This study examined the acquisition of the non-sibilant anterior fricatives /v, θ, ð/ by adult second language (L2) English talkers. Twenty-four Mandarin Chinese-L2 English talkers read aloud fricative-initial words. These talkers were chosen as their L1 contained /f/ but not /v, θ, ð/. Twenty L1 English listeners were asked to identify the L2-produced speech and rate the talker’s accent. On average, 69% of the fricatives were correctly identified. /v/ was the most difficult to correctly identify and was identified less accurately than /θ/ and /ð/. A ‘moderate’ accent was reported by L1 listeners, but accent rating did not predict L1 identification behavior. An exploratory acoustic analysis involving the correctly identified words from 22 talkers revealed that L2 talkers produced mean temporal differences used for voicing in line with published L1 data. Non-sibilant fricatives – particularly /v/ – may require pedagogical interventions to push L2 talkers off their learning plateau.
example, adult second-language learners nearly always retain an immediately identifiable foreign accent, including some who display perfect grammar. A possible
The critical period hypothesis is a hypothesis within the field of linguistics and second language acquisition that claims a person can achieve native-like fluency in a language only before a certain age. It is the subject of a long-standing debate in linguistics and language acquisition over the extent to which the ability to acquire language is biologically linked to developmental stages of the
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Chomsky (1969) asserts that environmental factors must be relatively unimportant for language emergence, as so many different factors surround children acquiring L1. Instead, Chomsky claims language learners possess innate principles building a 'language acquisition device' (LAD) in the brain. These principles denote restricted possibilities for variation within the language, and enable learners to construct a grammar out of 'raw input' collected from the environment. Input alone cannot explain language acquisition because it is degenerated by characteristic features such as stutters, and lacks corrections from which learners discover incorrect variations.
Singleton and Newport (2004) demonstrate the function of UG in their study of 'Simon'. Simon learned ASL as his L1 from parents who had learned it as an L2 after puberty and provided him with imperfect models. Results showed Simon learned normal and logical rules and was able to construct an organised linguistic system, despite being exposed to inconsistent input. Chomsky developed UG to explain L1 acquisition data, but maintains it also applies to L2 learners who achieve near-native fluency not attributable solely to input and interaction (Chomsky 1969).
Although it does not describe an optimal age for SLA, the theory implies that younger children can learn languages more easily than older learners, as adults must reactivate principles developed during L1 learning and forge an SLA path: children can learn several languages simultaneously as long as the principles are still active and they are exposed to sufficient language samples (Pinker, 1995). The parents of Singleton and Newport's (2004) patient also had linguistic abilities in line with these age-related predictions; they learned ASL after puberty and never reached complete fluency.
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