Evidence for the involvement of a nonlexical route in the repetition of familiar words: A comparison of single and dual route models of auditory repetition

Hanley, J. Richard; Dell, Gary S.; Kay, Janice; Baron, Rachel

doi:10.1080/02643290342000339

Cited by 56 publications

(25 citation statements)

References 15 publications

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“…In Foygel and Dell (2000), the single-route SP model was used to simulate repetition, without explicitly modeling the auditory input, by assuming that perfect auditory recognition delivers a boost directly to lexical units, essentially just the second step of naming. Later, to account for patients with poor naming but spared repetition abilities, a direct input-to-output phonology route was added to the model (Hanley, Dell, Kay, & Baron, 2004). This dual-route model grafts the “nonlexical” route on to SP, leaving the architecture and simulations of naming unchanged; the two routes are used only during repetition.…”

Section: Discussionmentioning

confidence: 99%

Bridging computational approaches to speech production: The semantic–lexical–auditory–motor model (SLAM)

Walker

Hickok

2015

Psychon Bull Rev

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Speech production is studied from both psycholinguistic and motor-control perspectives, with little interaction between the approaches. We assessed the explanatory value of integrating psycholinguistic and motor-control concepts for theories of speech production. By augmenting a popular psycholinguistic model of lexical retrieval with a motor-control-inspired architecture, we created a new computational model to explain speech errors in the context of aphasia. Comparing the model fits to picture-naming data from 255 aphasic patients, we found that our new model improves fits for a theoretically predictable subtype of aphasia: conduction. We discovered that the improved fits for this group were a result of strong auditory-lexical feedback activation, combined with weaker auditory-motor feedforward activation, leading to increased competition from phonologically related neighbors during lexical selection. We discuss the implications of our findings with respect to other extant models of lexical retrieval.

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Section: Discussionmentioning

confidence: 99%

Bridging computational approaches to speech production: The semantic–lexical–auditory–motor model (SLAM)

Walker

Hickok

2015

Psychon Bull Rev

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“…These patients were more accurately fit by the summation dual-route model. However, for the majority of patients, the summation dual-route model predicted higher accuracy than was actually observed (see also [24]). …”

Section: The Interactive Two-step Account Of Word Repetitionmentioning

confidence: 87%

“…Dell and co-workers [24,30,64] carried out a series of computational studies of repetition in which they modified the basic naming model to instantiate different accounts of the relationship between naming and repetition, and then fit the alternative models to word repetition data from individual subjects or case series data. As a general feature, the implemented models included separate units and connections for phonological input and output processing ( [65]; see [66] for a different approach), and the input processes were assumed to be intact, both in the model and in the patients whose data were simulated.…”

Section: The Interactive Two-step Account Of Word Repetitionmentioning

confidence: 99%

“…To implement the summation dual-route account, a nonlexical route was grafted on to the interactive two-step model [24]. This route consisted of a single input node outside the model, which connected to the model's output phonemes via connections whose weights represent the strength of the nonlexical route ( figure 3).…”

Section: The Interactive Two-step Account Of Word Repetitionmentioning

confidence: 99%

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Theoretical analysis of word production deficits in adult aphasia

Schwartz

2014

Phil. Trans. R. Soc. B

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The cognitive analysis of adult language disorders continues to draw heavily on linguistic theory, but increasingly it reflects the influence of connectionist, spreading activation models of cognition. In the area of spoken word production, ‘localist’ connectionist models represent a natural evolution from the psycholingistic theories of earlier decades. By contrast, the parallel distributed processing framework forces more radical rethinking of aphasic impairments. This paper exemplifies these multiple influences in contemporary cognitive aphasiology. Topics include (i) what aphasia reveals about semantic-phonological interaction in lexical access; (ii) controversies surrounding the interpretation of semantic errors and (iii) a computational account of the relationship between naming and word repetition in aphasia. Several of these topics have been addressed using case series methods, including computational simulation of the individual, quantitative error patterns of diverse groups of patients and analysis of brain lesions that correlate with error rates and patterns. Efforts to map the lesion correlates of nonword errors in naming and repetition highlight the involvement of sensorimotor areas in the brain and suggest the need to better integrate models of word production with models of speech and action.

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“…In addition, many models allow a further repetition route via a semantic pathway (McCarthy and Warrington, 1984; Hillis and Caramazza, 1991; Hanley and Kay, 1997; Hanley et al, 2004; Dell et al, 2007; Nozari et al, 2010). Word repetition is commonly impaired in aphasia, and has classically been used as a diagnostic screening test (Kaplan, 1983).…”

Section: Introductionmentioning

confidence: 99%

Sources of Phoneme Errors in Repetition: Perseverative, Neologistic, and Lesion Patterns in Jargon Aphasia

Pilkington

Keidel

Kendrick

et al. 2017

Front. Hum. Neurosci.

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This study examined patterns of neologistic and perseverative errors during word repetition in fluent Jargon aphasia. The principal hypotheses accounting for Jargon production indicate that poor activation of a target stimulus leads to weakly activated target phoneme segments, which are outcompeted at the phonological encoding level. Voxel-lesion symptom mapping studies of word repetition errors suggest a breakdown in the translation from auditory-phonological analysis to motor activation. Behavioral analyses of repetition data were used to analyse the target relatedness (Phonological Overlap Index: POI) of neologistic errors and patterns of perseveration in 25 individuals with Jargon aphasia. Lesion-symptom analyses explored the relationship between neurological damage and jargon repetition in a group of 38 aphasia participants. Behavioral results showed that neologisms produced by 23 jargon individuals contained greater degrees of target lexico-phonological information than predicted by chance and that neologistic and perseverative production were closely associated. A significant relationship between jargon production and lesions to temporoparietal regions was identified. Region of interest regression analyses suggested that damage to the posterior superior temporal gyrus and superior temporal sulcus in combination was best predictive of a Jargon aphasia profile. Taken together, these results suggest that poor phonological encoding, secondary to impairment in sensory-motor integration, alongside impairments in self-monitoring result in jargon repetition. Insights for clinical management and future directions are discussed.

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Evidence for the involvement of a nonlexical route in the repetition of familiar words: A comparison of single and dual route models of auditory repetition

Cited by 56 publications

References 15 publications

Bridging computational approaches to speech production: The semantic–lexical–auditory–motor model (SLAM)

Bridging computational approaches to speech production: The semantic–lexical–auditory–motor model (SLAM)

Theoretical analysis of word production deficits in adult aphasia

Sources of Phoneme Errors in Repetition: Perseverative, Neologistic, and Lesion Patterns in Jargon Aphasia

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