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Computer-animated stimuli to measure motionsensitivity： constraints on signal design in theJacky dragon

Current Zoology 2017年第1期63卷 75-84页

作者： Kevin L. Woo guillaume rieucau Darren BURKE SUNY Empire State College Metropolitan Center 325 Hudson Street New York NY 10013-1005 USA Department of Biological Sciences Florida International University 3000 Northeast 151 St North Miami FL 33181 USA School of Psychology University of Newcastle 10 Chittaway Road Ourimbah New South Wales 2258Australia

Identifying perceptual thresholds is critical for understanding the mechanisms that underlie signalevolution. Using computer-animated stimuli, we examined visual speed sensitivity in the Jackydragon Amphibolurus muricatus, a species that makes extensive use of rapid motor patterns in so-cial communication. First, focal lizards were tested in discrimination trials using random-dot kine-matograms displaying combinations of speed, coherence, and direction. Second, we measuredsubject lizards＇ ability to predict the appearance of a secondary reinforcer （1 of 3 differentcomputer-generated animations of invertebrates： cricket, spider, and mite） based on the directionof movement of a field of drifting dots by following a set of behavioural responses （e.g., orientingresponse, latency to respond） to our virtual stimuli. We found an effect of both speed and coher-ence, as well as an interaction between these 2 factors on the perception of moving ***, our results showed that Jacky dragons have acute sensitivity to high speeds. We then em-ployed an optic flow analysis to match the performance to ecologically relevant motion. Our resultssuggest that the Jacky dragon visual system may have been shaped to detect fast motion. Thispre-existing sensitivity may have constrained the evolution of conspecific displays. In contrast,Jacky dragons may have difficulty in detecting the movement of ambush predators, such as snakesand of some invertebrate prey. Our study also demonstrates the potential of the computer-animated stimuli technique for conducting nonintrusive tests to explore motion range and sensitiv-ity in a visually mediated species.

关键词： Amphibolurus muricatus, Jacky dragon, motion sensitivity, random-dot kinematograms, signal evolution, virtualstimuli.

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Technical and conceptual considerations forusing animated stimuli in studies of animalbehavior

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Current Zoology 2017年第1期63卷 5-19页

作者： Laura CHOUINARD-THULY Stefanie GIERSZEWSKI Gil G. ROSENTHAL Simon M. READER guillaume rieucau Kevin L. Woo Robert GERLAI Cynthia TEDORE Spencer J. INGLEY John R. STOWERS Joachim G.FROMMENI Francine L. DOLINS Klaudia WITTE Department of Biologv McGill University 1205 Docteur Penfield Montreal Quebec Canada H3A 1B1 Research Group of Ecology and Behavioral Biology Institute of Biology University of Siegen Adolf-Reichwein Str. 2 Siegen 57068 Germany Ecology & Evolutionary Biology Texas A&M University 3258 TAMU College Station TX 77843 USA Centro de Investigaciones Cientfficas de las Huastecas "Aguazarca" Calnali Hidalgo Mexico Departmentof Biological Sciences Florida International University 3000 Northeast 151 Street North Miami FL 33181 USA SUNY Empire State College Metropolitan Center 325 Hudson Street New York NY 10013-1005 USA Departmentof Psychology University of Toronto Mississauga 3359 Mississauga Road Mississauga Ontario Canada L5L 1C6 Lund Vision Group Department of Biology Lund University SSIvegatan 35 Lund 22362 Sweden Department of Biology University of North Carolina at Chapel Hill CB#3280 Coker Hall Chapel Hill NC 27599 USA Research Institute of Molecular Pathology IMP Vienna Biocenter VBC Dr. Bohr-Gasse 7 Vienna 1030 Austria loopbiogmbh Hauptstrasse 93 Kritzendorf 3420 Austria Department of Behavioural Ecology Institute of Ecology and Evolution University of Bern Wohlenstrasse 50a Hinterkappelen 3032 Switzerland Department of Behavioral Sciences University of Michigan-Dearborn 4901 Evergreen Road Dearborn MI 48128 USA

Rapid technical advances in the field of computeropened new avenues in animal behavior *** （CA） and virtual reality （VR） haveAnimated stimuli are powerful tools as theyoffer standardization, repeatability, and complete control over the stimulus presented, thereby＂reducing＂ and ＂replacing＂ the animals used, and ＂refining＂ the experimental design in line withthe 3Rs. However, appropriate use of these technologies raises conceptual and technical *** this review, we offer guidelines for common technical and conceptual considerations related tothe use of animated stimuli in animal behavior research. Following the steps required to create ananimated stimulus, we discuss （I） the creation, （11） the presentation, and （111） the validation of CAsand VRs. Although our review is geared toward computer-graphically designed stimuli, consider-ations on presentation and validation also apply to video playbacks. CA and VR allow both new be-havioral questions to be addressed and existing questions to be addressed in new ways, thus weexpect a rich future for these methods in both ultimate and proximate studies of animal behavior.

关键词： animal behavior, animated stimulus, computer animation, experimental design, virtual reality, visual communication.

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