Neural correlates of blink suppression and the buildup of a natural bodily urge |
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Authors: | Berman Brian D Horovitz Silvina G Morel Brent Hallett Mark |
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Institution: | a Department of Neurology, University of Colorado Denver, Denver, CO, USAb Human Motor Control Section, National Institute of Neurological Disorders and Stroke (NINDS), National Institutes of Health, Bethesda, MD, USAc Emory University, Atlanta, GA, USA |
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Abstract: | Neuroimaging studies have elucidated some of the underlying physiology of spontaneous and voluntary eye blinking; however, the neural networks involved in eye blink suppression remain poorly understood. Here we investigated blink suppression by analyzing fMRI data in a block design and event-related manner, and employed a novel hypothetical time-varying neural response model to detect brain activations associated with the buildup of urge. Blinks were found to activate visual cortices while our block design analysis revealed activations limited to the middle occipital gyri and deactivations in medial occipital, posterior cingulate and precuneus areas. Our model for urge, however, revealed a widespread network of activations including right greater than left insular cortex, right ventrolateral prefrontal cortex, middle cingulate cortex, and bilateral temporo-parietal cortices, primary and secondary face motor regions, and visual cortices. Subsequent inspection of BOLD time-series in an extensive ROI analysis showed that activity in the bilateral insular cortex, right ventrolateral prefrontal cortex, and bilateral STG and MTG showed strong correlations with our hypothetical model for urge suggesting these areas play a prominent role in the buildup of urge. The involvement of the insular cortex in particular, along with its function in interoceptive processing, helps support a key role for this structure in the buildup of urge during blink suppression. The right ventrolateral prefrontal cortex findings in conjunction with its known involvement in inhibitory control suggest a role for this structure in maintaining volitional suppression of an increasing sense of urge. The consistency of our urge model findings with prior studies investigating the suppression of blinking and other bodily urges, thoughts, and behaviors suggests that a similar investigative approach may have utility in fMRI studies of disorders associated with abnormal urge suppression such as Tourette syndrome and obsessive-compulsive disorder. |
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Keywords: | ACC anterior cingulate cortex AFNI Analysis of Functional NeuroImages software BOLD blood oxygen level dependent DLPFC dorsolateral prefrontal cortex EOG electrooculography EPI echo planar imaging fMRI functional MRI GLM general linear model IFG inferior frontal gyrus IPL inferior parietal lobe MeFG medial frontal gyrus MFG middle frontal gyrus MOG middle occipital gyrus MPRAGE magnetization-prepared rapid acquisition gradient echo MTG middle temporal gyrus PET positron emission tomography SMA supplementary motor area STG superior temporal gyrus VLPFC ventrolateral prefrontal cortex |
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