This study considered the accuracy of perception and production of the compound-phrasal contrast by Vietnamese-Australians learning English and examined phonological, demographic, and speaker normalization factors that might influence acquisition of the contrast. In the study, 32 Vietnamese subjects took part; their performance on the perception part of the study was compared to that of 32 native English-speaking Australians. Complexity of phonological environment, in terms of number of syllables and consonant clusters alien to Vietnamese phonology, and length of residence in Australia were found to be the major factors influencing both the perception and production of the contrast. Accuracy of perception and production were highly correlated. Australian subjects, while performing significantly better than Vietnamese subjects on the perception task, nevertheless demonstrated the same pattern of accuracy across different levels of phonological complexity as had the latter.

It is commonly found that most deaf readers display an overall depressed level of reading performance in conjunction with specific difficulties in complex syntax. In this study, deaf good and poor readers' comprehension of relative clause structures was tested in written English, signed English, and American Sign Language. It was found that the behavior of deaf good and poor readers was parallel across relative clause sentence types, and that the deaf readers generally performed similarly to hearing readers tested in a different study. These results support the hypothesis that a specific syntactic disability does not differentiate deaf good and poor readers. Instead, it is suggested that a processing deficit may underlie the poor readers' comprehension difficulties.

This study examined the spoken English development of a hearing child of deaf parents who used American Sign Language (ASL). The child first learned ASL in interactions with his parents and later developed spoken English outside the home environment. It was hypothesized that the child's acquisition of spoken English would systematically reflect both expected monolingual developmental patterns and interlinguistic transfer. Four areas of mismatch between ASL and spoken English were identified. Language sample data from ages 2;9–5;2 were examined for evidence to evaluate the hypotheses. Features that reflected the simultaneous versus sequential mismatch between ASL and English, undifferentiated versus differentiated aspects, free versus bound morpheme mechanisms, and word-order differences provided evidence of ASL influence on spoken English acquisition. Although not extensive, ASL appears to have exerted consistent influence on several areas of the child's spoken English development.

The adequacy of 11 metrics for measuring linguistic complexity was evaluated by applying each metric to language samples obtained from 30 different adult speakers, aged 60–90 years. The analysis then determined how well each metric indexed age-group differences in complexity. In addition, individual differences in the complexity of adults' language were examined as a function of these complexity metrics using structural equation modeling techniques. In a follow-up study, judges listened to sentences in noise, rated their comprehensibility, and attempted to recall each sentence verbatim. Hierarchical multiple regression was used to evaluate the structural equation model, derived from the language samples, with respect to sentence comprehensibility and recall. While most of the metrics provided an adequate account of age-group and individual differences in complexity, the amount of embedding and the type of embedding proved to predict how easily sentences are understood and how accurately they are recalled.

The unintelligible speech of many developmentally delayed children poses problems for language intervention and language assessment efforts. Eighteen developmentally delayed children in Brown's (1973) stage I and their parents participated in two studies of the relationship between verbal routines and the intelligibility of developmentally delayed children's speech. The first study demonstrated that more intelligible child speech was found in routines than in nonroutines. To determine if routine utterances were articulated more accurately than nonroutine utterances, the second study extracted a representative sample of routine and nonroutine utterances from their visual and discourse contexts and asked two naive observers to transcribe them. To investigate the possible effect of contextual information, the naive observers transcribed the extracted utterances under context-information-present and context-information- absent conditions. The results indicated that extracted utterances were more intelligible under context-information-present conditions. The results were interpreted as indicating that child speech was more intelligible in routines than nonroutines because routines provide adults with more context information for interpreting ambiguous child utterances.