Pictures of you: Dot stimuli cause motor contagion in presence of a still human form |
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| Affiliation: | 1. State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing 100191, China;2. Modern Research Center for Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100029, China;1. Intelligent Data Center and Department of Mathematics, Sun Yat-Sen University, Guangzhou 510275, China;2. School of Mathematics, JiaYing University, Meizhou, Guangdong 514015, China;1. Department of Gynecology and Obstetrics, Emory University, Atlanta, GA, USA;2. Division of Reproductive Health, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA, USA;3. Division of Congenital and Developmental Disorders, National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA, USA;4. University of Puerto Rico, Área Centro Medico, San Juan, Puerto Rico;5. Puerto Rico Section of the American College of Obstetricians and Gynecologists, San Juan, Puerto Rico;6. Puerto Rico Obstetrics and Gynecology, San Juan, Puerto Rico;7. National Foundation for the Centers for Disease Control and Prevention, Atlanta, GA, USA;1. Memorial Sloan Kettering Cancer Center, 1275 York Ave, New York, NY 10065, USA;2. Modus Outcomes, Spirella Building, Letchworth Garden City, SG6 4ET, UK;3. McMaster University, 3N27, 1200 Main Street W, Hamilton, ON L8N 3Z5, Canada;4. Henry Ford Health System, 2799 W. Grand Blvd, K-16, Detroit, MI 48202, USA;1. Polymerization Engineering Department, Iran Polymer and Petrochemical Institute (IPPI), P.O. Box 14965/115, Tehran, Iran;2. School of Chemistry, University College Cork, College Road, Cork, Ireland;3. Gas Conversion Department, Faculty of Petrochemicals, Iran Polymer and Petrochemical Institute, PO Box 14975-112, Tehran, Iran;4. Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, c/Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain |
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| Abstract: | In this study, we investigate which visual cues induce participants to encode a non-human motion stimulus in their motor system. Participants performed reach-to-grasp actions to a target after observing a dot moving in a direct or higher-arcing path across a screen. Dot motion occurred in the presence of a meaningless (scrambled human model) stimulus, a still human model, or a human model performing a direct or exaggeratedly curved reach to a target. Our results show that observing the dot displacement causes motor contagion (changes in the height of the observer’s hand trajectory) when a human form was visually present in the background (either moving or still). No contagion was evident, however, when this human context was absent (i.e., human image scrambled and not identifiable). This indicates that visual cues suggestive of human agency can determine whether or not moving stimuli are encoded in the motor system. |
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| Keywords: | Action observation Motor contagion Ideomotor priming |
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