Horizon Sham Adaptor: Unlocking the Potential of Dual-Functionality of Single TMS Coil for Real and Sham Stimulations

A bstract This paper introduces a new figure-of-eight TMS coil design capable of delivering both real and sham TMS stimulation using a single coil. The design, emitted clicking noise, and induced tactile sensation provide no discernible indication of whether it is in the real or sham state, making it suitable for double-blind studies. This coil family comprises the E-z Cool Coil and Air Film Coil (AFC) and is compatible with Magstim Horizon stimulators. This single-coil TMS setup enables the administration of either real or sham protocols without requiring coil replacement or physical repositioning. The transition between these states is achieved simply by replacing the adaptor between the coil connector and the TMS device.