Interaural level differences and time shifts trade off to control lateralization

Evidence

The perceived lateral position of an auditory event with varied ITD cues while keeping the ILD constant has been measured in headphone experiments, and the results are shown in Figure 12.11a. The position is measured with impulse-like stimuli having a time difference τph. In principle, the perceived lateral position shifts in the direction of the ear at which the signal arrives first. For time differences from −600 μs to +600 μs, the dependence on lateral position is linear, and for time differences in the range of about 1–20 ms, the sound is perceived in the ear corresponding to the preceding impulse (Blodgett et al., 1956). With even larger ITDs and for continuous signals, the subjects can no longer tell on which side the auditory event occurs; they may perceive one on each side or perceive a diffuse source in all directions. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1431

Categorization

• DEFINE: Explains how ITD relates to perceived lateral position across regimes, including breakdown.
• corroborated: 4 independent passages support this claim — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1431
• XREF: connects to: Carrier and envelope time shifts produce lateralization over complementary frequency ranges; Lateralization is one-dimensional while localization spans three dimensions — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1708; Head shading creates interaural level differences used for sound localization — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 726 (+3 more)

Broader Connections

• Head shading creates interaural level differences used for sound localization #expands (0.80) — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 726