Often, the term "consciousness" is being used as a unary predicate, i.e. it is a predicate that takes one "variable". This variable often describes organisms, persons, subjects or the like.
''Example:'' Consciousness in this sense could refer to whether a person is in a state of [[consciousness#wakefullness|wakefulness, capable of processing and reacting to stimuli]].
== Unary predicate of mental states ==