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Pain is a multidimensional phenomenon with sensory, affective, and autonomic components. Here, we used parametric functional magnetic resonance imaging (fMRI) to correlate regional brain activity with autonomic responses to (i) painful stimuli and to (ii) anticipation of pain. The autonomic parameters used for correlation were (i) skin blood flow (SBF) and (ii) skin conductance response (SCR). During (i) experience of pain and (ii) anticipation of pain, activity in the insular cortex, anterior cingulate cortex (ACC), prefrontal cortex (PFC), posterior parietal cortex (PPC), secondary somatosensory cortex (S2), thalamus, and midbrain correlated with sympathetic outflow. A conjunction analysis revealed a common central sympathetic network for (i) pain experience and (ii) pain anticipation with similar correlations between brain activity and sympathetic parameters in the anterior insula, prefrontal cortex, thalamus, midbrain, and temporoparietal junction. Therefore, we here describe shared central neural networks involved in the central autonomic processing of the experience and anticipation of pain.

BackgroundThis systematic review aims to review the literature on trial-based economic evaluations of non-pharmacological interventions directly targeted at persons with dementia as well as persons with mild cognitive impairment and their respective caregivers.MethodsA systematic literature research was conducted for the timeframe from 2010 to 2016 in the following databases: Centre for Reviews and Dissemination, EconLit, Embase, Cochrane Library, PsycINFO and PubMed. Study quality was assessed according to the Drummond criteria.ResultsIn total sixteen publications were identified. Health economic evaluations indicated the cost-effectiveness of physical exercise interventions and occupational therapy. There was also evidence to suggest that psychological and behavioral therapies are cost-effective. Health economic studies investigating psychosocial interventions mainly targeted towards informal caregivers showed inconsistent results.ConclusionsDue to the increasing prevalence of dementia non-pharmacological interventions and their health economic impact are of increasing importance for health care decision-makers and HTA agencies.Electronic supplementary materialThe online version of this article (10.1186/s12877-018-0751-1) contains supplementary material, which is available to authorized users.

With this study, we identified central components associated with habituation to repetitive painful stimuli. The results suggest that an increase in tonic inhibitory activity in cortical pain processing areas is a major mechanism contributing to habituation to phasic noxious stimuli. Moreover, areas involved in descending pain modulation were differentially modulated. This may hint at a simultaneous activation of facilitating and inhibiting nociceptive systems that are both altered in the transdermal electrical pain model.

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