rebuid results and started bainstoming for the introduction
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\bibitem[Henninger et~al., 2018]{Henninger2018}
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Henninger, J., Krahe, R., Kirschbaum, F., Grewe, J., and Benda, J. (2018).
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\newblock Statistics of natural communication signals observed in the wild
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identify important yet neglected stimulus regimes in weakly electric fish.
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\newblock {\em Journal of Neuroscience}.
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\bibitem[Todd and Andrews, 1999]{TODD1999322}
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Todd, B.~S. and Andrews, D.~C. (1999).
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\newblock The identification of peaks in physiological signals.
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\newblock {\em Computers and Biomedical Research}, 32(4):322 -- 335.
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\BOOKMARK [2][-]{subsection*.3}{Field site}{section*.2}% 3
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\BOOKMARK [2][-]{subsection*.4}{Field monitiring system}{section*.2}% 4
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\BOOKMARK [2][-]{subsection*.5}{Extraction of EOD frequencies}{section*.2}% 5
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\end{abstract}
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\section{Introduction}
|
||||
work in progress
|
||||
|
||||
Across animal species we can observe varriouse social structures and species dependent behaviours. While some species permanently life in larger groups (\textbf{chimpanses, wolves, etc.}) others prefere to stay solitary (\textbf{cats, etc.}) or from groups only under certain circumstances (\textbf{mating on parrots, migrating birds?}). In some species we can find a strict hierarchical orders (\textbf{lions, etc.}), while in others no hierachical systematic can be observed. Similar varriaties can be found for mating rituals, migrating behaviour, etc. However, each species adapted to its ecological niche and developed behaviour most beneficial for its way of life. Many of those spcies dependent behavious are pretty complex and occure over large time spans. Furthermore, animal behaviour is ea
|
||||
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||||
% challenges of tracking whole populations in natural conditions.
|
||||
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||||
% tracking undisturbed, naural behaviour of animals.
|
||||
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||||
% tracking methods using tagging.
|
||||
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||||
% longterm observations.
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||||
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||||
% the electric fish and its advatage for undisturbed behaviour tracking.
|
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||||
% what did we do.
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||||
\pagebreak
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\section{Materials and Methods}
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@ -132,45 +146,58 @@ The study site was a small stream called Rio Rubiano in the Colombian part of tr
|
||||
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||||
\subsection{Field monitiring system}
|
||||
|
||||
The recording system used to obtain our date is similar to the one used by [Henninger et al. (2018)] in the Republic of Panamá. It consists of a custom-build 64-channel electrode and amplifier system (npi electronics GmbH, Tamm, Germany) powered by 12\,V car batteries. Signals detected by the electrodes (low-noise headstages embeded in epoxy resin (1 $\times$ gain, 10 $\times$ 5 $\times$ 5\,mm)) were amplified by the main amplifier (100 $\times$ gain, 1st order high-pass filter 100\,Hz, low-pass 10\,kHz) before being digitalized with 20\,kHz per channel with 16-bit amplitude resolution using a custom build computer with two digital-analog converter cards (PCI-6259, National Instruments, Austin, Texas, USA). Data acquisition and storage for offline analysis were managed by a custom software written in C++ (https://github.com/bendalab/fishgrid). The maximum of 64 electrodes mounted on 8 PVC tubes were arranged in an 8 by 8 electrode grid (50 cm spacing) covering an area of 350$\times$350\,cm. All 64 electrodes were used throughout the whole recording period. Each PVC tube, equipped with 8 electrodes got tied to a rope crossing the river, forming a structure allowing small shifts in electrode distance but being resilient to destruction by rapidly changing environmental factors, i.e. rising water levels after heavy rainfall.
|
||||
The recording system used to obtain our date is similar to the one used by \citep{Henninger2018} in the Republic of Panamá. It consists of a custom-build 64-channel electrode and amplifier system (npi electronics GmbH, Tamm, Germany) powered by 12\,V car batteries. Signals detected by the electrodes (low-noise headstages embeded in epoxy resin (1 $\times$ gain, 10 $\times$ 5 $\times$ 5\,mm)) were amplified by the main amplifier (100 $\times$ gain, 1st order high-pass filter 100\,Hz, low-pass 10\,kHz) before being digitalized with 20\,kHz per channel with 16-bit amplitude resolution using a custom build computer with two digital-analog converter cards (PCI-6259, National Instruments, Austin, Texas, USA). Data acquisition and storage for offline analysis were managed by a custom software written in C++ (https://github.com/bendalab/fishgrid). The maximum of 64 electrodes mounted on 8 PVC tubes were arranged in an 8 by 8 electrode grid (50 cm spacing) covering an area of 350$\times$350\,cm. All 64 electrodes were used throughout the whole recording period. Each PVC tube, equipped with 8 electrodes got tied to a rope crossing the river, forming a structure allowing small shifts in electrode distance but being resilient to destruction by rapidly changing environmental factors, i.e. rising water levels after heavy rainfall.
|
||||
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||||
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||||
\subsection{Extraction of EOD frequencies}
|
||||
|
||||
Different species of wavetype weakly electric fish and even individuals within the same species show individual EOD frequencies. We use fast fourier transformations of 95$\%$ overlapping data snippets of 2 seconds to evaluated the frequency composition of each recording channel, i.e. recording electrode, consistent troughout our recordings. Since EODs of wavetype weakly electric fish are composed of a fundamental discharge frequency and its harminics, we detect peaks in the sum of the powerspectra and assign them in groups of fundamental and harmonic frequencies. Fundamental EOD frequnecies as well as their powers in the powerspectra of the different electrodes and the respective time of detection is stored for further analysis.
|
||||
Different species of wavetype weakly electric fish and even individuals within the same species show individual EOD frequencies. We use fast fourier transformations of 95$\%$ overlapping data snippets of 2 seconds to evaluated the frequency composition of each recording channel, i.e. recording electrode, consistent troughout our recordings. Since EODs of wavetype weakly electric fish are composed of a fundamental discharge frequency and its harminics, we detect peaks in the sum of the powerspectra using the Todd algorithm \citep{TODD1999322} and assign them in groups of fundamental and harmonic frequencies. Fundamental EOD frequnecies as well as their powers in the powerspectra of the different electrodes and the respective time of detection is stored for further analysis.
|
||||
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||||
\subsection{EOD frequency tracking}
|
||||
|
||||
To obtain individual EOD signal traces we developed a tracking algorithm based on the difference of individual EOD signal parameters. We converted accual EOD frequency difference and EOD field differences of potential EOD signal pairs into normed error values and calcualted total signal errors using a cost-function (eq. \eqref{sig.error}) representing the likelyhood of potential EOD signal pairs to originate from the same individual, whereby EOD signal pairs showing smaller errors represent signal pairs more likely originating from the same individual.
|
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\begin{equation}\label{sig.error}
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||||
sig.error = \dfrac{2}{3} * \Delta field + \dfrac{1}{3} * \Delta EODf
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\end{equation}
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\section{Results}
|
||||
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||||
We succesfully recorded the electric signals of a population of weakly electric fish for 14 consecutive days. In the attempt to track the electric and spatio-temporal behaviour of single individuals of the observerd population we developed a algorithm capable of tracking individual behaviour without the necessity of tagging, even when single parameters of the EOD signals, e.g. EOD frequencies, are temporary very similar between individuals.
|
||||
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||||
\subsection{Tracking of individual EODs}
|
||||
%In order to track individual EOD frequency traces for each individual recorded we developed an algorithm based on Python3 using two independent signal variables to reliable assign EOD frequency traces.
|
||||
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In order to deduct individual EOD frequency traces from the extraced EOD frequencies we considered various tracking techniques and finally developed a reliable tracking algorithm based on EOD frequency and field structures comparison.
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The developed and applied tracking algorithms relies on two EOD signal parameters, the EOD frequency difference and the overall EOD field structure similarity of potential EOD signal pairs. Potential EOD signal pairs are constrained by a maximum EOD frequnecy difference and a maximum time difference between the respective EOD signals. For each potential EOD signal pair, EOD frequency difference and EOD field structue difference is determined and evaluated in a cost-function (see Methods: eq. \eqref{sig.error}) resulting in total signal errors. EOD signal pairs are assigned to indidual fish based on their total signal error in the two-staged sorting algorithm.
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\subsubsection{$\Delta$-EODf (Electric organ discharge frequency difference)}
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\subsubsection{EOD signal tracking parameter: $\Delta$-EODf (EOD frequency difference)}
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\begin{figure}[h!]
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\centerline{\includegraphics[width=1.\linewidth]{3}}
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\caption{\label{dEODf} Spectrogram and part of EOD frequency traces from EOD signals of multiple fish including two EOD frequency traces crossing in the course of an EOD frequency rise. Single EOD signals marked in green and yellow form potential candidates to be connected to the EOD signal marked in black. The yellow and green bar represent the respective EOD frequency errors $\Delta f_0$ and $\Delta f_1$, as part of the tracking algorithm.}
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\end{figure}
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Since, the EOD frequency of wave-type weakly electric fish represent on of the most stable oscillating signals known across natural systems and, thus, keeps stable for long periods of time it seems unambiguous to use this signal parameter as main tracking criterion. However, tracking individual EOD frequencies over long periods of time gives rise to further challenges. When wave-type weakly electric fish produce communication signals, such as EOD frequency rises, EOD frequency traces of different individuals frequently cross each other, sometimes multiple times within a short time window. This specially occurs in larger groups of wave-type weakly electric fish. These EOD frequency trace crossings give rise to several algorithmic problems. First, detecting both peaks during the Powerspectrum analysis in the very moment of the EOD frequency traces crossing often fails resulting in missing datapoints for one EOD frequency trace. As a result, correct tracking of EOD frequency traces, only based on EOD frequency comparison, is at chance level during these crossing events.
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Since, the EOD frequency of wave-type weakly electric fish represent on of the most stable oscillating signals known across natural systems and, thus, keeps stable for long periods of time it seems unambiguous to use this signal parameter as main tracking criterion. However, tracking individual EOD frequencies over long periods of time gives rise to further challenges. When wave-type weakly electric fish produce communication signals, such as EOD frequency rises, EOD frequency traces of different individuals frequently cross each other, sometimes multiple times within a short time window (see fig. \ref{tmp_idents} \& \ref{running_connection}). This specially occurs in larger groups of wave-type weakly electric fish where fish density is increased and, consequently EOD frequency differences between individuals are decreased. Crossing EOD frequency trace give rise to several algorithmic problems. Detecting both peaks during the Powerspectrum analysis in the very moment of the EOD frequency traces crossing often fails resulting in missing datapoints for one EOD frequency trace. Consequently, correct tracking of crossing EOD frequency traces using only EOD frequency as tracking parameter is at chance level.
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\subsubsection{$\Delta$-F (Field difference)}
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\subsubsection{EOD signal tracking paramete: $\Delta$-F (EOD field difference)}
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\begin{figure}[h!]
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\centerline{\includegraphics[width=1.\linewidth]{9}}
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\caption{\label{dField} Electric field properties deducted from EOD frequency power on different electrodes of potential partners in the course of tracking, respective to fig.\ref{dEODf}. Field properties on the left (green and yellow signal in fig.\ref{dEODf}) are compared to the field properies on the right (black signal in fig.\ref{dEODf}). The centered top field difference results from the substraction of the field properties of the green and black signal in fig.\ref{dEODf}, the centered bottom respectively the difference between the yellow and black signal. $\Delta field_0$ and $\Delta field_1$ represent the mean-square error of the respective difle differences.}
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\caption{\label{dField} Electric field properties deducted from EOD frequency power on different electrodes of potential partners in the course of tracking, respective to fig.\ref{dEODf}. Field properties on the left (green and yellow signal in fig.\ref{dEODf}) are compared to the field properies on the right (black signal in fig.\ref{dEODf}). The centered top field difference results from the substraction of the field properties of the green and black signal in fig.\ref{dEODf}, the centered bottom respectively the difference between the yellow and black signal. $\Delta field_0$ and $\Delta field_1$ represent the root-mean-square-error of the respective difle differences.}
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\end{figure}
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||||
|
||||
To address EOD frequency tracking errors arising from crossing EOD frequency traces, e.g. during the events of EOD frequency rises, we use the individual absolute fields properties as second tracking parameter. Due to our multi electrode recoding setup we are able to estimate the strength of each individual EOD signal at multiple locations within our electrode-grid by extracting the power of the according EOD frequency in the Powerspectrum of each electrode. These two-dimensional representations of the electric fields vary between individuals depending on their very location within the electrode-grid. After normalizing the individual electric fields to eliminate the impact of absolute field strength the obtained field proportions can be used as a second tracking parameter by calculation of the difference between two field proportions using the mean-square-error of different field proportions.
|
||||
The quasi-sinusoidal EODs of weakly electric fish creates individual dipole field surrounding each fish. Due to our multi-electrode recoding setup we are able to reconsturct the individual electric fields by extracting the strength of individual EOD frequencies in the powerspectra of the data recorded by the different electrodes, i.e. at multiple locations within our electrode-grid. These two-dimensional representations of the electric fields vary between individuals depending on their very location within the electrode-grid. We use the root-mean-square-error of two EOD fields, i.e. the EOD field difference, of two EOD fields to campare the EOD field extents and, thus, obtain an additional tracking parameter independent from EOD frequency enabling us to even track crossing EOD frequency traces, e.g. during the event of EOD frequency rises.
|
||||
|
||||
\subsubsection{Error values composed from $\Delta$-EODf and $\Delta$-Field}
|
||||
|
||||
The simple comparison of EOD frequency difference and field structure difference is not sufficient to determine the likelihood of two signals originating from the same individual. Therefore, relative EOD frequency errors and relative field errors, both ranging between 0 and 1, are calculated.
|
||||
We converte the absoute values of EOD frequency difference and EOD field difference into relative error values, both ranging from 0 to 1, and calculate the total signal error using a cost-funktion (see Methods eq. \eqref{sig.error}) representing the likelyhood of two signals to originate from the same individual.
|
||||
|
||||
\begin{figure}[h!]
|
||||
\centerline{\includegraphics[width=1.\linewidth]{10}}
|
||||
\caption{\label{rel_errors} Determination of relative field and EOD frequency errors. Up: All possible field errors of signals within a time window of 30\,s (3 $\times$ compare range) showing a maximum EOD frequency differen of 10\,Hz were colected as possible field error distribution. Its cumulative sum histogram is displayed in red. Relative field errors for both, $\Delta field_0$ and $\Delta field_1$, are difined as the proportion of possible field errors smaller than the respective field errors. Smaller field errors result in smaller relative field errors and, thus, increase the likelihood of two signals belonging to one identity. Down: Relative frequency errors are calculated based on a boltzmann function. Relative frequency errors above 1\,Hz already represent a special event within a EOD frequency trace and, thus, result in the maximum relative frequency error.}
|
||||
\end{figure}
|
||||
|
||||
% continue the results here !!!
|
||||
|
||||
\subsubsection{Frequency error determination}
|
||||
|
||||
With respect to EOD frequency differences we assume EOD frequency differences of above 1 Hz to be equally unlike to originate from the same individual and, thus, result in the maximum relative EOD frequency error. EOD frequencies below 1 Hz result in smaller relative EOD frequency errors and are calculated from a Boltzmann-function resulting in smaller relative EOD frequency difference the lower the real EOD frequency difference is.
|
||||
@ -206,8 +233,6 @@ The assembly of the center 10 seconds of the temporal identities, containing val
|
||||
\caption{\label{running_connection} Running connection. A: Temporal identities assigned via lowest error value connections. The black and grey bars together indicate the whole data snippet temporal identities have been assigned before. Connections within the grey areas are assumed to be unsteady since signals within compare range but outside the gray are could point to those signals as well but are neglected in this particular temporal identity assignment. Connections within the black bar area indicate valid connections since every signal possible connected to those signals lie within the temporal assignment range. B: Already assigned identities, i.e. potential connection partners for the temporal identities to assigne, are shown. C: The yellow and green signals (already discussed in fig. \ref{dEODf} and fig. \ref{dField}) represent the origin signals of the respective identities to best fit to a signal of one temporal identity, indicated in black. The yellow-to-black error is lower than the green-to-black error. D: Signals of temporal identities got assigned to signals of already assigned identities based on their lowest error value to each other.}
|
||||
\end{figure}
|
||||
|
||||
\pagebreak
|
||||
\section{Results}
|
||||
|
||||
\subsection{d-EODf and d-Field of same identity signals vs. non-same identity signals}
|
||||
|
||||
@ -237,4 +262,9 @@ To further validate the use of the tracking parameters we carried out ROC analys
|
||||
\caption{\label{ROC} Random caption}
|
||||
\end{figure}
|
||||
|
||||
\clearpage
|
||||
\bibliography{bibliography}
|
||||
|
||||
\bibliographystyle{apalike}
|
||||
|
||||
\end{document}
|
||||
|
||||
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Reference in New Issue
Block a user