Janet I. Vousden

Serial Control of Phonology in Speech Production: A Hierarchical Model

A dynamic oscillator-based model of the sequencing of phonemes in speech production (OSCAR) is described. An analysis of phoneme movement errors (anticipations, perseverations, and exchanges) from a large naturalistic speech error corpus provides a new set of data suitable for quantitative modeling and is used to derive a set of constraints that any speech-production model must address. The new computational model is shown to account for error type proportions, movement error distance gradients, the syllable-position effect, and phonological similarity effects. The model provides an alternative to frame-based accounts, serial buffer accounts, and associative chaining theories of serial order processing in speech.

Identification, of tone duration, line length, and letter position : an experimental approach to timing and working memory deficits in schizophrenia

Patients with schizophrenia display numerous cognitive deficits, including problems in working memory, time estimation, and absolute identification of stimuli. Research in these fields has traditionally been conducted independently. We examined these cognitive processes using tasks that are structurally similar and that yield rich error data. Relative to healthy control participants (n = 20), patients with schizophrenia (n = 20) were impaired on a duration identification task and a probed-recall memory task but not on a line-length identification task. These findings do not support the notion of a global impairment in absolute identification in schizophrenia. However, the authors suggest that some aspect of temporal information processing is indeed disturbed in schizophrenia.

To Repeat or Not to Repeat: The Time Course of Response Suppression in Sequential Behaviour

Data from the study of human speech, spelling, and short-term memory for serial order are often taken to reflect the operation of post-output response suppression mechanisms. This inhibitory processing forms a central component of many models of human sequential behaviour. In this paper an oscillator-based model of sequential behaviour is used to show that varying the time-course of response suppression, in accordance with task demands, can explain differences in the error patterns produced in different sequential cognitive tasks. More specifically, we show that increasing the response suppression in a model of speech production causes the models error patterns to change and become similar to those observed in human short-term memory for serial order.

Amnesia, rehearsal, and temporal distinctiveness models of recall

Classical amnesia involves selective memory impairment for temporally distant items in free recall (impaired primacy) together with relative preservation of memory for recency items. This abnormal serial position curve is traditionally taken as evidence for a distinction between different memory processes, with amnesia being associated with selectively impaired long-term memory. However recent accounts of normal serial position curves have emphasized the importance of rehearsal processes in giving rise to primacy effects and have suggested that a single temporal distinctiveness mechanism can account for both primacy and recency effects when rehearsal is considered. Here we explore the pattern of strategic rehearsal in a patient with very severe amnesia. When the patient’s rehearsal pattern is taken into account, a temporal distinctiveness model can account for the serial position curve in both amnesic and control free recall. The results are taken as consistent with temporal distinctiveness models of free recall, and they motivate an emphasis on rehearsal patterns in understanding amnesic deficits in free recall.

Real books vs reading schemes: a new perspective from instructional psychology

A fiercely contested debate in teaching reading concerns the respective roles and merits of reading schemes and real books. Underpinning the controversy are different philosophies and beliefs about how children learn to read. However, to some extent debates have largely been rhetoric‐driven, rather than research‐driven. This article provides a theoretical perspective derived from instructional psychology and explores the assumptions that have been made about the use of real books and reading schemes, which have tended to polarise arguments about their respective strengths and limitations. It analyses the structures of adult literature, children’s real books, and reading schemes, and examines the demands that they make on children’s sight vocabulary and phonic skills. The critical high‐frequency words and grapheme–phoneme correspondences (GPCs) are identified that will enable children to read the majority of phonically regular and irregular words that they encounter which, perhaps surprisingly, occur more often in real books than structured reading schemes. Learning additional sight words or GPCs is of limited value due to their relatively low occurrence in written English and, thus, potentially minimal impact on children’s reading. Finally, the implications of this research for teaching reading are considered, particularly the complementary roles of real books and teaching methods derived from instructional psychology. In the past they have been viewed as diametrically opposed and mutually exclusive.

Speech errors across the lifespan

Dell, Burger, and Svec (1997) proposed that the proportion of speech errors classified as anticipations (e.g., “moot and mouth”) can be predicted solely from the overall error rate, such that the greater the error rate, the lower the anticipatory proportion (AP) of errors. We report a study examining whether this effect applies to changes in error rates that occur developmentally and as a result of ageing. Speech errors were elicited from 8- and 11-year-old children, young adults, and older adults. The error rate decreased and the AP increased from children to young adults, but neither error rate nor AP differed significantly between young and older adults. In cases where fast speech resulted in a higher error rate than slow speech, the AP was lower. Thus, there was overall support for Dell et al.s prediction from speech error data across the lifespan.

The Immediate and Longer Term Effectiveness of a Speech Rhythm-Based Reading Intervention for Beginning Readers

Despite empirical evidence of a relationship between sensitivity to speech rhythm and reading, there have been few studies that have examined the impact of rhythmic training on reading attainment, and no intervention study has focused on speech rhythm sensitivity specifically to enhance reading skills. Seventy-three typically developing 4- to 5-year-old children were randomly allocated to one of three treatment groups and received a speech-rhythm-based intervention, a phonological-awareness-based intervention, or a control intervention over 10 weeks. All children completed pre-test, post-test and delayed post-test measures of speech rhythm sensitivity, single-word reading, phonological awareness and vocabulary. The results show that it is possible to train speech rhythm sensitivity in this age group and that children who undertook the speech rhythm intervention showed a significant improvement in their word reading performance compared to children in the control group. Group differences were maintained 3 months later.

Regular ArticleSerial Control of Phonology in Speech Production: A Hierarchical Model☆

A dynamic oscillator-based model of the sequencing of phonemes in speech production (OSCAR) is described. An analysis of phoneme movement errors (anticipations, perseverations, and exchanges) from a large naturalistic speech error corpus provides a new set of data suitable for quantitative modeling and is used to derive a set of constraints that any speech-production model must address. The new computational model is shown to account for error type proportions, movement error distance gradients, the syllable-position effect, and phonological similarity effects. The model provides an alternative to frame-based accounts, serial buffer accounts, and associative chaining theories of serial order processing in speech.