luxarific said:
There was that one log you find in a lab in GovSector, saying that smart people see plans (forget the exact terminology), and everyone else goes crazy. Issac is smart and Stross, as seen in Aftermath, is also (Lexine struck me as a bit of a dumb damsel in distress in Extraction, but that's just my opinion). Presumably Ellie is also smart; she doesn't seem to be experiencing any negative effects from the marker at all.
The thing about Ellie is we don't see any effect from the Marker on her at all. No headaches, no visions, nothing. Those "smart" characters see plans and whatnot, but they're certainly not lacking in hallucinations and other crazy effects. They're not
not effected.
I'm also not sure Lexine was special in the same ways that Isaac, Stross, Altman, etc. were. She gets physically ill, but again there's no big indication that she encounters any other Marker effects.
I find it hard to draw any conclusions about these patterns when if you really think about it, several characters don't seem particularly effected by the Markers. Dead Space's universe and mythology are supremely fascinating, but also damned confusing.