Individuals imprint on those factors, and at some point, usually at puberty, the imprintings undergo what is called "maturation lock down," a process that also locks out other frames of reference and awareness parameters. One of the subtle problems involved, however, is that awareness parameters are usually formatted along the lines of some lowest common denominators that are most sharable within the majority. After that, any experienced awareness that is not consistent with the common denominators is considered to be unusual or worse, because it tends to "threaten" the presumed certainty of the common denominators. It is thus that most do not like to consider the possible validity of awareness parameters that are either different or larger than their own. * It can be said that forms of PSI, including, for example, remote viewing and telepathy, experientially involve parameters of awareness that are not consistent with those that are appropriate to and efficient within the realms of physicality. During the nineteenth and twentieth centuries of the modern West, those realms were culturally grouped together within the frames of reference governing philosophical and scientific materialism. Philosophical materialism, even if sounding elegant, was always something of a mentalistic quagmire. Even so, scientific materialism became very apt and successful with regard to examining physicality, both directly in substance and indirectly via mathematics.