An electronic timing system is provided for timing of athletic events including a radio-frequency identification antenna, a portable timing controller, a remote server, and a radio-frequency identification timing tag. The spatially adaptive microcontact structure is characterized in particular in that an optimum contact or active connection to nerve tissue is ensured. Also disclosed are a method of producing a group-III nitride semiconductor layer, a method of producing a group-III nitride semiconductor light-emitting device, and a lamp thereof.