A device for controlling equipment includes at least one light projector adapted
to project light onto a head of a living body. A light collecting section for collecting
the light having passed through the head, a light measuring section for measuring
an intensity of the light collected by the light collecting section, a memory section
for storing a previous history of changes of the intensity of the light measured,
a signal judging section for judging if both the intensity of the light measured
by said light measuring section and the previous history of changes of the intensity
of the light satisfy a predetermined condition, a displaying section for displaying
the intensity of the light measured and a result obtained by the signal judging
section, and a control signal generating section for generating a control signal
for external equipment.
