Experimental Brain Research

, Volume 87, Issue 2, pp 438–444 | Cite as

Habituation to repeated painful and non-painful cutaneous stimuli: a quantitative psychophysical study

  • R. J. Milne
  • N. E. Kay
  • R. J. Irwin
Article

Summary

Repeated stimuli elicit progressively smaller responses and elevated sensory and/or pain thresholds (habituation). The present experiments were designed to determine the rate of habituation of perceptual responses to supraliminal painful and non-painful cutaneous stimuli. Changes in the perceived intensity of electrical stimuli applied to the digital nerves of the index finger were determined by a matching procedure in which subjects set the current applied to the index finger of one hand to match the perceived intensity of a stimulus train (5 pulses at 20 Hz) applied to the other index finger. Twenty-five volunteers took part in 7 experiments in which both non-painful (2.5 times the sensory threshold Ts) and painful (1.2 times the pain threshold Tp) stimulus trains were presented. Subjects were required to match the stimuli at 30 s intervals over a period of 7.5 min. The percentage change in matching current (Y) was fitted by the function Y= -20.7*[1 -exp (-0.56*t)] for both painful and non-painful stimuli repeated at 2 Hz. Responses recovered completely within 2 min of cessation of the stimulation. The degree of habituation increased or decreased with the rate of stimulus presentation. These results did not depend on changes in afferent fibre recruitment or fatigue because the afferent volley on the median nerve remained constant throughout the period of stimulation. Thus perceptual responses to the perceived intensity of supraliminal painful and non-painful stimuli delivered to the index finger habituate to the same extent, and the extent of the habituation is a function of the frequency of presentation of the stimulus.

Key words

Cutaneous sensation Stimulus matching Habituation Pain Human 

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • R. J. Milne
    • 1
  • N. E. Kay
    • 1
  • R. J. Irwin
    • 2
  1. 1.Department of PhysiologyUniversity of AucklandNew Zealand
  2. 2.Department of PsychologyUniversity of AucklandNew Zealand

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