These authors contributed equally to this work.
Word-level intelligibility after caudal zona incerta stimulation for Parkinson's disease
Article first published online: 17 DEC 2013
© 2013 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd
Acta Neurologica Scandinavica
Volume 130, Issue 1, pages 27–33, July 2014
How to Cite
Word-level intelligibility after caudal zona incerta stimulation for Parkinson's disease. Acta Neurol Scand 2014: 130: 27–33. © 2013 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd., , , , , , , .
- Issue published online: 10 JUN 2014
- Article first published online: 17 DEC 2013
- Manuscript Accepted: 18 NOV 2013
- Swedish Research Council. Grant Numbers: 2009-946, 2011-2294
- Faculty of Humanities at Umeå University. Grant Number: 210-2554-12
- Parkinson Foundation in Sweden. Grant Number: 443/11
- caudal zona incerta;
- deep brain stimulation;
- Parkinson's disease;
- speech intelligibility
To investigate the effect of caudal zona incerta-deep brain stimulation (cZi-DBS) on word-level speech intelligibility in patients with Parkinson's disease, under both an optimal listening condition and a simulated more naturalistic listening condition.
Materials and methods
Spoken single words were extracted from read samples collected from 10 bilaterally implanted patients with PD pre- and post-cZi-DBS. Intelligibility was assessed through a transcription task performed by 32 naive listeners under two listening conditions: (i) with low-amplitude conversational speech added as background and (ii) with no added background noise. The listeners′ responses were scored in terms of agreement with the intended words.
Post-operatively, the total intelligibility score was significantly lower when cZi stimulation was switched on compared with off, for both listening conditions (with and without added background noise). Intelligibility was also significantly lower on stimulation compared with preoperative recordings, but only when assessed in the listening condition without background noise. The listening condition with added background noise resulted in significantly lower intelligibility scores compared with the no added noise condition for all stimulation conditions.
The results of this study indicate that cZi-DBS in patients with PD can be detrimental to word-level speech intelligibility.