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Estimating Occult Timing of Surprise Gunshot Sounds in Silent Film Via
ARTICLE Original Article Estimating Occult Timing of Surprise Gunshot Sounds in Silent Film via Observed Start of Human Voluntary Reactions of Concern Brian Roselle1 & Kenneth Scearce2 1Fairfield, OH, USA 2San Francisco, CA, USA ABSTRACT ARTICLE INFORMATION Voluntary human reactions, and associated perception times when reaction movements commence, are iden- Received: 2 March 2019 tified to estimate gunshot sound arrival time to subjects in a shooting scenario recorded on silent film. Com- Revised: 23 January 2020 mon involuntary reactions (startle) and voluntary reactions are reviewed to help identify proper reaction Accepted: 29 January 2020 types being observed and apply in back-calculating gunshot timing. With a focus on voluntary reactions, Published: 8 August 2020 values for perception time as a function of stimulus expectancy, specifically in the case of a surprise stimulus, Citation: Roselle B, Scearce K. Estimat- are determined by reapplication of brake perception-reaction time (brake PRT) modeling of extensive driver ing Occult Timing of Surprise Gunshot Sounds in Silent Film via Observed reaction time studies in traffic flow theory. Using a modified model in conjunction with sampling human Start of Human Voluntary Reactions reactions observed on film allows back-calculating surprise gunshot sound timing. To detail use of this of Concern. J Assoc Crime Scene approach, a well-known example of a silent film, the Abraham Zapruder film of the Kennedy shooting, is Reconstr. 2020;24:1-22. considered to help identify the first shot timing in that case. Author contact: Keywords: chronology, gunshot timing, perception-reaction time, perception time, surprise voluntary [email protected] reaction, startle reaction, Zapruder film, shooting reconstruction, crime scene reconstruction, forensic science [email protected] Introduction An integral part of overall crime scene throughout the scene and are often critical to reconstruction is determining the chronological the overall analysis”. -
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The Journal of Perpetrator Research (JPR) is an Issue Editors inter-disciplinary, peer-reviewed, open access Dr Susanne C. Knittel (Utrecht University) journal committed to promoting the scholarly Dr Stéphanie Benzaquen-Gautier study of perpetrators of mass killings, political (University of Nottingham) violence, and genocide. The journal fosters scholarly discussions General Editors about perpetrators and perpetratorship across Dr Susanne C. Knittel (Utrecht University) the broader continuum of political violence. Dr Emiliano Perra (University of Winchester) JPR does not confine its attention to any Dr Uğur Ümit Üngör (Utrecht University) particular region or period. Instead, its mission is to provide a forum for analysis of perpetrators Advisory Board of genocide, mass killing and political violence Dr Stephanie Bird (UCL) via research taking place within the fields of Dr Tomislav Dulic (Uppsala University) history, criminology, law, forensics, cultural Prof. Mary Fulbrook (UCL) studies, sociology, anthropology, philosophy, Prof. Alexander L. Hinton (Rutgers University) memory studies, psychology, politics, litera- Prof. A. Dirk Moses (University of Sydney) ture, film studies and education. In providing Prof. Alette Smeulers (University of Tilburg) this interdisciplinary and cross-disciplinary Prof. Sue Vice (University of Sheffield) space the journal moves academic research on Prof. James Waller (Keene State College) this topic beyond, and between, disciplinary boundaries to provide a forum in which robust Copyeditor and interrogative research and cross-curricular Sofía Forchieri (Utrecht University) discourse can stimulate lively intellectual en- gagement with perpetrators. Layout & Typesetting JPR thus not only addresses issues related Sofía Forchieri (Utrecht University) to perpetrators in the past but also responds Dr Kári Driscoll (Utrecht University) to present challenges. -