In this study we intend to sample the ECG from two groups. The first group will comprise of 20 healthy young adults who voluntarily will be inflicted by thermal, pressure and neural stimuli pain using the TSA 2000, (this study is to be authorized by the Soroka University Medical Center IRB Committee); these subjects will be VAS and ECG monitored before, during and after the thermal pain induction. It is important to state that this instrument inflicts thermal pain by an authorized protocol, which does not harm or produce any tissue damage.