Posthumanismtranshumanism, is the belief, study, or promotion of the idea that the human form is self-limiting. Posthumanists seek to get beyond the natural bounds of the body. Posthumanists promote artificial intelligence, nanotechnology, biomachines, and other technologies whose goal it is to blur the distinction between humans and machines.
According to [another definition], a posthuman is what a transhuman seeks to become. Posthumans are 'Persons of unprecedented physical, intellectual, and psychological capacity, self-programming, self-constituting, potentially immortal, unlimited individuals.'
There is also the theory that the human brain can be biologically altered to use its perceived potential. At best, the actual cognitive functioning of the brain is limited. Bioengineers will attempt to utilize all of the 'grey matter'.