Head-Related Transfer Function

Hanging bats

    Bats monitor their environment by making ultrasonic vocalizations and listening to echoes reflected from objects in the scene. Localizing the position of the object is a very important function to perceive three-dimensional scene. Echoes arrive to the head interact with the head and external ear in a direction-dependent sense. The transformation as a result of the interaction creates the physical cues necessary to localize the source of the echo. The direction dependent transformations can simply be modeled as time independent transfer functions of linear systems. The project I am involved in aims to measure and analyze these transfer functions, head related transfer functions (HRTF), to understand more about sound localization by bats. I am currently investigating cues for sound localization that are likely to be used by evaluating frequency sturucture of the HRTFs. Hypothesis as a result of these investigations will be tested by behavioral experiments.

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