Ideal observer theory
Ideal observer theory is the
The main idea [of the ideal observer theory] is that ethical terms should be defined after the pattern of the following example: "x is better than y" means "If anyone were, in respect of x and y, fully informed and vividly imaginative, impartial, in a calm frame of mind and otherwise normal, he would prefer x to y."[1]
This makes ideal observer theory a
Adam Smith and David Hume espoused versions of the ideal observer theory. Roderick Firth laid out a more sophisticated modern version.[3] According to Firth, an ideal observer has the following specific characteristics: omniscience with respect to nonmoral facts, omnipercipience, disinterestedness, dispassionateness, consistency, and normalcy in all other respects. Notice that, by defining an Ideal Observer as omniscient with respect to nonmoral facts, Firth avoids circular logic that would arise from defining an ideal observer as omniscient in both nonmoral and moral facts. A complete knowledge of morality is not born of itself but is an emergent property of Firth's minimal requirements. There are also sensible restrictions to the trait of omniscience with respect to nonmoral facts. For instance, to make a moral judgment about a case of theft or murder on Earth it is not necessary to know about geological events in another solar system.
Those using the ideal observer theory do not usually assert that ideal observers actually exist. An analogous idea in law is the reasonable person criterion.
References
- LCCN 59010075.
- ^ Brandt 1959, p. 153: "[Objectivism and subjectivism] have been used more vaguely, confusedly, and in more different senses than the others we are considering. We suggest as a convenient usage, however, that a theory be called subjectivist if and only if, according to it, any ethical assertion implies that somebody does, or somebody of a certain sort under certain conditions would, take some specified attitude toward something."
- JSTOR 2103988.