I don't know if it's necessary to even invoke hormones for this (it may be true, I'm not sure), you can also view confirmation bias as simply more efficient. I

I don't know if it's necessary to even invoke hormones for this (it may be true, I'm not sure), you can also view confirmation bias as simply more efficient. It requires less mental energy to slot new information into an existing framework of beliefs than to consider alternative ways for the information to fit. We don't question our entire belief system with every new piece of information; that would be mentally exhausting.