Article

Anticipatory brainstem activity predicts neural processing of pain in humans

Department of Physiology, Anatomy and Genetics, Department of Clinical Neurology, University of Oxford, Oxford OX1 3QX, United Kingdom.
Pain (Impact Factor: 5.21). 04/2007; 128(1-2):101-10. DOI: 10.1016/j.pain.2006.09.001
Source: PubMed

ABSTRACT

Previous neuroimaging studies have shown brain activity during not only the application of noxious stimuli, but also prior to stimulation. The functional significance of the anticipatory response, however, has yet to be explored. Two theoretical responses involve either a decrease or an increase in sensitivity of the nociceptive system. In a functional magnetic resonance imaging (fMRI) study, brainstem responses during anticipation and processing of thermal noxious stimuli were investigated. Twelve healthy subjects were warned prior to and then received noxious stimulation to their left hand. Behavioral data showed a positive correlation between the intensity of anticipation and pain. FMRI data revealed brainstem activation in the PAG during the anticipation period. When correlated with individual anticipation ratings, activation during anticipation included significant clusters within the entorhinal cortex and ventral tegmental area (VTA). During receipt, activation within the brainstem included the PAG, VTA, rostral ventromedial medulla (RVM), and the parabrachial nucleus (PB), all elements of descending pain pathways. Using a backward model approach, we explored the functional significance of the anticipatory neural response for subsequent pain processing. Results of this regression analysis revealed that insula activity during receipt was predicted by activity in both the entorhinal cortex and VTA during anticipation. We suggest that activation in both regions before and during pain may underlie anticipation and subsequent pain modulatory responses, possibly involving the appraisal and control of attention necessary for pain modulation. Together, the results suggest a possible role of brainstem areas in anticipatory mechanisms involved in the maintenance of chronic pain.

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    • "Porro et al., 2002). Crucially, the expectation of high pain intensity would induce increased activation in contralateral S1, bilateral ACC, medial prefrontal cortex, and anterior insula, together with higher subjective pain intensity (Fairhurst et al., 2007; Keltner et al., 2006; Koyama et al., 2005; Porro et al., 2002). In contrast, the expectation of low-but application of high-level intensity of noxious stimulus was reflected as less activation within brain areas related to pain processing. "
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    ABSTRACT: Suppression of spontaneous alpha oscillatory activities, interpreted as cortical excitability, was observed in response to both transient and tonic painful stimuli. The changes of alpha rhythms induced by pain could be modulated by painful sensory inputs, experimental tasks, and top-down cognitive regulations such as attention. The temporal and spatial characteristics, as well as neural functions of pain induced alpha responses, depend much on how these factors contribute to the observed alpha event-related desynchronization/synchronization (ERD/ERS). How sensory-, task-, and cognitive- related changes of alpha oscillatory activities interact in pain perception process is reviewed in the current study, and the following conclusions were made: (1) the functional inhibition hypothesis that has been proposed in auditory and visual modalities could be applied also in pain modality; (2) the neural functions of pain induced alpha ERD/ERS were highly dependent on the cortical regions where it was observed, e.g., somatosensory cortex alpha ERD/ERS in pain perception for painful stimulus processing; (3) the attention modulation of pain perception, i.e., influences on the sensory and affective dimensions of pain experience, could be mediated by changes of alpha rhythms. Finally, we proposed a model regarding the determinants of pain related alpha oscillatory activity, i.e., sensory-discriminative, affective-motivational, and cognitive-modulative aspects of pain experience, would affect and determine pain related alpha oscillatory activities in an integrated way within the distributed alpha system. Copyright © 2015. Published by Elsevier B.V.
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    • "This finding corroborates previous studies that have reported decreased nociceptive processing when fasting (Davidson et al. 1992; de los Santos-Arteaga et al. 2003; McGivern et al. 1979; McGivern and Berntson 1980). A contribution by parahippocampal cortex (or very closely related areas) to evoked pain responses has been postulated previously in EEG source analysis studies (Stancak et al. 2013; Stancak and Fallon 2013; Valeriani et al. 1996, 2000, 2002), and experiments with fMRI have cited PHG as being involved in processes such as reactivating memories of pain (Kattoor et al. 2013), pain anticipation (Fairhurst et al. 2007), and pain sensitivity (Piche et al. 2010). Interestingly, in the present study the effects of session on PHG activation were not correlated with pain ratings but rather with ratings of food photograph hedonicity. "
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    Full-text · Article · Dec 2014 · Journal of Neurophysiology
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    • "Their coordinates were based on previous studies. We specified the sgACC (x = 0, y = 22, z = −6) (Fairhurst et al., 2007) and PAG (left: x = − 2, y = -28, z = − 8; right: x = 3, y = -28, z = − 6) (Yoshida et al., 2013). In each ROI, the peak value per subject and per contrast was obtained with a homemade Matlab program. "
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    ABSTRACT: The human brain responds both before and during the application of aversive stimuli. Anticipation allows the organism to prepare its nociceptive system to respond adequately to the subsequent stimulus. The context in which an uncomfortable stimulus is experienced may also influence neural processing. Uncertainty of occurrence, timing and intensity of an aversive event may lead to increased anticipatory anxiety, fear, physiological arousal and sensory perception. We aimed to identify, in healthy volunteers, the effects of uncertainty in the anticipation of uncomfortable rectal distension, and the impact of the autonomic nervous system (ANS) activity and anxiety-related psychological variables on neural mechanisms of anticipation of rectal distension using fMRI. Barostat-controlled uncomfortable rectal distensions were preceded by cued uncertain or certain anticipation in 15 healthy volunteers in a fMRI protocol at 3T. Electrocardiographic data were concurrently registered by MR scanner. The low frequency (LF)-component of the heart rate variability (HRV) time-series was extracted and inserted as a regressor in the fMRI model ('LF-HRV model'). The impact of ANS activity was analyzed by comparing the fMRI signal in the 'standard model' and in the 'LF-HRV model' across the different anticipation and distension conditions. The scores of the psychological questionnaires and the rating of perceived anticipatory anxiety were included as covariates in the fMRI data analysis. Our experiments led to the following key findings: 1) the subgenual anterior cingulate cortex (sgACC) is the only activation site that relates to uncertainty in healthy volunteers and is directly correlated to individual questionnaire score for pain-related anxiety; 2) uncertain anticipation of rectal distension involved several relevant brain regions, namely activation of sgACC and medial prefrontal cortex and deactivation of amygdala, insula, thalamus, secondary somatosensory cortex, supplementary motor area and cerebellum; 3) most of the brain activity during anticipation, but not distension, is associated with activity of the central autonomic network. This approach could be applied to study the ANS impact on brain activity in various pathological conditions, namely in patients with chronic digestive conditions characterized by visceral discomfort and ANS imbalance such as irritable bowel syndrome or inflammatory bowel diseases. Copyright © 2014 Elsevier Inc. All rights reserved.
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