| Popis: |
Current methodologies do not fully account for the dynamic nature of sound localization behavior. Particularly, the restriction of head movement and choice of a discrete accuracy measures have led to a relatively static picture of sound localization. The purpose of the current work is to explore the nature of active sound localization by capturing head movement, exhibited during the localization of continuous sounds, using differential equation modeling. Specifically, an equation like that which describes the behavior of a damped mass-spring is used to model head rotation relative to a sound’s source position. Two main experiments and one pilot study are presented here. The pilot study demonstrates the viability of the experimental and modeling approach while Experiments 1 and 2 extend it to address behavioral change due to visual feedback and moving sound source localization, respectively. All three experiments (Pilot, Ex. 1 and Ex. 2) utilize a virtual reality (VR) environment and sound spatialization scheme. Time series data of head rotation is recorded from each participant during each localization trial. The results of Experiment 1 show that visual feedback about the correct sound source position significantly affects localization behavior. The results of Experiment 2 show that the same parameter values of the model can be used to account for both stationary and moving sound source localization. In total, this work provides a potential avenue for continued investigation of active sound localization behavior and support for the view that localization is a fundamentally active phenomenon. |
