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2015 ; 10
(11
): e0142234
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Neuroanatomical Correlates of Theory of Mind Deficit in Parkinson s Disease: A
Multimodal Imaging Study
#MMPMID26559669
Díez-Cirarda M
; Ojeda N
; Peña J
; Cabrera-Zubizarreta A
; Gómez-Beldarrain MÁ
; Gómez-Esteban JC
; Ibarretxe-Bilbao N
PLoS One
2015[]; 10
(11
): e0142234
PMID26559669
show ga
BACKGROUND: Parkinson's disease (PD) patients show theory of mind (ToM) deficit
since the early stages of the disease, and this deficit has been associated with
working memory, executive functions and quality of life impairment. To date,
neuroanatomical correlates of ToM have not been assessed with magnetic resonance
imaging in PD. The main objective of this study was to assess cerebral correlates
of ToM deficit in PD. The second objective was to explore the relationships
between ToM, working memory and executive functions, and to analyse the neural
correlates of ToM, controlling for both working memory and executive functions.
METHODS: Thirty-seven PD patients (Hoehn and Yahr median = 2.0) and 15 healthy
controls underwent a neuropsychological assessment and magnetic resonance images
in a 3T-scanner were acquired. T1-weighted images were analysed with voxel-based
morphometry, and white matter integrity and diffusivity measures were obtained
from diffusion weighted images and analysed using tract-based spatial statistics.
RESULTS: PD patients showed impairments in ToM, working memory and executive
functions; grey matter loss and white matter reduction compared to healthy
controls. Grey matter volume decrease in the precentral and postcentral gyrus,
middle and inferior frontal gyrus correlated with ToM deficit in PD. White matter
in the superior longitudinal fasciculus (adjacent to the parietal lobe) and white
matter adjacent to the frontal lobe correlated with ToM impairment in PD. After
controlling for executive functions, the relationship between ToM deficit and
white matter remained significant for white matter areas adjacent to the
precuneus and the parietal lobe. CONCLUSIONS: Findings reinforce the existence of
ToM impairment from the early Hoehn and Yahr stages in PD, and the findings
suggest associations with white matter and grey matter volume decrease. This
study contributes to better understand ToM deficit and its neural correlates in
PD, which is a basic skill for development of healthy social relationships.