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.
Linguistics is the study and practice of understanding how languages form and evolve. Individuals in the field will be responsible for understanding and identifying various aspects of a given language, including constructing and referencing ancient and dead languages for the purposes of research and reconstruction.