Abstract
While there is ample evidence that the structure and function of visual cortical areas are affected by early visual deprivation, little is known of how early blindness modifies subcortical relay and association thalamic nuclei, as well as mesencephalic structures. Therefore, in the present multicenter study, we used MRI to measure volume of the superior and inferior colliculi, as well as of the thalamic nuclei relaying sensory and motor information to the neocortex, parcellated according to atlas-based thalamo-cortical connections, in 29 individuals with congenital blindness of peripheral origin (17 M, age 35.7 ± 14.3 years) and 29 sighted subjects (17 M, age 31.9 ± 9.0). Blind participants showed an overall volume reduction in the left (p = 0.008) and right (p = 0.007) thalami, as compared to the sighted individuals. Specifically, the lateral geniculate (i.e., primary visual thalamic relay nucleus) was 40 % reduced (left: p = 4 × 10−6, right: p < 1 × 10−6), consistent with findings from animal studies. In addition, associated thalamic nuclei that project to temporal (left: p = 0.005, right: p = 0.005), prefrontal (left: p = 0.010, right: p = 0.014), occipital (left: p = 0.005, right: p = 0.023), and right premotor (p = 0.024) cortical regions were also significantly reduced in the congenitally blind group. Conversely, volumes of the relay nuclei directly involved in auditory, motor, and somatosensory processing were not affected by visual deprivation. In contrast, no difference in volume was observed in either the superior or the inferior colliculus between the two groups. Our findings indicate that visual loss since birth leads to selective volumetric changes within diencephalic, but not mesencephalic, structures. Both changes in reciprocal cortico-thalamic connections or modifications in the intrinsic connectivity between relay and association nuclei of the thalamus may contribute to explain these alterations in thalamic volumes. Sparing of the superior colliculi is in line with their composite, multisensory projections, and with their not exclusive visual nature.
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Acknowledgments
LC would like to thank Dr. Francesco Tomaiuolo and Dr. Ludwig Barbaro for the helpful comments and suggestions provided. This work was supported by grants from the Italian Ministero dell’Istruzione, dell’Università e della Ricerca (PP, ER, LC, GH), the Lundbeck foundation (RK), the Danish Medical Research Council (MP), and the Harland Sanders Chair in Visual Science (Canada). The authors note professional manuscript proofreading by Inglewood Biomedical Editing.
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Cecchetti, L., Ricciardi, E., Handjaras, G. et al. Congenital blindness affects diencephalic but not mesencephalic structures in the human brain. Brain Struct Funct 221, 1465–1480 (2016). https://doi.org/10.1007/s00429-014-0984-5
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DOI: https://doi.org/10.1007/s00429-014-0984-5