Questions 31-35 - Few words to say about this book

100
READING PASSAGE 8
Telepathy
Can human beings communicate by thought alone? For more than a century the issue of telepathy has divided
the scientific community, and even today it still sparks bitter controversy among top academics
Since the 1970s, parapsychologists at leading universities and research institutes around the world have risked
the derision of sceptical colleagues by putting the various claims for telepathy to the test in dozens of rigorous
scientific studies. The results and their implications are dividing even the researchers who uncovered them.
Some researchers say the results constitute compelling evidence that telepathy is genuine. Other
parapsychologists believe the field
is on the brink of collapse, having tried to produce definitive scientific
proof and failed. Sceptics and advocates alike do concur on one issue, however: that the most
impressive evidence so far has come from the so-called 'ganzfeld' experiments, a German term that means
'whole field'. Reports of telepathic experiences had by people during meditation led parapsychologists to
suspect that telepathy might involve 'signals' passing between people that were so faint that they were usually
swamped by normal brain activity. In
this case, such signals might be more easily detected by those
experiencing meditation-like tranquillity in a relaxing 'whole field' of light, sound and warmth.
The ganzfeld experiment tries to recreate these conditions with participants sitting in soft reclining chairs in a
sealed room, listening to relaxing sounds while their eyes are covered with special filters letting in only soft
pink light. In early ganzfeld experiments, the telepathy test involved identification of a picture chosen from
a random selection of four taken from a large image bank. The idea was that a
person acting as a
'sender' would attempt to beam the image over to the 'receiver' relaxing in the sealed room.
Once the session was over, this person was asked to identify which of the four images had been
used. Random guessing would give a hit-rate of 25 per cent; if telepathy is real, however, the hit-rate would be
higher. In 1982, the results from the first ganzfeld studies were analysed by one of its pioneers,
the American
parapsychologist Charles Honorton. They pointed to typical hit-rates of better than 30 per cent - a small effect,
but one which statistical tests suggested could not be put down to chance.
The implication was that the ganzfeld method had revealed real evidence for telepathy. But there was
a crucial flaw in this argument - one routinely overlooked in more conventional areas of science. Just because
chance had been ruled out as an explanation did not prove telepathy must exist; there were many other ways of
getting positive results. These ranged from 'sensory leakage' - where clues about the pictures accidentally reach
the receiver - to outright fraud. In response, the researchers issued a review of all the
ganzfeld studies done up
to 1985 to show that 80 per cent had found statistically significant evidence. However, they also agreed that
there were still too many problems in the experiments which could lead to positive results, and they drew up a
list demanding new standards for future research.
After this, many researchers switched to autoganzfeld tests - an automated variant of the technique which used
computers to perform many of the key tasks such as the random selection of images. By minimising human
involvement, the idea was to minimise the risk of flawed results. In 1987, results from hundreds of
autoganzfeld tests were studied by Honorton in a 'meta-analysis', a statistical technique for finding
the overall results from a set of studies. Though
less compelling than before, the outcome was still impressive.
Yet some parapsychologists remain disturbed by the lack of consistency between individual ganzfeld studies.
Defenders of telepathy point out that demanding impressive evidence from every study ignores one basic
statistical fact: it takes large samples to detect small effects. If, as current results suggest, telepathy produces
hit-rates only marginally above the 25 per cent expected by chance, it's unlikely to be detected by a typical
ganzfeld study involving around 40 people: the group is just not big enough. Only when
many studies are
combined in a meta-analysis will the faint signal of telepathy really become apparent. And that is what
researchers do seem to be finding.
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What they are certainly not finding, however, is any change in attitude of mainstream scientists: most still
totally reject the very idea of telepathy. The problem stems at least in part from the lack of any
plausible mechanism for telepathy.
Various theories have been put forward, many focusing on esoteric ideas from theoretical physics. They
include 'quantum entanglement', in which events affecting one group of atoms instantly affect another group,
no matter how far apart they may be. While physicists have demonstrated
entanglement with specially
prepared atoms, no-one knows if it also exists between atoms making up human minds. Answering such
questions would transform parapsychology. This has prompted some researchers to argue that the future lies
not in collecting more evidence for telepathy, but in probing possible mechanisms. Some work has begun
already, with researchers trying to identify people who are particularly successful in autoganzfeld trials. Early
results show that creative and artistic people do much better than average: in one
study at the University of
Edinburgh, musicians achieved a hit-rate of 56 per cent. Perhaps more tests like these will eventually give the
researchers the evidence they are seeking and strengthen the case for the existence of telepathy.