Most buyers will also be in an emotional state. If you can remember that you are selling not just a piece of property but also an image, a dream and a lifestyle, you'll be more likely to put in the extra effort of staging and perhaps some minor remodeling to get top dollar for your home.
The branch of linguistics concerned with linguistic performance, that is, the production and comprehension of speech (or of sign language by the deaf), is called psycholinguistics. Psycholinguists also investigate how children acquire the complex grammar that underlies language use.
Language, Thought and Consciousness will form essential reading for all those interested in the nature and significance of natural language, whether they come from philosophy, psychology, or linguistics. If Carruthers is right, the study of language is  in a very real sense  the study of thought. This has two enormously important consequences. First, it puts linguistics centre stage in cognitive science; second it sanctions the linguistic turn which has so much dominated twentieth-century philosophy.