science, and its excessively low level of ‘scientific literacy’, and to
call for quantitative and qualitative improvements in scientific
communication addressed to the public at large.
7
Although a certain
degree of public ignorance is undeniable – for instance, European
surveys on the public perception of biotechnology found that more
than 30 per cent of the population thought that, unlike genetically
modified tomatoes, ‘normal’ ones do not contain genes
8
– numerous
criticisms have been made of this approach. The indicators used to
measure the public understanding of science are often debatable. For
example, in 1991 a study by the National Science Foundation
complained that only 6 per cent of interviewees were able to give a
scientifically correct answer to a question on the causes of acid rain;
but it neglected the fact that specialists themselves still disagree as
to what those causes actually are. Other studies have emphasized the
complex articulation of public images of science, where a belief that
astrology is a scientific discipline – classified by numerous surveys
as indicative of scientific illiteracy – is often accompanied by a
sophisticated understanding of science.
9
Anything but established,
moreover, is the linkage among exposure to scientific information in
the media, level of knowledge, and a favourable attitude towards
research. As regards biotechnology, for example, recent studies have
highlighted substantial levels of scepticism and suspicion even in the
best-informed sectors of the population.
10
More generally, the cleavage between expert and lay knowledge
cannot be reduced to what the ‘deficit model’ of the public aware-
ness of risk regards as merely an information gap between specialists
and the general public. Factual knowledge is only one ingredient of
lay knowledge, in which other elements (value judgements, trust in
the scientific institutions) inevitably interweave to form a complex
which is no less articulated than the expert one. The source which
Europeans regard as providing the most trustworthy information
about biotechnology, for example, are consumer associations (Gaskell
et al., 2000). Scientific information may be ignored by the public as
irrelevant or scarcely applicable to their everyday concerns, as has
been the case of information campaigns on what to do in the case of
emergencies in communities located close to nuclear power plants.
The representation of risk by medical experts, for instance, and the
relationship between causes and effects in contemporary medicine,
are increasingly expressed in formal and probabilistic terms. Yet, the
perception of non-experts is inevitably based on subjective experi-
ences and concrete examples. In a study carried out on English
mothers who had refused to have their babies vaccinated as required
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