Key points
• We often don't notice it, but artificial intelligence (AI) is all around us.
It is present in computer games, in the cruise control in our cars and the
servers that route our email.
• The world's most powerful supercomputer can carry out 100 trillion operations
per second, which some scientists believe could be approaching the processing
power of the human brain.
• Machines have always excelled at tasks like calculation. But they can now
challenge humans on everything from chess to football to mixing music.
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Rogue Robot:
In June 2002, a robot called Gaak gave an alarming demonstration of its
independence. It made a dash for freedom from an exhibit at the Magna
science centre in Rotherham. Gaak crept along a barrier until it found a gap
and squeezed through. Having left the building, it reached Magna’s exit by
the M1 motorway before it was rumbled. |
What is AI?
So, can a machine behave like a person? This question underlies artificial
intelligence (AI), the study of intelligent behaviour in machines. In the 1980s,
AI research focused on creating machines that could solve problems and reason
like humans.
One of the most difficult problems in artificial intelligence is that of
consciousness. A consciousness gives us feelings and makes us aware of our own
existence. But scientists have found it difficult getting robots to carry out
even the simplest of cognitive tasks.
Creating a self-aware robot with real feelings is a significant challenge faced
by scientists hoping to mimic human intelligence in a machine.
Since the early 1990s, researchers have concentrated on developing smaller,
independent robots instead of trying to recreate human intelligence. The model
for many of these machines is insect intelligence, which is - in its own way -
very sophisticated.
Supercomputer:
When it is completed in late 2004, the world's most powerful computer will be
ASCI Purple, built by IBM. It is expected to carry out 100 trillion operations
per second (or 100 teraflops). A supercomputer with double this processing power
is expected within the next two years. It is being built to replace ASCI White -
formerly the world's most powerful computer - which occupies a space the size of
two basketball courts at the Lawrence Livermore National Laboratory in
Livermore, California.
A spokesman for IBM said that ASCI Purple was approaching the processing power
of the human brain. But some scientists believe our brains can carry out around
10,000 trillion operations per second. HAL, the supercomputer that rebels
against its human handlers in the film 2001: A Space Odyssey (1968), is a cheeky
reference to IBM. The letters H, A and L, precede I, B and M in the alphabet.
Turing Test:
In 1950, mathematician Alan Turing devised a test to identify whether a machine
displayed intelligence. In the Turing Test, two people (A and B) sit in a closed
room, while an interrogator (C) sits outside. Person A tries to fool the
interrogator about their gender, while person B tries to assist the interrogator
in their identification. Turing suggested a machine take the place of person A.
If the machine consistently fooled the human interrogator, it was likely to be
intelligent.
Film stars:
The possible dangers posed by intelligent machines have inspired countless
science fiction films. In The Terminator (1984), a computer network nukes the
human race in order to achieve supremacy. This network then manufactures
intelligent robots called 'Terminators' which it programs to annihilate human
survivors.
In The Matrix (1999) and The Matrix Reloaded (2003), a machine enslaves
humanity, using people as batteries to power its mainframe. Steven Spielberg’s
AI: Artificial Intelligence (2002) paints a more sympathetic view of artificial
life, depicting sensitive robots that are abused by brutal, selfish human
masters.
Man and machine
Smart games
One place where artificial intelligence has found a natural home is in the
development of computer games. AI in computer games is becoming increasingly
sophisticated as consumer appetites for better, faster, more challenging games
grows. In games, AI is often present in the opponents you play against, or in
allies or other team members.
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From circuit board to
chess board
In 1997, then world chess champion Garry Kasparov played against IBM’s Deep
Blue supercomputer – and lost. After six games, the mighty Kasparov lost 2.5
to 3.5 to the silicon upstart. In February 2003, Kasparov salvaged some
credibility for humanity by drawing against the Israeli-built supercomputer
Deep Junior. Kasparov went on to draw 2-2 against US company X3D
Technologies' supercomputer X3D Fritz in November 2003, proving that the
human brain can keep up with the latest developments in computing (at least
in chess).
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Sporting chance
The RoboCup football championship features robots playing the beautiful
game. The tournament has different leagues for different robot types,
including one for Sony’s Aibos and one for humanoid robots. Despite the
mechanical style of play on show, the tournament is proving a popular annual
fixture. |
In the RoboCup junior championships, independent robots compete one-on-one on
a miniature football table with a greyscale pattern. The robots use this dark to
pale gradient to navigate their way to the opponent's goal. A special ball is
used which contains sensors that communicate with sensors in the robot.
Social skills
Despite these entertaining applications, the original point of AI research
was to create machines that could understand us. At the Massachusetts Institute
of Technology (MIT), scientists have designed a robot called Kismet that can
have realistic conversations with people. Kismet is capable of seven different
facial expressions and can vary the tone of its voice. It also adjusts its gaze
and the orientation of its head towards the person it is speaking to.
Hey DJ
Scientists at HP have designed an electronic DJ. The 'hpDJ' selects beats and
baselines from its memory bank and mixes them. Its makers say it could be made
to react to the mood of clubbers.
Almost human
At the University of Texas, Dallas, researchers have designed a lifelike
human face to capable of 28 facial movements, including smiling, sneering,
furrowing its brow and arching its eyebrows. It could be used to put a human
face to the artificial brains of the
Robot future
Building bridges
A computer program developed at Brandeis University in Massachusetts has
learnt how to design and build bridges, cranes and tables all by itself. It
reinvented support structures such as the cantilever and the triangle without
prior knowledge of them.
Fraud busting
Credit card companies use a computer program called The Falcon to detect
card fraud. The Falcon works by constantly updating a profile of how customers
use their credit cards. It then looks for uncharacteristic patterns of credit
card use in the data.
Roving eyes
A robotic head built by a Scottish robotics company can determine a woman’s
attractiveness. It works by examining faces to determine how 'feminine' or
'masculine' they are. It doesn’t work in reverse because men’s appeal is
supposedly not based as much on looks. Perhaps jokingly, researchers say it
could be put to use as an artificial receptionist.
Consumer gadgets
Robots designed for the consumer market and employing very basic forms of AI
have become increasingly popular in recent years.
Sony's Aibo robot dog behaves like a puppy when it is first activated. But it
"learns" new behaviour as it spends more time with its human owner.
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NeCoRo cat
Omron's NeCoRo robotic cat and Sanyo's robotic guard dog are other
examples of this wave of consumer robots. This is likely to continue in
future as consumer robots become more and more sophisticated. |
Air ware
A software program called FACES could stop mid-air collisions between planes. It
makes planes perform avoidance manoeuvres in synch. When tested in a flight
simulator, the software prevented a pile-up between 35 planes sharing airspace.
Brave new world
Over the coming century, breakthroughs in nanotechnology, the science of
ultra-small machines constructed at the molecular level, may help us build more
sophisticated machines that are more compact.
We may also see breakthroughs from scientists who are experimenting with
connecting biological cells to silicon circuits - a phenomenon called wetware.