Effect of stimulus context and response coding variables on word retrieval performances in dysphasia

Dunn, Nancy D.; Russell, Shelly; Drummond, Sakina S.

doi:10.1016/0021-9924(89)90017-8

Cited by 7 publications

(1 citation statement)

References 14 publications

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“…Insufficient lesion data (9/16 PWA) was obtained in this study to interpret the contribution of lesion site to these findings. Longer reaction times in PWA relative to NHCs have been reported on language tasks (Bose, van Lieshout, & Square, 2007; Dunn, Russell, & Drummond, 1989), regardless of modality. Additionally, McNeil and Kent (1990) revealed that participants described as having conduction aphasia with no clinically identifiable concomitant apraxia of speech or dysarthria, did demonstrate some deficits in motor control.…”

Section: Discussionmentioning

confidence: 90%

The effect of speaking rate on serial-order sound-level errors in normal healthy controls and persons with aphasia

et al. 2015

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Background Although many speech errors can be generated at either a linguistic or motoric level of production, phonetically well-formed sound-level serial-order errors are generally assumed to result from disruption of phonologic encoding (PE) processes. An influential model of PE (Dell, 1986; Dell, Burger & Svec, 1997) predicts that speaking rate should affect the relative proportion of these serial-order sound errors (anticipations, perseverations, exchanges). These predictions have been extended to, and have special relevance for persons with aphasia (PWA) because of the increased frequency with which speech errors occur and because their localization within the functional linguistic architecture may help in diagnosis and treatment. Supporting evidence regarding the effect of speaking rate on phonological encoding has been provided by studies using young normal language (NL) speakers and computer simulations. Limited data exist for older NL users and no group data exist for PWA. Aims This study tested the phonologic encoding properties of Dell's model of speech production (Dell, 1986; Dell,et al., 1997), which predicts that increasing speaking rate affects the relative proportion of serial-order sound errors (i.e., anticipations, perseverations, and exchanges). Methods & Procedures The effects of speech rate on the error ratios of anticipation/exchange (AE), anticipation/perseveration (AP) and vocal reaction time (VRT) were examined in 16 normal healthy controls (NHC) and 16 PWA without concomitant motor speech disorders. The participants were recorded performing a phonologically challenging (tongue twister) speech production task at their typical and two faster speaking rates. Outcomes & Results A significant effect of increased rate was obtained for the AP but not the AE ratio. Significant effects of group and rate were obtained for VRT. Conclusion Although the significant effect of rate for the AP ratio provided evidence that changes in speaking rate did affect PE, the results failed to support the model derived predictions regarding the direction of change for error type proportions. The current findings argued for an alternative concept of the role of activation and decay in influencing types of serial-order sound errors. Rather than a slow activation decay rate (Dell, 1986), the results of the current study were more compatible with an alternative explanation of rapid activation decay or slow build-up of residual activation.

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Section: Discussionmentioning

confidence: 90%