Okay, if we're not ruling things out, we have to determine why that level of tampering happened. Every answer seems to lend itself to us being watched still. Why would they erase months of Murphy and Bellamy's memories? [A beat, slow, steady. She doesn't like the next thought the occurs to her. Clarke's steps slow as she closes her eyes with the realization.] Unless whatever it is that they used to keep us from remembering that time has side effects. Some people have experienced further ... damage.

[Like a concussion, but lasting. Clarke had ruled out potential trauma and psychological effects with her friends, only because she feels that they'd already have shown signs of that. They've been sent to a "different world," so to speak, and told to survive. That's the strange part of this, how they're both prepared and ill prepared.]

I'm not even sure if there's a way to test for that. If there's some past trauma to the brain? [It seems like it could be possible, if they're including the possibility of erasing time from someone's mind. That's seemingly impossible on its own.]