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The P300 in pain evoked potentials
R Zaslansky1, E Sprecher, E C Tenke
1Technion Medical School, Rambam Medical Center,Haifa,Israel Department of Neurology, Rambam Medical Center,Haifa,Israel Department of Biopsychology, New York State Psychiatric Institute,New York, NY 10032,USA.
Pain
|July 1, 1996
Summary
Pain evoked potentials (EPs) are not purely objective pain measures. Research indicates laser EPs contain a significant P300 component, influenced by attention and stimulus frequency, not just pain intensity.
Area of Science:
- Neuroscience
- Pain Research
- Psychophysiology
Background:
- Pain evoked potentials (EPs) are utilized for objective pain measurement in clinical and experimental settings.
- The neurophysiological basis of EPs, specifically whether they reflect pain or endogenous potentials like P300, remains debated.
Purpose of the Study:
- To investigate the influence of non-modality-specific factors on laser-evoked potentials (EPs).
- To determine the extent to which laser EPs are affected by attention and P300-related paradigms.
Main Methods:
- Two experiments were conducted on 10 healthy volunteers using CO2 laser stimuli on the radial hand.
- Experiment 1: Compared stimulus-attend versus stimulus-ignore conditions.
- Experiment 2: Employed counterbalanced oddball and task P300 stimulus presentations to analyze separate and combined influences.
Main Results:
- The positive component of laser EPs was significantly affected by attention manipulations (P = 0.0146).
- Stimulus frequency conditions within the P300 paradigm also significantly impacted laser EPs (P = 0.003).
- Task conditions alone did not affect the positive wave, but showed an interaction with frequency (P = 0.033).
Conclusions:
- Laser EPs are not a pure measure of pain intensity.
- A distinct non-modality-specific P300 component is present in laser EPs.
- While a somatic component may exist, attention and cognitive factors significantly modulate laser EPs.