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Ploghaus, Alexander; Narain, Charvy; Beckmann, Christian F.; Clare, Stuart; Bantick, Susanna; Wise, Richard Geoffrey; Matthews, Paul M.; Rawlins, J. Nicholas P.; Tracey, Irene (2001)
Publisher: Society for Neuroscience
Languages: English
Types: Article
It is common clinical experience that anxiety about pain can\ud exacerbate the pain sensation. Using event-related functional\ud magnetic resonance imaging (FMRI), we compared activation\ud responses to noxious thermal stimulation while perceived pain\ud intensity was manipulated by changes in either physical intensity\ud or induced anxiety. One visual signal, which reliably predicted\ud noxious stimulation of moderate intensity, came to\ud evoke low anxiety about the impending pain. Another visual\ud signal was followed by the same, moderate-intensity stimulation\ud on most of the trials, but occasionally by discriminably\ud stronger noxious stimuli, and came to evoke higher anxiety. We\ud found that the entorhinal cortex of the hippocampal formation\ud responded differentially to identical noxious stimuli, dependent\ud on whether the perceived pain intensity was enhanced by\ud pain-relevant anxiety. During this emotional pain modulation,\ud entorhinal responses predicted activity in closely connected,\ud affective (perigenual cingulate), and intensity coding (midinsula)\ud areas. Our finding suggests that accurate preparatory\ud information during medical and dental procedures alleviates\ud pain by disengaging the hippocampus. It supports the proposal\ud that during anxiety, the hippocampal formation amplifies aversive\ud events to prime behavioral responses that are adaptive to\ud the worst possible outcome.
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