Imodeli yaklanywa ukuze ibhekane nezinguquko zesifo sezinyawo ezibangelwa isifo sikashukela, futhi ababambiqhaza bangelashwa ngalezi zinguquko.
■ Ukutheleleka okuncane okuzungeze izinzwane zokuqala, ezesibili, nezesithathu okubangela ukulimala okuhlaselayo.
■ Bonisa izilonda ezinyaweni ezinzima, njengokunqunywa kwezinzwane, unyawo lukaCharcot kanye nokubola kwesikhumba.
■ Izinto zomodeli zithambile futhi ziyanwebeka futhi zinezinzwane eziguquguqukayo.