Stock market models help researchers predict animal behavior -- ScienceDaily
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Featured Researchfrom universities, journals, and other organizationsStock market models help researchers predict animal behaviorDate:November 12, 2014Source:New York University Polytechnic School of EngineeringSummary:Modeling used to forecast fluctuations in the stock market has been discovered to predict aspects of animal behavior. The movement of zebrafish when mapped is very similar to the stochastic jump process, a mathematical model used by financial engineers. The model could improve the effectiveness of experiments, minimize the number of fish used, and allow researchers to make better use of their data following experiments.Share This Email to a friend Facebook Twitter LinkedIn Google+ Print this page
Zebrafish.Credit: Image courtesy of New York University Polytechnic School of Engineering[Click to enlarge image]In an unexpected mashup of financial and mechanical engineering, researchers have discovered that the same modeling used to forecast fluctuations in the stock market can be used to predict aspects of animal behavior. Their work proposes an unprecedented model for in silico -- or computer-based -- simulations of animal behavior. The findings were published in the Journal of the Royal Society Interface.
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The team, led by Maurizio Porfiri, professor of mechanical and aerospace engineering and director of the school's Dynamical Systems Laboratory, is more accustomed to studying the social behavior of zebrafish -- a freshwater species often used in experiments due to its genetic similarity to humans. Porfiri has drawn considerable attention for his interdisciplinary research on the factors that influence zebrafish collective behavior.
However, designing procedures and conditions for animal experiments are time-intensive, and despite careful planning, many experiments yield mixed data. Porfiri and his team, comprising postdoctoral fellow Ross P. Anderson, doctoral student Violet Mwaffo, and former postdoctoral fellow Sachit Butail (now assistant professor at Indraprastha Institute of Information Technology Delhi), set out to develop a mathematical model of animal behavior that could predict the outcome or improve the effectiveness of experiments and minimize the number of fish used in them.
When mapping the movement of zebrafish as they swam, Porfiri and his colleagues observed that the species does not move in a continuous pattern; rather, it swims in a signature style characterized by coasting periods followed by sharp turns. As they plotted the turn rate of the fish over time, the researchers noticed that their data, with its small variations followed by large dips (reflecting fast turns), looked very different from the turn rate of other fish but very similar to another type of data, where such volatility is not only common but well studied: the stock market.
The team embraced the mathematical model known as a stochastic jump process, a term used by financial engineers and economists to describe the price jumps of financial assets over time. Using many of the same tools employed in financial analysis, the researchers were able to create a mathematical model of zebrafish swimming, mining video footage from previous experimental sessions to seed what they hope will become a robust database of zebrafish behavior under varying circumstances.
"We realized that if we could simulate the swimming behavior of these fish using a computer, we could test and predict their responses to new stimuli, whether that is the introduction or removal of a shoal mate, the presence of a robotic fish, or even exposure to alcohol," Porfiri said. "In behavior studies, you can easily utilize thousands of test subjects to explore different variables. This will allow researchers to replace some of that experimentation with computer modeling."
Porfiri emphasized that this mathematical model of animal behavior will also allow researchers to make better use of their data following experiments, not just beforehand. "The data that result from zebrafish experiments look quite messy initially," Porfiri said. "Giving researchers a model they can use to compare, filter, and refine their analysis afterwards will allow them to maximize data for better results."
Porfiri and his team plan to continue to add data to their model with the hope of creating a toolbox that all researchers engaged in this field of study can utilize.
The idea of incorporating financial engineering to model zebrafish behavior came from Mwaffo, now a doctoral student in Porfiri's lab who had earned his master's degree in financial engineering from the NYU Polytechnic School of Engineering.
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The above story is based on materials provided by New York University Polytechnic School of Engineering. Note: Materials may be edited for content and length.
Journal Reference:
V. Mwaffo, R. P. Anderson, S. Butail, M. Porfiri. A jump persistent turning walker to model zebrafish locomotion. Journal of The Royal Society Interface, 2014; 12 (102): 20140884 DOI: 10.1098/%u200Brsif.2014.0884Cite This Page:
MLA APA ChicagoNew York University Polytechnic School of Engineering. "Stock market models help researchers predict animal behavior." ScienceDaily. ScienceDaily, 12 November 2014.
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