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\section{Introduction}
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The nematode \textit{Caenorhabditis elegans} feeds by drawing bacteria suspended in liquid into its pharynx, a muscular organ that functions as a pump. The cycle of contraction and relaxation that
pumps in draws food from the environment and filters bacteria from liquid is referred to as pharyngeal pumping. About one out of four pharyngeal pumps is followed by a posterior moving peristaltic contraction that
pushes the transports food passed the pharyngeal corpus. This is referred to as isthmus peristalsis and, while coupled to pumping, it is distinctly regulated \cite{AveryHorvitz1987,WormBookFeedingAvery2012,song2013pharynx}. The rate of pumping is thus the primary indicator of food intake \cite[{Avery1993}.
The rate of pumping depend on feeding history, quality of food, and the familiarity of food [Shtonda and Avery, 2006, Song et al., 2013, Hobson et al., 2006]. Counting the stereotypical motion observed in the terminal bulb of the pharynx enabled detailed analyses of neuronal and molecular mechanisms that
regulated regulate pumping. However, these regulatory pathways were predominantly examined in
the presence of a stationary environment, containing a saturating high abundance of
familiar (familiar) bacteria on a standard agar plate. Moreover, traditional feeding assays rely on manual scoring of the mean number of pumps over brief (30-60 sec) intervals \cite{avery1989pharyngeal,raizen1995interacting,song2013recognition}.
The reduction of a potentially complex time-series to a single average rate may result in loss of pertinent information or even unintended bias.