Nociceptive C fibre input to the primary somatosensory cortex (SI). A field potential study in the rat
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Altered nociceptive C fibre input to primary somatosensory cortex in an animal model of hyperalgesia
2011, European Journal of PainCitation Excerpt :Fig. 1b shows the distribution of the recording sites used. To elicit C fibre evoked potentials, the glabrous skin of the right hind paw/forepaw areas were stimulated using a CO2 laser with a pulse duration of 21–33 ms. These stimulation energies have been shown to evoke late cortical field potentials reliably in the rat SI cortex through the activation of cutaneous nociceptive C fibres (Kalliomaki et al., 1993a,b). Based on previous latency measurements (Kalliomaki et al., 1993a) we here classify evoked potentials with an onset latency exceeding 120 ms and 180 ms for forepaw and hind paw, respectively, as C fibre evoked.
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