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Even when the challenging of existing beliefs is encouraged, as in science, the dominant paradigm or mindset can prevent certain challenges, theories or experiments from being advanced. The philosophy of science mostly concerns itself with reducing the impact of these prior ideologies so that science can proceed with its primary task, which is (according to science) to create knowledge.
There are critics who view science as an ideology in itself, called scientism. Some scientists respond that, while the scientific method is itself an ideology, as it is a collection of ideas, there is nothing particularly wrong or bad about it.
Other critics point out that while science itself is not a misleading ideology, there are some fields of study within science that are misleading. Two examples discussed here are in the fields of ecology and economics.
A special case of science adopted as ideology is that of ecology, which studies the relationships between living things on Earth. Perceptual psychologist J. J. Gibson believed that human perception of ecological relationships was the basis of self-awareness and cognition itself. Linguist George Lakoff has proposed a cognitive science of mathematics wherein even the most fundamental ideas of arithmetic would be seen as consequences or products of human perception - which is itself necessarily evolved within an ecology.
Deep ecology and the modern ecology movement (and, to a lesser degree, Green parties) appear to have adopted ecological sciences as a positive ideology.Some accuse ecological economics of likewise turning scientific theory into political economy, although theses in that science can often be tested. The modern practice of green economics fuses both approaches and seems to be part science, part ideology.
This is far from the only theory of economics to be raised to ideology status - some notable economically-based ideologies include mercantilism, social darwinism, communism, laissez-faire economics, and " free trade". There are also current theories of safe trade and fair trade which can be seen as ideologies.
The ideologies of the dominant class of a society are proposed to all members of that society in order to make the ruling class' interests appear to be the interests of all, and thereby achieve hegemony. To reach this goal, ideology makes use of a special type of discourse: the lacunar discourse , as discussed by Althusser. A number of propositions, which are never untrue, suggest a number of other propositions, which are. In this way, the essence of the lacunar discourse is what is not told (but is suggested).
For example, the statement 'All are equal before the law', which is a theory behind current legal systems, suggests that all people may be of equal worth or have equal 'opportunities'. This is not true, because the concept of private property over the means of production results in some people being able to own more (much more) than others, and their property brings power and influence (the rich can afford better lawyers, among other things, and this puts in question the principle of equality before the law).
The dominant forms of ideology in capitalism are (in chronological order):
and they correspond to the stages of development of capitalism: