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Intersubjective verifiability is the core principle of scientific investigation or empiricism as a joint activity by individuals. Each person composes a subjectivity, i.e., is an experiencing being, an aware, sentient self. Each person's experience then includes individual, subjective experience of the external world, as well as experience of the individual's internal world (thoughts, feelings, bodily sensations). While only the individuals can directly know (have direct experience of) their own personal internal world, the external, public world apparently can be known (experienced by) many people, albeit each from a different point of view and a different temporal moment. The term intersubjective verifiability, then, refers to the capability of a concept to be readily shared among persons with a common, accurate language. The term intersubjective, when used in the context of intersubjective verifiability, may also be interpreted as objective.
Note that while specific internal experiences are not intersubjectively verifiable, the existence of thematic patterns of internal experience can be intersubjectively verified. For example, whether or not people are telling what they believe to be the truth when they make claims can only be known by the claimants. However, we can intersubjectively verify that people almost universally experience discomfort (hunger) when they haven't had enough to eat. We generally have only a crude ability to compare (measure) internal experiences.
When an external, public phenomenon is experienced and carefully described (in words or measurements) by one individual, other individuals can see if their experiences of the phenomenon "fit" the description. If they do, we have a sense of congruence between one subjectivity and another. This is the basis for a definition of what is true that is agreed upon by the involved parties. If the description does not fit the experience of one or more of the parties involved, we have incongruence.
Incongruent contradictions between the experience and descriptions of different individuals can be caused by
- inconsistent use of language in the descriptions such that the individuals are using words differently (semantic problems requiring more careful development of and use of language)
- a failure to describe the phenomena well (requiring further development of the description, model, or theory used to refer to the phenomena)
- the fact that the descriptions do not conform to consensual, i.e., inersubjectively verifiable, experience (the descriptions are faulty, incorrect, wrong, inaccurate, etc., and need to be replaced by more accurate descriptions, models, and/or theories)
Despite areas of belief that do not employ intersubjective verifiability (e.g., many religious claims), intersubjective verifiability is a universal way of arbitrating truth claims used by all people everywhere. In its basic form, it can be found in colloquial expressions, e.g., "I'm from Missouri. Show me!" or "Seeing is believing." The scientific principle of replication of findings by investigators other than those that first reported the phenomenon is simply a more highly structured form of the universal principle of intersubjective verifiability.
Intersubjective verifiability versus belief based on faith (Science versus Religion)
The contradiction between the truths derived from intersubjective verification and beliefs based on faith or authority (e.g., many religious beliefs) forms the basis for the conflict between religion and science. There have been attempts to bring the two into congruence, and the modern, cutting edge of science, especially in physics, seems to many observers to lend itself to a melding of religious experience and intersubjective verification of beliefs. Some scientists have described religious worldviews---generally of a mystical nature---consistent with their understanding of science:
There are two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle . . .
Science without religion is lame, religion without science is blind . . .
The religion of the future will be a cosmic religion. The religion which is based on experience, which refuses dogmatism . . .
There remains something subtle, intangible and inexplicable. Veneration for this force beyond anything that we can comprehend is my religion. (Albert Einstein)
Other scientists, who are committed to basing belief on intersubjective verification, have actively called for or predicted the development of a religion consistent with science.
A religion old or new, that stressed the magnificence of the universe as revealed by modern science, might be able to draw forth reserves of reverence and awe hardly tapped by the conventional faiths. Sooner or later, such a religion will emerge. (Carl Sagan, Pale Blue Dot)
The evolutionary epic is probably the best myth we will ever have ... The true evolutionary epic, retold as poetry, is as intrinsically ennobling as any religious epic. (Edward O. Wilson)
Responding to this apparent overlap between cutting edge science and mystical experience, in recent years, there have been overt efforts to formulate religious belief systems that are built on truth claims based upon intersubjective verifiability, e.g., Yoism.
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