Recording and analysis of head movements, interaural level and time differences in rooms and real-world listening scenarios.

The science of how we use interaural differences to localise sounds has been studied for over a century and in many ways is well understood. But in many of these psychophysical experiments listeners are required to keep their head still, as head movements cause changes in interaural level and time differences (ILD and ITD respectively). But a fixed head is unrealistic.

The contribution of head movement to the externalization and internalization of sounds.

Background: When stimuli are presented over headphones, they are typically perceived as internalized; i.e., they appear to emanate from inside the head.

Auditory externalization in hearing-impaired listeners: the effect of pinna cues and number of talkers.

Hearing-aid wearers have reported sound source locations as being perceptually internalized (i.e., inside their head).