For example, psychophysics has shown that percepts for different properties are realized asynchronously. Such cues involve percepts such as pitch. MaxDiff may involve multidimensional percepts, unlike most-least models that assume a unidimensional representation. Examples include thoughts, concepts, memories, emotions, percepts and intentions. But then it cannot validate the claim that percepts are subjective. Finally, the two percepts will alternate back and forth in terms of visual awareness. But physiology and psychology are based on these percepts. As aforementioned the two percepts are never experienced simultaneously. It is restricted to maximizing rewards based on percepts as opposed to external states. Another game, "Percepts", was available for free to players that sent in a survey card.