Infrared (IR) inhibition can induce selective heat block on small-diameter axons. We hypothesize that the selective IR inhibition effect can be reproduced by resistance heating via a heating cuff. We tested the hypothesis in vitro on the pleural-abdominal connective of Aplysia californica. The IR optical fiber, heating cuff, and a thermocouple were co-located to ensure both heating modalities induced a similar temperature increase on the nerve. Electrically stimulated compound action potentials were recorded and segmented to characterize the inhibition effect on different axonal subgroups. The dose-response curve showed that resistance heating can reproduce the selective IR inhibition effect.
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