"Because she thinks she can't be happy. Doesn't mean she's right about herself."

"Logic tells her that, being a machine, she cannot logically feel happy.
But contrary to this, she can feel happy, she just doesn't recognise it as such."

"I'm pretty sure she said it in a way that's like screw you John, you think I'm a souless machine, so there you go, I"m a machine, I can't be happy. But that's just me, I thought this from the very first time I heard her say it."

"The mistake is to believe that there is an Allison program which is normally not present. A much more realistic model from a computer perspective is that Allison is running all the time but the influence on her behavior is controlled by a learning mechanism. That way both the Allison subsystem can evolve as will the non Allison subsytems over time and Camerons overall behavior will also evovle. "

"I'm convinced that even Cameron doesn't know everything about herself. She knows all about her abilities and programing that she needs to know, all that will help her accomplish her mission. There may be some buried abilities or programming that she doesn't know about after she was wiped.

I find it pretty shrewd of the writers that while they showed Cameron as Allison crying, having fun, and being distressed, but not eating or filling any other human needs. Food was just interrupted by the jerk, and the other needs, well, we can go several hours without having to fly the porcelain fighter-jet. "

"Computers often run systems in parallel . Thus Cameron has a system governed by emotions based on Allison and other systems which are not. Actual behavior may weight outputs from these different systems and may vary over time . Cameron already stated she has human sensory capability and the feedback from that may create a human lke sentience in the Allision system . However the strength of the emotional experience may be controlled by yet another system .
If we take the I love you and you love me John sequence it may be the result of the control system ramping up the emotional Allison component to the maximum . In any case it worked since John did not destroy Cameron. "