285 – Identifying Stimulation Threshold

This Application Note details various protocols for identifying a stimulation threshold for stimulation. The purpose of establishing this threshold is to ensure the subject’s comfort level and safely determine the point at which a stimulation signal becomes unpleasant, or even painful. This is accomplished by sending a series of very short stimulus pulses to the subject and gradually increasing the voltage. The subject then indicates his or her level of comfort or discomfort, and the stimulation is adjusted accordingly.

Case 1: MP150 + UIM100C + STM100C + STMISOLA (current and voltage mode) or STMISOC/D/E (voltage mode only) + LEAD110A x2 + EL509 + GEL104
Case 1a: MP160 + HLT100C + STM100C + STMISOLA or STMISOC/D/E + LEAD110A x2 + EL509 + GEL104

Case 2a: MP150 + UIM100C + STM200 + LEAD110A x2 + EL509 + GEL104
Case 2b: 3rd-party hardware and software + STM200 + LEAD110A x2 + EL509 + GEL104

Case 3: E-Prime (Eprime) + STMISOLA or STMISOC + LEAD110A x2 + EL509 + GEL104

Case 4: 3rd-party application + STMISOLA or [STMISOC + STM100C + IPS100C + HLT100C + INISO] + LEAD110A x2 + EL509 + GEL104

Case 5: MP150 + STM100C + STMISOC (in current mode) + LEAD110A x2 + EL509 + GEL104

Case 6: Third party equipment + STP100C + IPS100C + STM100C + STMISOC (in current mode) + LEAD110A x2 + EL509 + GEL104

Case 7: 3rd-party equipment + MP150/IPS100C + STP100C + STM100C + STMISOC (in voltage mode) or STMISOLA + LEAD110A x2 + EL509 + GEL104

Associated Applications

• ERS: Evoked Response - Record evoked, late, and field potentials, as well as startle and nerve conduction. Powerful on- and off-line averaging features (P300), and dual stimulation ability with the MP150.
• Psychophysiology - Record and analyze BP, ECG, HRV, EDA, EMG, EEG, EOG, RSP, etc. Interface to stimulus presentation programs...use automated analysis routines to easily score and analyze data.
• Stim-Response | Virtual Reality - Synchronize events from a virtual world with physiological data from an MP150 system. Use feedback loops for greater control and automation—change the VR world in real time.