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The research described in this article had 2 aims: to permit greater precision in the conduct of naming experiments and to contribute to a characterization of the motor execution stage of speech production. The authors report an exhaustive inventory of consonantal and postconsonantal influences on delayed naming latency and onset acoustic duration, derived(More)
Presented in this article is a discussion of current progress in behavioral, cognitive, and neuroanatomic definitions of apraxia of speech (AOS). A behavioral definition summarizes the speech symptoms that should be considered diagnostic of AOS with or without co-occurring aphasia and dysarthria. AOS is defined in cognitive terms as an impairment in the(More)
There exist few clinical assessments for limb apraxia, a disorder of learned, purposeful action, that enable clinicians to distinguish pathological from normal variance in limb praxis performance. We describe a theoretically motivated, comprehensive assessment battery for limb apraxia and present control comparison scores for 16 older healthy normal(More)
Three experiments with undergraduate student participants investigated whether high frequency nonword syllables of English and non-existing English syllables showed differential effects on response latency, accuracy, onset and rime duration or spectral measures of coarticulation in syllable naming tasks. Only the coarticulation data provided any support for(More)
This article presents an introduction to psycholinguistic models of speech development. Two specific types of models are addressed: box-and-arrow models and connectionist or neural network models. We review some historical and some current models and discuss recent applications of such models to the management of speech impairment in children. We suggest(More)
PURPOSE The International Consensus Criteria for the diagnosis of primary progressive aphasia (PPA; Gorno-Tempini et al., 2011) propose apraxia of speech (AOS) as 1 of 2 core features of nonfluent/agrammatic PPA and propose phonological errors or absence of motor speech disorder as features of logopenic PPA. We investigated the sensitivity and specificity(More)
This paper presents an acoustic investigation of vowel production in reading, naming and repetition tasks by LM, a man with progressive non-fluent aphasia. Plots in the F1/F2 plane showing the centroids of the acoustic targets of [i: E A V O u: ] and the formant trajectories of [ai ei ou] demonstrate that LM achieved greater differentiation of targets in(More)
BACKGROUND Primary progressive aphasia (PPA) affects a range of language and cognitive domains that impact on conversation. Little is known about conversation breakdown in the semantic variant of PPA (svPPA, also known as semantic dementia). This study investigates conversation of people with svPPA. METHODS Dyadic conversations about everyday activities(More)