We are used to seeing creatures such as The Terminator, a 'cyborg' hybrid of flesh and machinery on television, but these creatures may be roaming around us in the near future.
In an astonishing and controversial scientific breakthrough, faulty parts of living brains have been replaced by electronic chips.
It is the work of researchers at Tel Aviv University who have successfully created circuits that can replace motor functions - such as blinking - and implanted them into brains.
"Imagine there's a small area in the brain that is malfunctioning, and imagine that we understand the architecture of this damaged area. So we try to replicate this part of the brain with electronics," Professor Matti Mintz, a psychobiologist, told BBC.
Mintz has already successfully implanted a robotic cerebellum into the skull of a rodent with brain damage, restoring its capacity for movement.
The cerebellum is responsible for co-ordinating movement, explained Mintz.
When wired to the brain, his 'robo-cerebellum' receives, interprets, and transmits sensory information from the brain stem, facilitating communication between the brain and the body.
To test this robotic interface between body and brain, the researchers taught a brain-damaged rat to blink whenever they sounded a particular tone.
The rat could only perform the behaviour when its robotic cerebellum was functional.
According to the researcher, the chip is designed to mimic natural neuronal activity.
"It's a proof of the concept that we can record information from the brain, analyze it in a way similar to the biological network, and then return it to the brain," stated Prof. Mintz who presented the research at the Strategies for Engineered Negligible Senescence meeting in Cambridge, UK.
In the future, this robo-cerebellum could lead to electronic implants that replace damaged tissues in the human brain.
However, anti-vivisection campaigners have described the experiments as 'grotesque'.
"This type of research raises enormous ethical concerns, let alone the poor animals whose lives are wasted on dubious and ego-driven experiments," Jan Creamer, CEO of the National Anti-Vivisection Society told BBC.