High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Interpersonal communication is usually defined by communication scholars in numerous ways, usually describing participants who are dependent upon one another and have a shared history. Communication channels, the conceptualization of mediums that carry messages from sender to receiver, take two distinct forms: direct and indirect. Direct channels are obvious and easily recognized by the receiver. Both verbal and non-verbal information is completely controlled by the sender. Verbal channels rely on words, as in written or spoken communication. Non-verbal channels encompass facial expressions, controlled body movements (police present hand gestures to control traffic), color (red signals 'stop', green signals 'go'), and sound (warning sirens).