Interaural intensity difference (IID)

When the sound source is not centered, the listener's head partially ``shadows'' the ear opposite to the source, diminishing the intensity of the sound in that ear

IID is frequency dependent and increases with frequency

**Figure 4:** Acoustic shadow contribues to IID.
$\scalebox{0.75}{\includegraphics{eps/IIDshadow.eps}}$

``Music 175: Space'' by Tamara Smyth, Department of Music, University of California, San Diego (UCSD).

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