In the tennis world, the illusion means line judges may call balls out when they were inside the line, according to researchers led by David Whitney of the University…
