Extremely

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As extramental ( Latin. Extra , "apart from, outside" and mens , "spirit, understanding, reason"), in the figurative sense sometimes also extracranial (from Latin cranium , "skull"), areas of reality are understood which and how they exist outside and independently of a conscious observer. Accordingly, this includes both the actual causes (the thing in itself ) of all sensory impressions that manifest themselves in consciousness, as well as any areas and processes in the world that elude conscious observation (the proverbial back of the moon ), or are not perceived by any observer (e.g. the sound of a tree falling to the ground in a forest).

The assumption of extramental realms of being implies an ontological realism and is represented by the majority even today in the plausible, but not necessarily also intuitive form that these realms - in the sense of John Locke - can only be assigned primary properties , i.e. only those that are solely from their own physical occurrences result (pure quantities, such as movement , force , tension or mass ) and are described as such by physics . While secondary properties , i.e. qualities such as color , smell , or sound (as sensation), emerge only in the subjective experience of consciousness, are essentially dependent on this and have no equivalent outside of it, but only their causes.

The assumption of an extramental reality, however, is incompatible with most variants of idealism .