He also supports Penfield and Roberts ' ( 1959 ) proposal of neurological mechanisms responsible for maturational change in language learning abilities .
Lenneberg ( 1967 ) asserts that if no language is learned by puberty , it can not be learned in a normal , functional sense .
Lenneberg also supports Penfield and Roberts ' ( 1959 ) proposal of neurological mechanisms responsible for maturational change in language learning abilities .
Lenneberg ( 1967 ) asserts that if no language is learned by puberty , it can not be learned in a normal , functional sense .