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== Definition v1 ==Quality spaces are mathematical spaces that intend need to model "mental qualities". They should have some relation with be distinguished from [[qualia spaces]], presumably that though the latter precise relation is not yet clarified. A proposal would take be to conceive of qualia spaces as taking the specific characterizations or properties of [[qualia]] into account, whereas quality spaces only focus on refer to mental qualities as defined above. = Mental Qualities = Mental qualities are defined to be "the mental properties in virtue of which an individual can perform perceptual discriminations"<ref name="Rosenthal"/>. Several authors take the term 'mental quality' to be generally synonymous to [[qualia]] or [[phenomenal consciousness]], however it is agreed that the term mental qualities so defined could also refer to unconscious properties. Mental qualities are distinguished from perceptible qualities and physical stimuli presented to a subject. = Proposed Mathematical Structures = The elements of quality space represent ''mental qualities''. At least two different formal models have been proposed: == Standard Framework == In the standard framework, mental qualities are elements of a metric space, where the qualitative nature distance represents phenomenal similarity.<ref name="Rosenthal"/> == Regional Framework == The regional framework has been developed in order to overcome problems of conscious experiencethe standard framework.<ref>Lee, Andrew. "Modeling Mental Qualities". SupposedlyPhilosophical Review</ref> In the metric space of the standard framework, it identifies subsets of the metric space, thencalled ''regions'', quality spaces which are taken to represent mental qualities instead of the points of the metric space, thereby attempting to represent phenomenal property of ''precision''. A pseudo-metric is defined on the regions in dependence on the metric of the underlying metric space. = Epistemological Considerations = The metric space of the standard framework is constructed operationally by use of ''Just Noticeable Differences'' or ''Matching''. Since it is also special cases compatible with non-conscious perceptual discriminations, it stands to reason that this space is largely conceived of [[as epistemic or operational in nature. In contrast, the regional framework is more phenomenological in nature, representing conscious experience spaces]]mathematically.   == References ==<references />