OMG, well, a Princeton Neuroscience Institute study called The Brain Adapts to Dishonesty is giving us MAAAJOR trust issues.
According to the study, when people are repeatedly being dishonest to their partners (a.k.a. when they're cheating on their babes), they will no longer feel any guilt about it at all. Apparently, every single time a person lies, they will feel less and less guilty over time. (via EliteDaily.com)
The reason? The amygdala creates a response every time the person lies, but according to them, this response weakens when the person lies repeatedly. Oh no! According to the study's co-author and researcher Neil Garrett, it has yet to be tested on relationships specifically but he also says that something similar may apply.
"The idea would be the first time we commit adultery we feel bad about it. But the next time we feel less bad and so on, with the result that we can commit adultery to a greater extent," he explained.
He also added, "What our study and others suggest is a powerful factor that prevents us from cheating is our emotional reaction to it, how bad we feel essentially, and the process of adaptation reduces this reaction, thereby allowing us to cheat more. With serial cheaters, it could be the case that they initially felt bad about cheating, but have cheated so much they've adapted to their ways and simply don't feel bad about cheating any more."
Basically, the more we lie on someone about something, the less we feel guilty about it. Yikes!