Typically patients will not fix their eyes on anything for a sustained period, but in rare instances they may briefly follow a moving object or turn fleetingly toward a loud sound.

• 病患往往无法盯著任一物件太久，在罕见的情况下，他们的眼睛会短暂地追随移动的物体，或是迅速将头转向发出巨响的方位。