Differentiation of nociceptive - from stress-induced modulatory influences on human reflexes

Andrew G. Mason, Hilbert W. Van der Glas, Ross M. Jones, Samuel W. Cadden

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)


    This paper describes a new protocol that addresses the question of whether, in human experiments, modulatory effects of remote nociceptive conditioning stimuli on reflex responses are mediated by the stress induced by the conditioning stimuli. The protocol has been illustrated by a study into the effect of a remote nociceptive conditioning stimulus on an inhibitory jaw reflex. Electromyograms were recorded from an active masseter muscle and inhibitory reflexes were evoked by applying electrical stimuli to the upper lip. This protocol utilised the application of discrete electrical conditioning stimuli applied to the sural nerve prior to the test stimulus. A preliminary experiment determined that the optimal interval between the conditioning and test stimuli, which produced modulatory effects was 100 ms. In the definitive study, computer software was used to deliver control and conditioned sweeps in a double-blind randomised sequence. This resulted in a “stress-equal” protocol in which the level of stress would be the same for both control and conditioned sweeps. Therefore any observed modulatory effects on the reflexes could not have been wholly secondary to stress. This protocol could be adapted to the study of the modulation of other reflexes or evoked sensations by nociceptive conditioning stimuli.
    Original languageEnglish
    Pages (from-to)245-253
    Number of pages9
    JournalJournal of Neuroscience Methods
    Issue number1-2
    Publication statusPublished - 2005


    • Nociception
    • Reflex
    • Modulation
    • Inhibitory controls
    • Stress


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