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      Journal of Pain Research (submit here)

      This international, peer-reviewed Open Access journal by Dove Medical Press focuses on reporting of high-quality laboratory and clinical findings in all fields of pain research and the prevention and management of pain. Sign up for email alerts here.

      52,235 Monthly downloads/views I 2.832 Impact Factor I 4.5 CiteScore I 1.2 Source Normalized Impact per Paper (SNIP) I 0.655 Scimago Journal & Country Rank (SJR)

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      Altered homotopic connectivity in postherpetic neuralgia: a resting state fMRI study.

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          Abstract

          The aim of this study was to explore interhemispheric intrinsic connectivity in patients with postherpetic neuralgia (PHN).

          Most cited references26

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          Growing together and growing apart: regional and sex differences in the lifespan developmental trajectories of functional homotopy.

          Xi-Nian Zuo, Clare Kelly, Adriana Di Martino … (2010)
          Functional homotopy, the high degree of synchrony in spontaneous activity between geometrically corresponding interhemispheric (i.e., homotopic) regions, is a fundamental characteristic of the intrinsic functional architecture of the brain. However, despite its prominence, the lifespan development of the homotopic resting-state functional connectivity (RSFC) of the human brain is rarely directly examined in functional magnetic resonance imaging studies. Here, we systematically investigated age-related changes in homotopic RSFC in 214 healthy individuals ranging in age from 7 to 85 years. We observed marked age-related changes in homotopic RSFC with regionally specific developmental trajectories of varying levels of complexity. Sensorimotor regions tended to show increasing homotopic RSFC, whereas higher-order processing regions showed decreasing connectivity (i.e., increasing segregation) with age. More complex maturational curves were also detected, with regions such as the insula and lingual gyrus exhibiting quadratic trajectories and the superior frontal gyrus and putamen exhibiting cubic trajectories. Sex-related differences in the developmental trajectory of functional homotopy were detected within dorsolateral prefrontal cortex (Brodmann areas 9 and 46) and amygdala. Evidence of robust developmental effects in homotopic RSFC across the lifespan should serve to motivate studies of the physiological mechanisms underlying functional homotopy in neurodegenerative and psychiatric disorders.
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            Functional connectivity density mapping.

            Dardo Tomasi, Nora D. Volkow (2010)
            Brain networks with energy-efficient hubs might support the high cognitive performance of humans and a better understanding of their organization is likely of relevance for studying not only brain development and plasticity but also neuropsychiatric disorders. However, the distribution of hubs in the human brain is largely unknown due to the high computational demands of comprehensive analytical methods. Here we propose a 10(3) times faster method to map the distribution of the local functional connectivity density (lFCD) in the human brain. The robustness of this method was tested in 979 subjects from a large repository of MRI time series collected in resting conditions. Consistently across research sites, a region located in the posterior cingulate/ventral precuneus (BA 23/31) was the area with the highest lFCD, which suggest that this is the most prominent functional hub in the brain. In addition, regions located in the inferior parietal cortex (BA 18) and cuneus (BA 18) had high lFCD. The variability of this pattern across subjects was <36% and within subjects was 12%. The power scaling of the lFCD was consistent across research centers, suggesting that that brain networks have a "scale-free" organization.
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              Decreased interhemispheric functional connectivity in autism.

              Janet E Lainhart, Nicholas Lange, Tracy Abildskov … (2011)
              The cortical underconnectivity theory asserts that reduced long-range functional connectivity might contribute to a neural mechanism for autism. We examined resting-state blood oxygen level-dependent interhemispheric correlation in 53 males with high-functioning autism and 39 typically developing males from late childhood through early adulthood. By constructing spatial maps of correlation between homologous voxels in each hemisphere, we found significantly reduced interhemispheric correlation specific to regions with functional relevance to autism: sensorimotor cortex, anterior insula, fusiform gyrus, superior temporal gyrus, and superior parietal lobule. Observed interhemispheric connectivity differences were better explained by diagnosis of autism than by potentially confounding neuropsychological metrics of language, IQ, or handedness. Although both corpus callosal volume and gray matter interhemispheric connectivity were significantly reduced in autism, no direct relationship was observed between them, suggesting that structural and functional metrics measure different aspects of interhemispheric connectivity. In the control but not the autism sample, there was decreasing interhemispheric correlation with subject age. Greater differences in interhemispheric correlation were seen for more lateral regions in the brain. These findings suggest that long-range connectivity abnormalities in autism are spatially heterogeneous and that transcallosal connectivity is decreased most in regions with functions associated with behavioral abnormalities in autism. Autism subjects continue to show developmental differences in interhemispheric connectivity into early adulthood.
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                Author and article information

                Journal
                Journal ID (iso-abbrev): J Pain Res
                Title: Journal of pain research
                Publisher: Informa UK Limited
                ISSN: 1178-7090
                ISSN (Print): 1178-7090
                Publication date (Electronic): 2016
                Volume: 9
                Affiliations
                [1 ] Department of Radiology.
                [2 ] Department of Pain, The First Affiliated Hospital, Nanchang University, Nanchang, Jiangxi, People's Republic of China.
                Article
                Publisher Item ID: jpr-9-877
                DOI: 10.2147/JPR.S117787
                PMC ID: 5096754
                PubMed ID: 27826209
                SO-VID: b0d611f9-d6c3-4e83-9bf1-0bd56a122285
                History

                Keywords: functional magnetic resonance imaging,pain,postherpetic neuralgia,resting state,voxel-mirrored homotopic connectivity
                Data availability:
                Keywords: functional magnetic resonance imaging, pain, postherpetic neuralgia, resting state, voxel-mirrored homotopic connectivity

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