1) Strong social relationships and avoiding loneliness provide significant health benefits, while social isolation is a major risk factor for disease.
2) Communication is a complex process where people interact through symbols to create and interpret meanings in a systemic way. Early models of communication focused on simple linear exchanges, but modern models recognize the transactional nature of communication.
3) Many factors can introduce noise or ambiguity into communication exchanges, including environmental factors, internal states, and the symbolic and personal nature of deriving meaning from words and messages. Establishing shared contexts is important for effective communication.