An interface system capable of minimizing an electro magnetic interference. The elements may be filtered according to importance to the user, based on user-specified importance of each element, the number and type of past interactions with the elements, and the like. The system can also include position sensors to determine and transmit an athlete’s precise location on a playing field or court. The players carry out the play of the game in a manner similar to that of poker, playing for a poker outcome using the poker values, as well as a scoring outcome using the sports scoring indicia on the cards accumulated in the player’s hand. The shoulder pad unit includes a shoulder pad connected to the seat belt, and a connecting strap interconnecting the shoulder pad and the headrest. The neural stimulation system is capable of delivering neural stimulation pulses for sympathetic excitation, sympathetic inhibition, parasympathetic excitation, and parasympathetic inhibition.