title: Perceptual interaction of local motion signals.
abstract: Motion signals are a rich source of information used in many everyday tasks, such as segregation of objects from background and navigation. Motion analysis by biological systems is generally considered to consist of two stages: extraction of local motion signals followed by spatial integration. Studies using synthetic stimuli show that there are many kinds and subtypes of local motion signals. When presented in isolation, these stimuli elicit behavioral and neurophysiological responses in a wide range of species, from insects to mammals. However, these mathematically-distinct varieties of local motion signals typically co-exist in natural scenes. This study focuses on interactions between two kinds of local motion signals: Fourier and glider. Fourier signals are typically associated with translation, while glider signals occur when an object approaches or recedes. Here, using a novel class of synthetic stimuli, we ask how distinct kinds of local motion signals interact and whether context influences sensitivity to Fourier motion. We report that local motion signals of different types interact at the perceptual level, and that this interaction can include subthreshold summation and, in some subjects, subtle context-dependent changes in sensitivity. We discuss the implications of these observations, and the factors that may underlie them.
authors.affiliation: Program in Computational Biology & Medicine, Cornell University, Ithaca, NY, USAFeil Family Brain and Mind Research Institute, Weill Cornell Medical College, New York City, NY, USADepartment of Organismal Biology and Anatomy, University of Chicago, Chicago, IL, USAeyalni@gmail.com.
authors.forename: Eyal I
authors.initials: EI
authors.lastname: Nitzany
authors.affiliation: Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL, USAmarenloe49@gmail.com.
authors.forename: Maren E
authors.initials: ME
authors.lastname: Loe
authors.affiliation: Department of Organismal Biology and Anatomy and Committee on Computational Neuroscience, University of Chicago, Chicago, IL, USAsepalmer@uchicago.eduhttp://pondside.uchicago.edu/oba/faculty/palmer_s.html.
authors.forename: Stephanie E
authors.initials: SE
authors.lastname: Palmer
authors.affiliation: Feil Family Brain and Mind Research Institute, Weill Cornell Medical College, New York City, NY, USAjdvicto@med.cornell.eduhttp://www-users.med.cornell.edu/~jdvicto/jdvonweb.html.
authors.forename: Jonathan D
authors.initials: JD
authors.lastname: Victor
mesh_terms: D000328:Adult; D001921:Brain / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D009039:Motion Perception / Q000502:physiology*; D010775:Photic Stimulation; D011601:Psychophysics; D014795:Visual Pathways / Q000502:physiology*; D055815:Young Adult