diff --git a/cite.bib b/cite.bib
index 4a1beb9..cf3ad27 100644
--- a/cite.bib
+++ b/cite.bib
@@ -1,8 +1,371 @@
-@article{clemens2011,
- author = "Jan Clemens, Olaf Kutzki; Bernd Ronacher; Susanne Schreiber; Sandra Wohlgemuth",
- journal = "PNAS",
- volume = "108",
- number = "33",
- year = "2011",
- DOI = "https://doi.org/10.1073/pnas.1104506108",
+@article{balakrishnan2001song,
+ title={{Song pattern recognition in the grasshopper Chorthippus biguttulus: The mechanism of syllable onset and offset detection}},
+ author={Balakrishnan, Rohini and von Helversen, Dagmar and von Helversen, Otto},
+ journal={J Comp Physiol A},
+ volume={187},
+ pages={255--264},
+ year={2001},
}
+@article{bauer1987separate,
+ title={Separate localization of sound recognizing and sound producing neural mechanisms in a grasshopper},
+ author={Bauer, Maria and von Helversen, Otto},
+ journal={J Comp Physiol A},
+ volume={161},
+ pages={95--101},
+ year={1987},
+}
+@article{benda2008spike,
+ title={Spike-frequency adaptation generates intensity invariance in a primary auditory interneuron},
+ author={Benda, Jan and Hennig, R Matthias},
+ journal={J Comp Neurosci},
+ volume={24},
+ pages={113--136},
+ year={2008},
+}
+@article{bhavsar2017brain,
+ title={Brain regions for sound processing and song release in a small grasshopper},
+ author={Bhavsar, Mit Balvantray and Stumpner, Andreas and Heinrich, Ralf},
+ journal={J Insect Physiol},
+ volume={99},
+ pages={15--24},
+ year={2017},
+}
+@article{breckow1985mechanics,
+ title={Mechanics of the transduction of sound in the tympanal organ of adults and larvae of locusts},
+ author={Breckow, Joachim and Sippel, Martin},
+ journal={J Comp Physiol A},
+ volume={157},
+ pages={619--629},
+ year={1985},
+}
+@misc{cigliano2018orthoptera,
+ title={{Orthoptera Species File. Version 5.0/5.0}},
+ author={Cigliano, MM and Braun, H and Eades, DC and Otte, D},
+ year={2018}
+}
+@article{clemens2013computational,
+ title={Computational principles underlying the recognition of acoustic signals in insects},
+ author={Clemens, Jan and Hennig, R Matthias},
+ journal={J Comp Neurosci},
+ volume={35},
+ pages={75--85},
+ year={2013},
+}
+@article{clemens2011efficient,
+ title={Efficient transformation of an auditory population code in a small sensory system},
+ author={Clemens, Jan and Kutzki, Olaf and Ronacher, Bernhard and Schreiber, Susanne and Wohlgemuth, Sandra},
+ journal={PNAS},
+ volume={108},
+ pages={13812--13817},
+ year={2011},
+}
+@article{clemens2013feature,
+ title={Feature extraction and integration underlying perceptual decision making during courtship behavior},
+ author={Clemens, Jan and Ronacher, Bernhard},
+ journal={J Neurosci},
+ volume={33},
+ pages={12136--12145},
+ year={2013},
+}
+@article{clemens2012nonlinear,
+ title={Nonlinear computations underlying temporal and population sparseness in the auditory system of the grasshopper},
+ author={Clemens, Jan and Wohlgemuth, Sandra and Ronacher, Bernhard},
+ journal={J Neurosci},
+ volume={32},
+ pages={10053--10062},
+ year={2012},
+}
+@article{clemens2010intensity,
+ title={Intensity invariance properties of auditory neurons compared to the statistics of relevant natural signals in grasshoppers},
+ author={Clemens, Jan and Weschke, Gerroth and Vogel, Astrid and Ronacher, Bernhard},
+ journal={J Comp Physiol A},
+ volume={196},
+ pages={285--297},
+ year={2010},
+}
+@article{creutzig2010timescale,
+ title={Timescale-invariant pattern recognition by feedforward inhibition and parallel signal processing},
+ author={Creutzig, Felix and Benda, Jan and Wohlgemuth, Sandra and Stumpner, Andreas and Ronacher, Bernhard and Herz, Andreas VM},
+ journal={Neural Comput},
+ volume={22},
+ pages={1493--1510},
+ year={2010},
+}
+@article{creutzig2009timescale,
+ title={Timescale-invariant representation of acoustic communication signals by a bursting neuron},
+ author={Creutzig, Felix and Wohlgemuth, Sandra and Stumpner, Andreas and Benda, Jan and Ronacher, Bernhard and Herz, Andreas VM},
+ journal={J Neurosci},
+ volume={29},
+ pages={2575--2580},
+ year={2009},
+}
+@article{fisch2012channel,
+ title={Channel noise from both slow adaptation currents and fast currents is required to explain spike-response variability in a sensory neuron},
+ author={Fisch, Karin and Schwalger, Tilo and Lindner, Benjamin and Herz, Andreas VM and Benda, Jan},
+ journal={J Neurosci},
+ volume={32},
+ pages={17332--17344},
+ year={2012},
+}
+@article{gollisch2002energy,
+ title={Energy integration describes sound-intensity coding in an insect auditory system},
+ author={Gollisch, Tim and Sch{\"u}tze, Hartmut and Benda, Jan and Herz, Andreas VM},
+ journal={J Neurosci},
+ volume={22},
+ pages={10434--10448},
+ year={2002},
+}
+@article{hennig2014time,
+ title={Time and timing in the acoustic recognition system of crickets},
+ author={Hennig, R Matthias and Heller, Klaus-Gerhard and Clemens, Jan},
+ journal={Front Physiol},
+ volume={5},
+ pages={286},
+ year={2014},
+}
+@article{hildebrandt2009origin,
+ title={The origin of adaptation in the auditory pathway of locusts is specific to cell type and function},
+ author={Hildebrandt, K Jannis and Benda, Jan and Hennig, R Matthias},
+ journal={J Neurosci},
+ volume={29},
+ pages={2626--2636},
+ year={2009},
+}
+@article{hildebrandt2015neural,
+ title={A neural mechanism for time-window separation resolves ambiguity of adaptive coding},
+ author={Hildebrandt, K Jannis and Ronacher, Bernhard and Hennig, R Matthias and Benda, Jan},
+ journal={PLoS Biol},
+ volume={13},
+ pages={e1002096},
+ year={2015},
+}
+@article{hoy1996tympanal,
+ title={Tympanal hearing in insects},
+ author={Hoy, Ronald R and Robert, Daniel},
+ journal={Annu Rev Entomol},
+ volume={41},
+ pages={433--450},
+ year={1996},
+}
+@article{lang2000acoustic,
+ title={Acoustic communication distances of a gomphocerine grasshopper},
+ author={Lang, Friederike},
+ journal={Bioacoustics},
+ volume={10},
+ pages={233--258},
+ year={2000},
+}
+@article{machens2001discrimination,
+ title={Discrimination of behaviorally relevant signals by auditory receptor neurons},
+ author={Machens, Christian K and Prinz, P and Stemmler, Martin B and Ronacher, Bernhard and Herz, Andreas VM},
+ journal={Neurocomputing},
+ volume={38--40},
+ pages={263--268},
+ year={2001},
+}
+@article{machens2001representation,
+ title={Representation of acoustic communication signals by insect auditory receptor neurons},
+ author={Machens, Christian K and Stemmler, Martin B and Prinz, Petra and Krahe, R{\"u}diger and Ronacher, Bernhard and Herz, Andreas VM},
+ journal={J Neurosci},
+ volume={21},
+ pages={3215--3227},
+ year={2001},
+}
+@article{malkin2014energy,
+ title={Energy localization and frequency analysis in the locust ear},
+ author={Malkin, Robert and McDonagh, Thomas R and Mhatre, Natasha and Scott, Thomas S and Robert, Daniel},
+ journal={J R Soc Interface},
+ volume={11},
+ pages={20130857},
+ year={2014},
+}
+@article{michelsen1971physiology,
+ title={{The physiology of the locust ear: I. Frequency sensitivity of single cells in the isolated ear}},
+ author={Michelsen, Axel},
+ journal={Z vergl Physiologie},
+ volume={71},
+ pages={49--62},
+ year={1971},
+}
+@article{michelsen1971frequency,
+ title={{The physiology of the locust ear: II. Frequency discrimination based upon resonances in the tympanum}},
+ author={Michelsen, Axel},
+ journal={Z vergl Physiologie},
+ volume={71},
+ pages={63--101},
+ year={1971},
+}
+@article{neuhofer2008evolutionarily,
+ title={Evolutionarily conserved coding properties of auditory neurons across grasshopper species},
+ author={Neuhofer, Daniela and Wohlgemuth, Sandra and Stumpner, Andreas and Ronacher, Bernhard},
+ journal={Proc R Soc B},
+ volume={275},
+ pages={1965--1974},
+ year={2008},
+}
+@article{rehbein1976auditory,
+ title={Auditory neurons in the ventral cord of the locust: Morphological and functional properties},
+ author={Rehbein, Hansgeorg},
+ journal={J Comp Physiol A},
+ volume={110},
+ pages={233--250},
+ year={1976},
+}
+@article{romer1985responses,
+ title={Responses to model songs of auditory neurons in the thoracic ganglia and brain of the locust},
+ author={R{\"o}mer, Heiner and Seikowski, Ulrich},
+ journal={J Comp Physiol A},
+ volume={156},
+ pages={845--860},
+ year={1985},
+}
+@article{roemschied2014cell,
+ title={Cell-intrinsic mechanisms of temperature compensation in a grasshopper sensory receptor neuron},
+ author={R{\"o}mschied, Frederic A and Eberhard, Monika JB and Schleimer, Jan-Hendrik and Ronacher, Bernhard and Schreiber, Susanne},
+ journal={eLife},
+ volume={3},
+ pages={e02078},
+ year={2014},
+}
+@phdthesis{romschied2016neural,
+ title={Neural mechanisms of temperature compensation in an insect auditory system.},
+ author={R{\"o}mschied, Frederic Alexander},
+ school={Humboldt-Universit{\"a}t zu Berlin, Lebenswissenschaftliche Fakult{\"a}t},
+ year={2016},
+}
+@article{ronacher1986routes,
+ title={{Routes and stations in the processing of auditory directional information in the CNS of a grasshopper, as revealed by surgical experiments}},
+ author={Ronacher, Bernhard and Helversen, Dagmar v and Helversen, Otto v},
+ journal={J Comp Physiol A},
+ volume={158},
+ pages={363--374},
+ year={1986},
+}
+@article{ronacher2015computational,
+ title={Computational principles underlying recognition of acoustic signals in grasshoppers and crickets},
+ author={Ronacher, Bernhard and Hennig, R Matthias and Clemens, Jan},
+ journal={J Comp Physiol A},
+ volume={201},
+ pages={61--71},
+ year={2015},
+}
+@article{sevastianov2023evolution,
+ title={{Evolution of calling songs in the grasshopper subfamily Gomphocerinae (Orthoptera, Acrididae)}},
+ author={Sevastianov, Nikita and Neretina, Tatiana and Vedenina, Varvara},
+ journal={Zool Scr},
+ volume={52},
+ pages={154--175},
+ year={2023},
+}
+@article{stumpner1994song,
+ title={{Song production and song recognition in a group of sibling grasshopper species (Chorthippus dorsatus, Ch. dichrous and Ch. loratus: Orthoptera, Acrididae)}},
+ author={Stumpner, Andreas and von Helversen, Otto},
+ journal={Bioacoustics},
+ volume={6},
+ pages={1--23},
+ year={1994},
+}
+@article{suga1960peripheral,
+ title={Peripheral mechanism of hearing in locust},
+ author={Suga, Nobuo},
+ journal={Jpn J Physiol},
+ volume={10},
+ pages={533--546},
+ year={1960},
+}
+@article{tarasova2021biguttulus,
+ title={{Songs and morphology in three species of the Chorthippus biguttulus group (Orthoptera, Acrididae, Gomphocerinae) in Russia and adjacent countries}},
+ author={Tarasova, Tatiana and Tishechkin, Dmitry and Vedenina, Varvara},
+ journal={Zookeys},
+ volume={1073},
+ pages={21--53},
+ year={2021},
+}
+@article{tarasova2021eurasius,
+ title={{Songs and morphology in grasshoppers of the Stenobothrus eurasius group (Orthoptera: Acrdidae: Gomphocerinae) from Russia and adjacent countries: clarifying of taxonomic status}},
+ author={Tarasova, Tatiana A and Sevastianov, Nikita S and Vedenina, Varvara Yu},
+ journal={Zootaxa},
+ volume={4965},
+ pages={244--260},
+ year={2021},
+}
+@article{tishechkin2016acoustic,
+ title={Acoustic signals in insects: A reproductive barrier and a taxonomic character},
+ author={Tishechkin, D Yu and Vedenina, V Yu},
+ journal={Entomol Rev},
+ volume={96},
+ pages={1127--1164},
+ year={2016},
+}
+@article{vedenina2014stable,
+ title={{Stable and variable parameters in courtship songs of grasshoppers of the subfamily Gomphocerinae (Orthoptera, Acrididae)}},
+ author={Vedenina, V Yu and Shestakov, LS},
+ journal={Entomol Rev},
+ volume={94},
+ pages={1--20},
+ year={2014},
+}
+@article{vedenina2003complex,
+ title={Complex courtship in a bimodal grasshopper hybrid zone},
+ author={Vedenina, V Yu and von Helversen, O},
+ journal={Behav Ecol Sociobiol},
+ volume={54},
+ pages={44--54},
+ year={2003},
+}
+@article{vedenina2011speciation,
+ title={Speciation in gomphocerine grasshoppers: Molecular phylogeny versus bioacoustics and courtship behavior},
+ author={Vedenina, Varvara Yu and Mugue, Nikolay},
+ journal={J Orthoptera Res},
+ volume={20},
+ pages={109--125},
+ year={2011},
+}
+@article{vedenina2013narrow,
+ title={{A narrow hybrid zone between the grasshoppers Stenobothrus clavatus and Stenobothrus rubicundus (Orthoptera: Gomphocerinae): Female preferences for courtship songs}},
+ author={Vedenina, Varvara Yu and F{\"a}hsing, Sylvia and Sradnick, Jan and Kl{\"o}pfel, Anja and Elsner, Norbert},
+ journal={Biol J Linn Soc Lond},
+ volume={108},
+ pages={834--843},
+ year={2013},
+}
+@article{von1984parallel,
+ title={{Parallel processing in auditory pattern recognition and directional analysis by the grasshopper Chorthippus biguttulus L. (Acrididae)}},
+ author={von Helversen, Dagmar},
+ journal={J Comp Physiol A},
+ volume={154},
+ pages={837--846},
+ year={1984},
+}
+@article{von1993absolute,
+ title={{‘Absolute steepness’ of ramps as an essential cue for auditory pattern recognition by a grasshopper (Orthoptera; Acrididae; Chorthippus biguttulus L.)}},
+ author={von Helversen, Dagmar},
+ journal={J Comp Physiol A},
+ volume={172},
+ pages={633--639},
+ year={1993},
+}
+@article{von2004acoustic,
+ title={{Acoustic communication in a duetting grasshopper: Receiver response variability, male strategies and signal design}},
+ author={von Helversen, Dagmar and Balakrishnan, Rohini and von Helversen, Otto},
+ journal={Anim Behav},
+ volume={68},
+ pages={131--144},
+ year={2004},
+}
+@article{von1977stridulatory,
+ title={The stridulatory movements of acridid grasshoppers recorded with an opto-electronic device},
+ author={von Helversen, Otto and Elsner, Norbert},
+ journal={J Comp Physiol A},
+ volume={122},
+ pages={53--64},
+ year={1977},
+}
+@article{windmill2008time,
+ title={Time-resolved tympanal mechanics of the locust},
+ author={Windmill, JFC and Bockenhauer, S and Robert, D},
+ journal={J R Soc Interface},
+ volume={5},
+ pages={1435--1443},
+ year={2008},
+}
\ No newline at end of file
diff --git a/figures/grasshopper_sketch.svg b/figures/grasshopper_sketch.svg
new file mode 100644
index 0000000..85929bc
--- /dev/null
+++ b/figures/grasshopper_sketch.svg
@@ -0,0 +1,876 @@
+
+
+
+
diff --git a/figures/grasshopper_sketch_full.svg b/figures/grasshopper_sketch_full.svg
new file mode 100644
index 0000000..5a234ee
--- /dev/null
+++ b/figures/grasshopper_sketch_full.svg
@@ -0,0 +1,1093 @@
+
+
+
+
diff --git a/figures/grasshopper_sketch_half.svg b/figures/grasshopper_sketch_half.svg
new file mode 100644
index 0000000..dd4eecd
--- /dev/null
+++ b/figures/grasshopper_sketch_half.svg
@@ -0,0 +1,1066 @@
+
+
+
+
diff --git a/figures/grasshopper_sketch_half_backup.svg b/figures/grasshopper_sketch_half_backup.svg
new file mode 100644
index 0000000..d347d60
--- /dev/null
+++ b/figures/grasshopper_sketch_half_backup.svg
@@ -0,0 +1,510 @@
+
+
+
+
diff --git a/main.aux b/main.aux
index b04ffb0..f202e14 100644
--- a/main.aux
+++ b/main.aux
@@ -1,35 +1,44 @@
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index 43be07f..bc24ec6 100644
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+ \field{year}{2013}
+ \field{pages}{12136\bibrangedash 12145}
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+ \field{title}{Computational principles underlying recognition of acoustic signals in grasshoppers and crickets}
+ \field{volume}{201}
+ \field{year}{2015}
+ \field{pages}{61\bibrangedash 71}
+ \range{pages}{11}
\endentry
\enddatalist
\endrefsection
diff --git a/main.bbl-SAVE-ERROR b/main.bbl-SAVE-ERROR
index 43be07f..bc24ec6 100644
--- a/main.bbl-SAVE-ERROR
+++ b/main.bbl-SAVE-ERROR
@@ -19,33 +19,165 @@
\refsection{0}
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+ \field{journaltitle}{J Comp Neurosci}
+ \field{title}{Computational principles underlying the recognition of acoustic signals in insects}
+ \field{volume}{35}
+ \field{year}{2013}
+ \field{pages}{75\bibrangedash 85}
+ \range{pages}{11}
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- \endverb
+ \field{pages}{13812\bibrangedash 13817}
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+ \entry{clemens2013feature}{article}{}
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+ \field{title}{Computational principles underlying recognition of acoustic signals in grasshoppers and crickets}
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+ \field{pages}{61\bibrangedash 71}
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\endentry
\enddatalist
\endrefsection
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index c3a9289..1ee8e73 100644
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- clemens2011
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+ clemens2013feature
+ ronacher2015computational
+ clemens2011efficient
+ clemens2011efficient
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diff --git a/main.tex b/main.tex
index fa64d5b..ba006cf 100644
--- a/main.tex
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@@ -43,7 +43,7 @@ style=authoryear,
\newcommand{\pc}{p(c_i,\,T)} % Probability density (general interval)
\newcommand{\pclp}{p(c_i,\,\tlp)} % Probability density (lowpass interval)
-\section{The sensory world of a grasshopper}
+\section{Exploring a grashopper's sensory world}
Strong dependence on acoustic signals for ranged communication\\
- Diverse species-specific sound repertoires and production mechanisms\\
@@ -87,6 +87,19 @@ How can a human observer conceive a grasshopper's auditory percepts?\\
- How to integrate the available knowledge on anatomy, physiology, ethology?\\
$\rightarrow$ Abstract, simplify, formalize $\rightarrow$ Functional model framework
+\textbf{Precursor work for model construction (special thanks to authors):}
+
+Linear-nonlinear modelling of behavioral responses to artificial songs\\
+- Feature expansion as implemented in our model: Major contribution!\\
+- Bank of linear filters, nonlinearity, temporal integration, feature weighting\\
+$\rightarrow$ \cite{clemens2013computational} (crickets)\\
+$\rightarrow$ \cite{clemens2013feature} (grasshoppers)\\
+$\rightarrow$ \cite{ronacher2015computational}\\
+\textbf{Own advancements/key differences}:\\
+1) Used boxcar functions as artificial "songs" (focus on few key parameters)\\
+$\rightarrow$ Now actual, variable songs (as naturalistic as possible)\\
+2) Fitted filters to behavioral data\\
+$\rightarrow$ More general, simpler, unfitted formalized Gabor filter bank
\section{Developing a functional model of\\the grasshopper auditory pathway}
@@ -96,7 +109,7 @@ $\rightarrow$ Abstract, simplify, formalize $\rightarrow$ Functional model frame
"Pre-split portion" of the auditory pathway:\\
Tympanal membrane $\rightarrow$ Receptor neurons $\rightarrow$ Local interneurons
-Similar response/filter properties within receptor/interneuron populations (\cite{clemens2011})\\
+Similar response/filter properties within receptor/interneuron populations (\cite{clemens2011efficient})\\
$\rightarrow$ One population-wide response trace per stage (no "single-cell resolution")
\textbf{Stage-specific processing steps and functional approximations:}
@@ -140,7 +153,7 @@ $\rightarrow$ Highpass filter 10 Hz
"Post-split portion" of the auditory pathway:\\
Ascending neurons (AN) $\rightarrow$ Central brain neurons
-Diverse response/filter properties within AN population (\cite{clemens2011})\\
+Diverse response/filter properties within AN population (\cite{clemens2011efficient})\\
- Pathway splitting into several parallel branches\\
- Expansion into a decorrelated higher-dimensional sound representation\\
$\rightarrow$ Individual neuron-specific response traces from this stage onwards
@@ -327,18 +340,29 @@ duty cycle-encoding quantity, mediated by threshold function $\nl$
on the magnitude of the derivative of $c_i(t)$ in temporal proximity to time
points at which $c_i(t)$ crosses threshold value $\thr$\\
$\rightarrow$ The steeper the slope of $c_i(t)$, the less $T_1$ changes with scale variations\\
-$\rightarrow$ Extreme amplitudes of $c_i(t)$ (peaks/troughs)
+$\rightarrow$ If $T_1$ is invariant to scale variation in $c_i(t)$, then so is $\feat(t)$
-$\rightarrow$ Only amplitudes of \\
-$\rightarrow$ Absolute amplitudes of peaks/troughs of $c_i(t)$ \\
-$\rightarrow$ Acuity of peaks/troughs in $c_i(t)$ matters, not their absolute amplitude
-
-- From graded stimulus to categorical behavioral decision:\\
+- Suggests a relatively simple rule for optimal choice of threshold value $\thr$:\\
+$\rightarrow$ Find amplitude $c_i$ that maximizes absolute derivative of $c_i(t)$ over time\\
+$\rightarrow$ Optimal with respect to intensity invariance of $\feat(t)$, not necessarily for
+other criteria such as song-noise separation or diversity between features
+- Nonlinear operations can be used to detach representations from graded physical
+stimulus (to fasciliate categorical behavioral decision-making?):\\
+1) Capture sufficiently precise amplitude information: $\env(t)$, $\adapt(t)$\\
+$\rightarrow$ Closely following the AM of the acoustic stimulus\\
+2) Quantify relevant stimulus properties on a graded scale: $c_i(t)$\\
+$\rightarrow$ More decorrelated representation, compared to prior stages\\
+3) Nonlinearity: Distinguish between "relevant vs irrelevant" values: $\bi(t)$\\
+$\rightarrow$ Trading a graded scale for two or more categorical states\\
+4) Represent stimulus properties under relevance constraint: $\feat(t)$\\
+$\rightarrow$ Graded again but highly decorrelated from the acoustic stimulus\\
+5) Categorical behavioral decision-making requires further nonlinearities\\
+$\rightarrow$ Parameters of a behavioral response may be graded (e.g. approach speed),
+initiation of one behavior over another is categorical (e.g. approach/stay)
\section{Discriminating species-specific song\\patterns in feature space}
-
\section{Conclusions \& outlook}
\end{document}
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