The primary channels used by individuals to communicate with others are

The primary channels people use to communicate with others are sight and sound.

Seeing and hearing carry most face to face messages through words, expressions and gestures.

Radio and television are mass media outlets, not the basic personal channels of individuals.

E-mail is one written medium among many, far narrower than the senses themselves.

Tone of voice is a single vocal feature that works within sound, not a channel on its own.

Human communication rests first on the eye and the ear before any device.