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Related Experiment Videos

Testing the generalized slowing hypothesis in specific language impairment.

J Windsor1, M Hwang

  • 1Department of Communication Disorders, University of Minnesota, Minneapolis 55455, USA. windsor@umn.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|October 9, 1999
PubMed
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Children with specific language impairment (SLI) exhibit generalized slower response times (RT) compared to their peers. This slowing is proportional across tasks, with some variation based on impairment type.

Area of Science:

  • Developmental Psychology
  • Linguistics
  • Cognitive Neuroscience

Background:

  • Children with Specific Language Impairment (SLI) often present with difficulties in language processing.
  • Previous research suggests potential underlying cognitive differences, including processing speed, in children with SLI.
  • Understanding response time (RT) patterns can offer insights into the cognitive mechanisms associated with SLI.

Purpose of the Study:

  • To investigate whether children with SLI demonstrate a generalized slowing of response time (RT) across various tasks.
  • To compare the RT performance of children with SLI to that of their chronological-age (CA) matched peers.
  • To evaluate different theoretical models (proportional, linear, nonlinear) explaining generalized slowing in SLI.

Main Methods:

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  • Regression analyses were performed on group RT data to test three theoretical models of generalized slowing.
  • Response times were collected across multiple tasks for children with SLI and a control group of CA peers.
  • Group RT data was analyzed to determine the best fit among the proposed models.

Main Results:

  • All three theoretical models (proportional, linear, nonlinear) demonstrated an excellent fit with the collected RT data.
  • The most parsimonious model indicated that children with SLI were proportionally slower than their CA peers across tasks.
  • On average, the SLI group's mean RTs were approximately 20% slower than those of the CA group.

Conclusions:

  • The findings support the hypothesis of generalized response time slowing in children with SLI.
  • The proportional slowing model provides the most straightforward explanation for the observed RT differences.
  • Expressive SLI showed less slowing than mixed expressive-receptive SLI, and not all children with SLI exhibited generalized slowing.