This paper asks whether concerns about social problems decline with age. Unconditional growth models (without covariates) revealed a decline over 25 years (age 18 to 43) in concerns about racial discrimination, treatment of Aboriginal Peoples, female job discrimination, unemployment and environmental pollution. Educational attainment was not…

In this paper we investigate the effect of variable input on the acquisition of grammar. More specifically, we examine the acquisition of the third person singular marker -s on the auxiliary "do" in comprehension and production in two groups of children who are exposed to similar varieties of English but that differ with respect to adult…

Variation in the parts of ASL signs (i.e., phonological variation) has been explained largely by reference to the influence of the preceding and the following segments. This article examines three linguistic variables in ASL: the sign deaf; the location of a class of signs represented by the verb know; and signs produced with a 1 handshape. For…