A robotic future holds the promise of providing tireless workers and companions for humans, but it can also evoke worries about an armed machine insurrection along the lines of the "Terminator" movies.

Experts consider that dark vision to be on the distant horizon, although they now point to other ethical issues that arise from the growing presence of battlefield bots and their potential to decide to attack autonomously, possibly as soon as in the next 20 years .

Most current military robots have human handlers, but some can pull the trigger on their own. The U.S. Navy and Army use anti-missile systems resembling R2-D2 toting a Gatling gun, which can go into full-automatic mode to track and shoot down incoming missiles. Israel and South Korea have deployed robotic sentries along their borders that may shoot first and ask questions later.

Such defensive systems could give way to robots that make attack decisions "within this century if not in the next decade or two," said Patrick Lin, a researcher at California State Polytechnic University who compiled a report for the U.S. Navy on the ethics and risks of military robots. And that raises questions of how to keep robots in line during confusing battlefield situations.

"Yes, a robot does not feel anger or revenge but neither does it feel empathy or compassion," said Noel Sharkey, a robotics expert at the University of Sheffield in the UK. Sharkey noted situations that may require decision-making beyond current robotic intelligence, such as civilians wandering into the field of fire or child soldiers forced into battle.

There are workaround solutions. Militaries will probably not replace humans entirely with robots, said Ronald Arkin, a robotics researcher at Georgia Tech. Instead, robots will operate and fight alongside humans in specialized roles. Their tireless presence may even end up saving lives, when weary human fighters might make bad decisions and end up abusing prisoners or killing civilians.

However, robotic perfection may not be feasible or ideal in all situations. And it is unclear if humans should demand more of robots than they do of themselves, in some ethical situations.

"It is not my belief that an autonomous unmanned system will be able to be perfectly ethical in the battlefield, but I am convinced that they can perform more ethically than human soldiers are capable of," Arkin told LiveScience.

And that question could become irrelevant as new technologies blur the line between robot and human.

from LiveScience …

for me … at present i am more afraid of humans then machines

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