Extraterrestrial writing or schizophrenic renderings?

This site provides examples of alleged alien symbols and writing captured mentally by abductees and/or persons who say they’ve been in contact with UFOs and their entities:

http://www.abduct.com/symbols/s20.php

Here are two examples, a star chart and an indication of an alien alphabet:

The linked site has many others, some not unlike the Uruk example of writing or symbols (circa 8000 B.C.) which you can read about at Wikipedia:

http://en.wikipedia.org/wiki/Writing

Again, do such representations come from an alien source or mental representations from those with neurological or psychological quirks?

It seems to me that any example of extraterrestrial writing would have some consistency with this categories of writing, as found in the Wikipedia article:

A logogram is a written character which represents a word or morpheme

A syllabary is a set of written symbols that represent (or approximate) syllables

In all the examples of abductee or UFO remembrances (at the site noted) one does not find a “logic” as one might discover in a philological study:

http://en.wikipedia.org/wiki/Philology

What causes people to thrust these outbursts into the UFO ether, mental derangement or an actual belief that they captured alien writing?

George Adamski provided such scribblings in his representation of Orthon’s shoe imprint:

 And then we have Lonnie Zamora’s drawing of the insignia he saw on the egg-shaped craft he spotted in Socorro, 1964. (Oh wait, that’s a logo on a Hughes Aicraft test vehicle):

RR

http://ufocon.blogspot.com – The UFO Iconoclast(s)