PixyMisa
Persnickety Insect
Yep.I think that's beyond our capability right now. Possibly in the future it will be public behavior. Subvocal speech is another area of interest, since much of what we call thinking involves talking to ourselves.
I'm not saying that right now we can tell when you are mentally picturing your dog, just that we have tools that can give us insight into the processes involved, that it's not in principle an unapproachable problem.