1. How the speed of word finding depends on ventral tract integrity in primary progressive aphasia
- Author
-
Roy P. C. Kessels, Vitória Piai, Joanna Sierpowska, Margot Mangnus, Ardi Roelofs, and Nikki Janssen
- Subjects
Alzheimer`s disease Donders Center for Medical Neuroscience [Radboudumc 1] ,Picture-word interference ,Audiology ,lcsh:RC346-429 ,Psycholinguistics ,Primary progressive aphasia ,Language in Interaction ,0302 clinical medicine ,Neurofisiologia ,Names ,05 social sciences ,White matter ,220 Statistical Imaging Neuroscience ,Regular Article ,respiratory system ,Word finding ,medicine.anatomical_structure ,Neurology ,Aptitud verbal ,lcsh:R858-859.7 ,Psychology ,Afàsia ,Tractography ,medicine.medical_specialty ,110 000 Neurocognition of Language ,Cognitive Neuroscience ,Neurophysiology ,Verbal ability ,lcsh:Computer applications to medicine. Medical informatics ,050105 experimental psychology ,Diffusion MRI ,03 medical and health sciences ,Magnetic resonance imaging ,Atrophy ,Imatges per ressonància magnètica ,Aphasia ,medicine ,Humans ,0501 psychology and cognitive sciences ,Radiology, Nuclear Medicine and imaging ,lcsh:Neurology. Diseases of the nervous system ,Neurodevelopmental disorders Donders Center for Medical Neuroscience [Radboudumc 7] ,Neuro- en revalidatiepsychologie ,Neuropsychology and rehabilitation psychology ,medicine.disease ,Noise ,Aphasia, Primary Progressive ,Neurology (clinical) ,030217 neurology & neurosurgery - Abstract
Highlights • Noise words influence naming time, but not accuracy, more in PPA than in controls. • Noise effect difference between PPA and controls reflects ventral tract integrity. • The noise effect is smaller when ventral tract integrity is lower in the individuals with PPA. • Simulations reveal that propagation of noise is reduced when tract integrity is low., Primary progressive aphasia (PPA) is a clinical neurodegenerative syndrome with word finding problems as a core clinical symptom. Many aspects of word finding have been clarified in psycholinguistics using picture naming and a picture-word interference (PWI) paradigm, which emulates naming under contextual noise. However, little is known about how word finding depends on white-matter tract integrity, in particular, the atrophy of tracts located ventrally to the Sylvian fissure. To elucidate this question, we examined word finding in individuals with PPA and healthy controls employing PWI, tractography, and computer simulations using the WEAVER++ model of word finding. Twenty-three individuals with PPA and twenty healthy controls named pictures in two noise conditions. Mixed-effects modelling was performed on naming accuracy and reaction time (RT) and fixel-based tractography analyses were conducted to assess the relation between ventral white-matter integrity and naming performance. Naming RTs were longer for individuals with PPA compared to controls and, critically, individuals with PPA showed a larger noise effect compared to controls. Moreover, this difference in noise effect was differentially related to tract integrity. Whereas the noise effect did not depend much on tract integrity in controls, a lower tract integrity was related to a smaller noise effect in individuals with PPA. Computer simulations supported an explanation of this paradoxical finding in terms of reduced propagation of noise when tract integrity is low. By using multimodal analyses, our study indicates the significance of the ventral pathway for naming and the importance of RT measurement in the clinical assessment of PPA.
- Published
- 2020