Sensory Testing of Multiple Forms of Spinal Cord Stimulation for Pain

Inclusion criteria: * Chronic intractable pain of the trunk and/or limbs * Undergoing SCS as part of standard clinical care for chronic pain management * Candidates will have been implanted with a commercial SCS device * Candidates who are 18 years or older and can speak, read, and understand English * Able to understand study procedures and to comply with them for the entire length of the study * Must be willing to participate in COVID-19 symptom screening and answer questions about COVID-19 diagnosis 1-3 days before a scheduled visit * Must be willing to wear a face-covering during all study visits Exclusion criteria: * Subjects who are pregnant or nursing * Subjects with current, habitual, or previous use within the last 12 months of artificial nails, nail enhancements, or nail extensions that cover any portion of either thumbnail * Subjects who are unable or unwilling to cooperate with clinical testing * Subjects having any impairment, activity or situation that in the judgment of study personnel would prevent satisfactory completion of the study protocol * Inability or unwillingness of individual or legal guardian/representative to give written informed consent * Subjects who currently have or tested positive in the last 14 days for COVID-19, or are symptomatic for COVID-19