Given that the entirety of reality is determined by the percipient, all concepts that have been developed by that percipient are all he knows to be true. 

In this manner, time and space are merely products of ones reason, only being allocated into existence through the experience of the percipient, for without a sentient being capable of analysis, these concepts may or may not exist. The presence of a concept is only realized through experienced. Ultimately, all epistemology and sense of being and existence is determined by the percipient. Without that faculty of cognition, nothing can be sufficiently substantiated.

Things like pedophilia, homosexuality, and I would even go so far as to say autism are cognitive phantasms erected(no pun intended) by the percipient's faculty of cognition.

Objectively, there may be incongruity to the neurological structure of a "normal" human to that of one with autism, yet the brain is the nucleus for all conceptualization and ontological consciousness, ergo it is possible for one to induce a reality or another form of solipsistic phantasm that obfuscates them apart from the "normal" perception. PTSD is a phantasm, one that is treated through therapy.

Hence, there is no possible way to define normality, due to the lack of knowledge that you exist in a solipsistic phantasm.