An extended electrode is electrically connected to a conductor in a portion outside of an inner wall of a protection member disposed on a photoconductive layer side, the pressure applied to the photoconductive layer is reduced and the deterioration of the photoconductive layer may be suppressed. Traditionally, pluripotent stem cells are cultured on a layer of feeder cells to prevent them from differentiating. Reliable identification and correlation of signal components are derived by analysis of the acquired composite signals that uses time-of-arrival of a known part of a signal. The apparatus provides a mechanism for dealing with detected conflict by blocking transmission of, or response to, a measurement control message giving rise to conflict.