Mouse facial thermal operant assay. (A) Reward licking contacts (upper trace) and facial thermode stimulus contacts (lower trace) acquired in a typical 20 min test session at 37°C. (B) Example of a hairless SKH1-Hrhr mouse completing the task by contacting the thermode (left) while simultaneously licking from the reward bottle (right).
Neubert et al. Molecular Pain 2008 4:43 doi:10.1186/1744-8069-4-43