ISO mo/ FACTl OiWU /0 of people can not tap their thumb knuckle against their lower teeth with their eyes closed more than 16 times without getting dizzy. Optic Thalamus | Radiol Nerve / |nner Ear Equilibrium <T> '* ' T^Trigeminal "F r ■ Nerve \ \ Supramandibular Reticulum N* Source: New