Imaging Science Seminar: Quantitative characterization of human visual behavior: accommodation and temporal processing in the visual system
Imaging Science Seminar
Quantitative characterization of human visual behavior: accommodation and temporal processing in the visual system
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Dr. Benjamin Chin
Assistant Professor, Center for Imaging Science
Rochester Institute of Technology
Event Details: The ease with which human beings interact with and navigate our environment testifies to the success of human vision as an imaging system. I will present research on two fundamental visual tasks that are performed frequently in daily life, yet are highly complex. First, I will present objective measurements of the eye’s focusing response, known as visual accommodation. Due to longitudinal chromatic aberration (LCA) in the eye, the visual system, at any given time, can only accommodate to focus light at a single wavelength. I am particularly interested in what wavelength this is, and whether it varies with the properties of visual stimulation. My measurements indicate that the wavelength in focus systematically varies with the spectral content of light entering the eye. Computational modeling shows, counterintuitively, that this accommodative behavior does not always maximize visual acuity, or preciseness. These results have potential implications for proposed methods of controlling myopia (also known as short-sightedness). In the second part of this talk, I will discuss the human ability to perceive depth and how it is impacted by differences in temporal processing dynamics between the eyes. I will demonstrate experimental methods for quantifying these temporal dynamics as well as for controlling them via color manipulations to produce a classic visual illusion known as the Pulfrich effect.
Bio: I am a new Assistant Professor at the Chester F. Carlson Center for Imaging Science. I completed my Ph.D. in psychology at the University of Pennsylvania and was most recently a postdoctoral researcher at the UC Berkeley School of Optometry up until this past June. My interest is in the computational mechanisms underlying important visual tasks such as accommodation, motion perception, and depth perception. I employ methods from visual psychophysics, computational modeling, and continuous response measurements, such as hand and eye tracking.
Intended Audience:
All are Welcome!
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