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New, Anneliese B., Robin, Donald A., Parkinson, Amy L., Duffy, Joseph R., McNeil, Malcom R., Piguet, Olivier, Hornberger, Michael 
ORCID: https://orcid.org/0000-0002-2214-3788, Price, Cathy J., Eickhoff, Simon B. and Ballard, Kirrie J.
(2015)
Altered resting-state network connectivity in stroke patients with and without apraxia of speech.
NeuroImage: Clinical, 8.
pp. 429-439.
ISSN 2213-1582
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Abstract
Motor speech disorders, including apraxia of speech (AOS), account for over 50% of the communication disorders following stroke. Given its prevalence and impact, and the need to understand its neural mechanisms, we used resting state functional MRI to examine functional connectivity within a network of regions previously hypothesized as being associated with AOS (bilateral anterior insula (aINS), inferior frontal gyrus (IFG), and ventral premotor cortex (PM)) in a group of 32 left hemisphere stroke patients and 18 healthy, age-matched controls. Two expert clinicians rated severity of AOS, dysarthria and nonverbal oral apraxia of the patients. Fifteen individuals were categorized as AOS and 17 were AOS-absent. Comparison of connectivity in patients with and without AOS demonstrated that AOS patients had reduced connectivity between bilateral PM, and this reduction correlated with the severity of AOS impairment. In addition, AOS patients had negative connectivity between the left PM and right aINS and this effect decreased with increasing severity of non-verbal oral apraxia. These results highlight left PM involvement in AOS, begin to differentiate its neural mechanisms from those of other motor impairments following stroke, and help inform us of the neural mechanisms driving differences in speech motor planning and programming impairment following stroke.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | apraxia of speech,network connectivity,resting-state fmri,stroke |
| Faculty \ School: | Faculty of Medicine and Health Sciences > Norwich Medical School |
| UEA Research Groups: | Faculty of Medicine and Health Sciences > Research Groups > Mental Health Faculty of Medicine and Health Sciences > Research Centres > Lifespan Health |
| Related URLs: | |
| Depositing User: | Pure Connector |
| Date Deposited: | 04 Jan 2016 11:00 |
| Last Modified: | 19 Oct 2023 01:34 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/55903 |
| DOI: | 10.1016/j.nicl.2015.03.013 |
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