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.
Where Brown's weak version of the linguistic relativity hypothesis proposes that language influences thought and the strong version that language determines thought, Fishman's 'Whorfianism of the third kind' proposes that language is a key to culture.