Psycholinguistics is a branch of study that combines psychology and linguistics. It examines the processes that occur in the brain during the production and perception of both written and spoken language. Psycholinguistics is interested in how the human mind stores words and grammar rules, and how memory is involved in speaking and listening. It also analyzes language acquisition and disorders. Psycholinguistics covers comprehension, speech production, and language acquisition. Speech production involves selecting words, formulating sounds, and articulating words using the vocal apparatus. Language acquisition is how humans learn to understand, produce, and communicate with language.