Abstract
The aim of this study was to identify EEG changes induced by Aδ-nociceptor activation in single trials. In a preliminary experiment, intense CO 2 laser stimuli were delivered to the hand dorsum of five volunteers. The average amplitude of EEG epochs was estimated in the time-frequency (TF) domain using the continuous Morlet wavelet transform (CMT). The result was used as a TF filter enhancing Aδ-nociceptor induced EEG responses. In a second experiment, eight other subjects were delivered laser stimuli with six intensities. The CMT of each EEG epoch was computed. After applying the TF filter, amplitudes within a predefined interval were summed. Whether this sum predicted the occurrence of Aδ-nociceptor activation was tested using the reaction-time to discriminate between Aδ- or C-fibre mediated detection. Results showed that this method accurately identified single-trial EEG responses to Aδ-nociceptor activation.
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