If you have read my previous posts on this blog you might recall my opinion that most ways of creating a full brain emulation would not result in immortality for the original, but Roko Mijic's talk on FAI made me think about how uploading may benefit humanity in other ways. Roko mentions and even recommends using brain emulations as a stepping stone towards benevolent superintelligence, but there might be less fantastical uses for the technology if it is developed before the Singularity drives humanity into extinction.
The appeal of using brain emulations for AI is obvious, with an AI made from scratch you don't really know what to expect. Whereas an emulation theoretically gives you something with motivations you understand, or at least an easy way to teach an AI human values. Also you can easily monitor every process of an emulation, which is where I got my idea.
There are many mysteries still locked within the human mind and even if decent mind reading technology is developed it would be difficult for one to provide data on everyday activities with a brain scanner around their head. That is where uploading comes in, remember, you don't necessarily need to understand how something works to copy it. No doubt there are many psychologists who would love to pick around in someone's head to the extent that only an emulation could provide. Not to mention that an emulation of a psychopath or schizophrenic would help AI programmers recognize what not to do.