The long-term goal of my research is to elucidate the set of interrelated computational problems that biological perceptual systems must solve in order to represent the natural sensory environment and extract useful information from it. A fundamental motivation of this work is to develop testable theories of perceptual function. The crux of this problem is that although we can observe features and properties of biological systems, the computational problems they solve are far from obvious. Work in my group spans many levels, from sensory coding to mid-level perception, in both vision and audition. We also have a deep interest in the mathematical algorithms and applications that stem from this work.