top of page

Estimating Occult Timing of Surprise Gunshot Sounds in Silent Film via Observed Start of Human Vol..

Brian Roselle & Kenneth Scearce


Abstract: Voluntary human reactions, and associated perception times when reaction movements commence, are identified to estimate gunshot sound arrival time to subjects in a shooting scenario recorded on silent film. Common involuntary reactions (startle) and voluntary reactions are reviewed to help identify proper reaction types being observed and apply in back-calculating gunshot timing. With a focus on voluntary reactions, values for perception time as a function of stimulus expectancy, specifically in the case of a surprise stimulus, are determined by reapplication of brake perception-reaction time (brake PRT) modeling of extensive driver reaction time studies in traffic flow theory. Using a modified model in conjunction with sampling human reactions observed on film allows back-calculating surprise gunshot sound timing. To detail use of this approach, a well-known example of a silent film, the Abraham Zapruder film of the Kennedy shooting, is considered to help identify the first shot timing in that case.


78 views

Recent Posts

See All

Comments


bottom of page