When brain implants arrive, will we still be “us”?

When brain implants arrive, will we still be “us”?

What happens when non-biological implants in our bodies — along the lines of cochlear implants to improve hearing in the deaf — include brain-related devices that might enhance our memories? Will we still be “us”? Will we be more of a cyborg than we were if, say, we had another type of implant? And for those who believe we would not be, at what point do we lose our selves to a more machine-like incarnation? When do we stop being human?