Does A Body Good?

Researchers are experimenting with deep brain stimulation (DBS) to counter depression. According to CNN, "From the cerebral cortex, wires are tunneled behind the ear into the chest, where there's a power source for the electrodes that emit electrical impulses into the brain."

For now at least, this would not be used on people with only occasional and mild depression. Currently, this is only for people whose problem is not just severe but life-threatening - people for whom all other treatment (psychotherapy, drug therapy, and electroconvulsive therapy) has failed. But the possibility of this type of treatment does raise an interesting question about where we are heading.

In future, will each human body be tweaked with mechanical devices for better physical and mental performance? If so, what percentage will be mechanical? Will we even need a biological body?