To incorporate constructs and processes from the second-language acquisition
literature into the standard/non-standard educational context, it might
also be useful to consider subgroups "A" and "B" in relation to Dulay and
Burt's (1978) "socio-affective filter". They suggest that the motives, attitudes
and emotional states of learners filter the language input that is
processed by them, and affect the rate and quality of acquisition (of standard
dialect, in the present discussion). They propose (p. 556) that the socioaffective
filter contributes to at least three aspects of selective learning: