What you get is a highly selective loss of one function, with other functions being preserved intact, and this gives you some confidence in asserting that that part of the brain is somehow involved in mediating that function.
U stvari, dobijemo visoko selektivan gubitak jedne funkcije dok druge funkcije mozga ostanu netaknute, na temelju čega možemo pouzdano pretpostaviti da je taj dio mozga umiješan u ostvarivanje te određene funkcije.