Systems and methods for applying and/or receiving electrical, magnetic, magnetoelectric, vibratory, or electromagnetic signals to biological tissues are described. In some embodiments, one or more of a body, a conductor, an electrode, and a magnetic element may be provided. The conductor may be configured to be electrically coupled to at least one of a power source and a detector. The electrode may include a surface configured to contact a biological tissue portion and apply and/or receive an electrical signal to and/or from the biological tissue portion. The magnetic may selected from a group consisting of a magnet, a toroid, a conductive coil, a magnetic powder, and a magnetic fluid.