Yeah.

[Frowning, Clara tries not to let it show just how unsettling she thinks it is.]

The fact they're able to mess with our minds at all means we aren't sure what's real and what isn't, as far as our memories of things are concerned.

[Which doesn't do much for the mental stress she's been under as of late, but her focus stays on attempting to discuss written and spoken language and not her own distress.]