The antonym of the word “extrospheral” is the adjective “introspheral”.
The adjective “extrospheral” was defined as part of the terminology of the “Digital Era Framework”. Among other things, the “Digital Era Framework” serves as a reference framework for systematizing the way information manifests itself. Four spheres can be distinguished: The infosphere, which consists of the analog infosphere and the digital infosphere, and further the cognisphere and the entisphere. When one of these spheres is considered, the adjective “extrospheral” emphasizes that something is directed from the inside out with regard to this sphere.