Abstract
Rate and fractal dimension D (spike train complexity) of spinal dorsal horn neuronal discharges were evaluated during background, receptive field (RFS) and/or heterotopic (HNS) noxious stimulation. Background D was 1.4921 ± 0.0325 (mean±SEM). RFS induced in 86% of neurons an increase of DR, and in 79 % of these a concomitant decrease of D. HNS reduced background DR in 52-71 % of neurons and increased D in 53-58 % of neurons. These coincidence occurred in 28-54 % of neurons. HNS induced decrease of DR in 50-67 % of neurons and increase in D in 38-58 % of neurons in evoked responses to RFS. Decrease of DR and increase of D were associated in 29-35 % of the neurons. DR and D could also covary in the same direction, suggesting that DR and D are separate parameters and that both could be taken into account when analyzing sensory coding strategies.
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