The disclosure provides a system (100) for treating a medical condition. The system (100) is configured to provide an enhanced vagal evoked potential (eVEP) in a patient's brain. The system comprises at least one electrode (125) and an implantable device. The at least one electrode is couplable to at least one cranial nerve (127) of a patient. The implantable device is operatively coupled to the at least one electrode and comprises an electrical signal generator (110). The electrical signal generator is configured to generate an electrical signal comprising a plurality of microbursts, where adjacent microbursts are separated by an interburst interval, and each microburst comprises a plurality of pulses, where adjacent pulses are separated by an interpulse interval, and each microburst defines a microburst duration which is a length of time from a beginning of a first pulse to an end of a last pulse. Furthermore, the system is configured to determine the interburst period for a particular patient by providing microbursts separated by increasingly smaller interburst periods until the eVEP begins to diminish or disappear.
