手法を比較

	Perceptual Dialectology	Apparent-Time Analysis
分野	言語学	言語学
系統	Process / pipeline	Process / pipeline
提唱年	1989	1963
提唱者	Dennis R. Preston (building on Dutch and Japanese folk-dialectology traditions)	William Labov
種類	Folk-linguistic method for studying non-linguists' perceptions of dialects	Inferential design for detecting language change in progress
原典	Preston, D. R. (1989). Perceptual Dialectology: Nonlinguists' Views of Areal Linguistics. Foris. ISBN: 9789067654487	Labov, W. (1963). The social motivation of a sound change. Word, 19(3), 273–309.
別名	Folk Dialectology, Perceptual Dialect Mapping, Draw-a-Map Dialectology	Apparent-Time Construct, Apparent-Time Hypothesis, Age-Stratified Change Analysis
関連	4	4
概要	Perceptual dialectology studies what ordinary, non-linguist speakers believe about language variation: where they think different dialects are spoken, what those dialects sound like, and how correct, pleasant, or different they judge them to be. Developed in its modern form by Dennis R. Preston in the 1980s, it is a branch of folk linguistics that treats lay perceptions as data in their own right rather than as errors to be corrected. Through draw-a-map tasks, dialect ranking, and identification exercises, it reveals the mental maps and social evaluations that shape how people experience the linguistic landscape around them.	Apparent-time analysis is the foundational variationist method for detecting language change in progress without waiting for time to pass. Introduced by William Labov in his 1963 study of Martha's Vineyard, it compares the speech of speakers of different ages sampled at a single moment and treats the age dimension as a proxy for historical time: if younger speakers use a variant more than older speakers, that age gradient is read as evidence of change unfolding across generations. The inference rests on the apparent-time hypothesis — that an individual's vernacular is largely fixed in adolescence and remains stable through adult life — so that the speech of today's seventy-year-olds reflects the community norms of roughly fifty years ago.