Introduction The Physical Ear Hearing Conservation Auditory Sensitivity Versus Frequency Threshold Value—the Minimum Audible Field Equal-Loudness Curves What’s Wrong With the Decibel—Magnitude Scaling Loudness Versus Time Spectrum of a Sound Critical Bands of Hearing Frequency Masking Temporal Masking Pitch Spatial Perception Transients and the Precedence Effect Influence of Sight on Sound Localization Localization in Three Dimensions: Horizontal, Vertical, and Depth The Cocktail Party Effect (Binaural Discrimination) Auditory Pattern and Object Perception Information Used to Separate Auditory Objects Gestalt Principles Speech Perception Speech for Film and Television Influence of Sight on Speech Intelligibility The Edge of Intelligibility Conclusion