Two major types of NIBS techniques are currently in use on humans for clinical and research applications: Transcranial Magnetic Stimulation (TMS) and Transcranial Current Stimulation (tCS) [12]. TMS uses a varying magnetic field to induce weak electric currents in the brain. It can be delivered as a single pulse or as a train of pulses. Single-pulse TMS is typically used to study brain physiology and plasticity [3, 13-16], whereas repetitive-pulse TMS (rTMS) is commonly used to elicit neuromodulation and neuroplasticity, and can result in prolonged excitability changes that outlast the stimulation period [6, 15]. Typically, the direction of neuromodulation is driven by the frequency at which the stimulation is performed, such that high-frequency rTMS increases cortical excitability and low-frequency rTMS decreases cortical excitability [17]. However, theta burst stimulation (a variation of high frequency rTMS) can induce either depression or facilitation of cortical excitability, depending on burst-train duration, such that intermittent theta burst stimulation increases cortical excitability and continuous theta burst stimulation decreases cortical excitability [18].