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Grinding through methods (WIP).

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19
cite.bib
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@ -182,7 +182,7 @@
volume={32},
pages={17332--17344},
year={2012},
}
}# Cited
@article{gollisch2002energy,
title={Energy integration describes sound-intensity coding in an insect auditory system},
@ -193,6 +193,17 @@
year={2002},
}# Cited
@article{gollisch2004input,
title={Input-driven components of spike-frequency adaptation can be unmasked in vivo},
author={Gollisch, Tim and Herz, Andreas VM},
journal={Journal of Neuroscience},
volume={24},
number={34},
pages={7435--7444},
year={2004},
publisher={Society for Neuroscience}
}# Cited
@article{gray1960fine,
title={The fine structure of the insect ear},
author={Gray, Edward George},
@ -403,7 +414,8 @@
volume={10},
pages={233--258},
year={2000},
}
}# Cited
@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},
@ -466,8 +478,7 @@
volume={71},
pages={63--101},
year={1971},
}# Cited
}
@incollection{michelsen1978sound,
title={Sound reception in different environments},
author={Michelsen, Axel},

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literature/Gollisch_Herz_2004.pdf Normal file
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67
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@ -78,12 +78,14 @@
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@ -729,8 +729,46 @@
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\field{title}{{The physiology of the locust ear: II. Frequency discrimination based upon resonances in the tympanum}}
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@ -1393,7 +1441,6 @@
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48
main.bcf
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@ -2397,38 +2397,40 @@
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<bcf:citekey order="50" intorder="1">rehbein1974structure</bcf:citekey>
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<bcf:citekey order="53" intorder="1">gray1960fine</bcf:citekey>
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<bcf:citekey order="51" intorder="1">rehbein1974structure</bcf:citekey>
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<bcf:citekey order="55" intorder="1">ronacher1986routes</bcf:citekey>
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<bcf:citekey order="59" intorder="1">windmill2008time</bcf:citekey>
<bcf:citekey order="60" intorder="1">malkin2014energy</bcf:citekey>
<bcf:citekey order="61" intorder="1">machens2001discrimination</bcf:citekey>
<bcf:citekey order="62" intorder="1">machens2001representation</bcf:citekey>
<bcf:citekey order="63" intorder="1">suga1960peripheral</bcf:citekey>
<bcf:citekey order="64" intorder="1">gollisch2002energy</bcf:citekey>
<bcf:citekey order="65" intorder="1">hildebrandt2009origin</bcf:citekey>
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<bcf:citekey order="65" intorder="1">romer1976informationsverarbeitung</bcf:citekey>
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<bcf:citekey order="67" intorder="1">fisch2012channel</bcf:citekey>
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<!-- SORTING TEMPLATES -->
<bcf:sortingtemplate name="nyt">

68
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[0] Config.pm:307> INFO - This is Biber 2.19
[0] Config.pm:310> INFO - Logfile is 'main.blg'
[36] biber:340> INFO - === Do Feb 5, 2026, 16:05:50
[43] Biber.pm:419> INFO - Reading 'main.bcf'
[71] Biber.pm:979> INFO - Found 54 citekeys in bib section 0
[77] Biber.pm:4419> INFO - Processing section 0
[81] Biber.pm:4610> INFO - Looking for bibtex file 'cite.bib' for section 0
[82] bibtex.pm:1713> INFO - LaTeX decoding ...
[111] bibtex.pm:1519> INFO - Found BibTeX data source 'cite.bib'
[296] UCollate.pm:68> INFO - Overriding locale 'en-US' defaults 'normalization = NFD' with 'normalization = prenormalized'
[296] UCollate.pm:68> INFO - Overriding locale 'en-US' defaults 'variable = shifted' with 'variable = non-ignorable'
[296] Biber.pm:4239> INFO - Sorting list 'nyt/global//global/global' of type 'entry' with template 'nyt' and locale 'en-US'
[296] Biber.pm:4245> INFO - No sort tailoring available for locale 'en-US'
[319] bbl.pm:660> INFO - Writing 'main.bbl' with encoding 'UTF-8'
[330] bbl.pm:763> INFO - Output to main.bbl
[330] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 10, warning: 6 characters of junk seen at toplevel
[330] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 21, warning: 6 characters of junk seen at toplevel
[330] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 38, warning: 6 characters of junk seen at toplevel
[330] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 49, warning: 6 characters of junk seen at toplevel
[330] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 58, warning: 6 characters of junk seen at toplevel
[330] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 73, warning: 6 characters of junk seen at toplevel
[330] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 82, warning: 6 characters of junk seen at toplevel
[330] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 91, warning: 6 characters of junk seen at toplevel
[330] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 100, warning: 6 characters of junk seen at toplevel
[330] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 109, warning: 6 characters of junk seen at toplevel
[330] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 118, warning: 6 characters of junk seen at toplevel
[330] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 127, warning: 6 characters of junk seen at toplevel
[330] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 136, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 157, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 178, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 196, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 207, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 218, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 229, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 238, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 247, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 258, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 267, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 278, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 289, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 298, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 317, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 326, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 389, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 416, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 425, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 444, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 471, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 480, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 515, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 524, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 545, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 554, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 565, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 576, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 608, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 637, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 647, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 656, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 677, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 698, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 707, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 716, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 733, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 742, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 767, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:131> WARN - BibTeX subsystem: /tmp/biber_tmp_7COz/347c261ec4135a5723bef5c751f5078f_24469.utf8, line 784, warning: 6 characters of junk seen at toplevel
[331] Biber.pm:133> INFO - WARNINGS: 52

25
main.fdb_latexmk
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@ -1,14 +1,14 @@
# Fdb version 4
["biber main"] 1770303949.74161 "main.bcf" "main.bbl" "main" 1770305979.74481 0
"cite.bib" 1770299611.57339 26414 fcbc2e4bdd871ba0e1d936b82bd77d51 ""
"main.bcf" 1770305979.69979 112481 65739cbbe52243e551f292871d8311ea "pdflatex"
["biber main"] 0 "main.bcf" "main.bbl" "main" 1770736940.85322 -1
"cite.bib" 1770643506.04124 26738 a3ecf998ef3fd04ce34f87829707ecb5 ""
"main.bcf" 1770736940.80657 112636 ed1c2081e91b30dff1dc7040d84b8374 "pdflatex"
(generated)
"main.bbl"
"main.blg"
(rewritten before read)
["pdflatex"] 1770305978.9734 "/home/hartling/phd/paper/paper_2025/main.tex" "main.pdf" "main" 1770305979.74502 0
["pdflatex"] 1770736940.06117 "/home/hartling/phd/paper/paper_2025/main.tex" "main.pdf" "main" 1770736940.85343 0
"/etc/texmf/web2c/texmf.cnf" 1761560044.43676 475 c0e671620eb5563b2130f56340a5fde8 ""
"/home/hartling/phd/paper/paper_2025/main.tex" 1770305978.8808 34498 fbcfce5cf2ee77efb040c307a3788af9 ""
"/home/hartling/phd/paper/paper_2025/main.tex" 1770736939.98858 36498 9491416318b57ca685bfe17df6ddf599 ""
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@ -16,11 +16,13 @@
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@ -10,6 +10,8 @@
\usepackage{parskip}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{subcaption}
\usepackage[labelfont=bf, textfont=small]{caption}
\usepackage[separate-uncertainty=true, locale=DE]{siunitx}
\sisetup{output-exponent-marker=\ensuremath{\mathrm{e}}}
% \usepackage[capitalize]{cleveref}
@ -60,9 +62,16 @@
\newcommand{\adapt}{\raw_{\text{adapt}}} % Adapted signal
% Math shorthands - Kernel parameters:
\newcommand{\ks}{\sigma_i} % Gabor kernel width
\newcommand{\kf}{f_i} % Gabor kernel frequency
\newcommand{\kp}{\phi_i} % Gabor kernel phase
\newcommand{\kw}{\sigma} % Unspecific Gabor kernel width
\newcommand{\kf}{\omega} % Unspecific Gabor kernel frequency
\newcommand{\kp}{\phi} % Unspecific Gabor kernel phase
\newcommand{\kn}{n} % Unspecific Gabor kernel lobe number
\newcommand{\ks}{s} % Unspecific Gabor kernel sign
\newcommand{\kwi}{\kw_i} % Specific Gabor kernel width
\newcommand{\kfi}{\kf_i} % Specific Gabor kernel frequency
\newcommand{\kpi}{\kp_i} % Specific Gabor kernel phase
\newcommand{\kni}{\kn_i} % Specific Gabor kernel lobe number
\newcommand{\ksi}{\ks_i} % Specific Gabor kernel sign
% Math shorthands - Threshold nonlinearity:
\newcommand{\thr}{\Theta_i} % Step function threshold value
@ -142,9 +151,9 @@ parameters of this pattern, such as the duration of syllables and
pauses~(\bcite{helversen1972gesang}), the slope of pulse
onsets~(\bcite{helversen1993absolute}), and the accentuation of syllable onsets
relative to the preceeding pause~(\bcite{balakrishnan2001song};
\bcite{helversen2004acoustic}). The amplitude modulation, or envelope, of the
song is sufficient for recognition~(\bcite{helversen1997recognition}). However,
the essential recognition cues can vary considerably with external physical
\bcite{helversen2004acoustic}). The amplitude modulation of the song is
sufficient for recognition~(\bcite{helversen1997recognition}). However, the
essential recognition cues can vary considerably with external physical
factors, which requires the auditory system to be invariant to such variations
in order to reliably recognize songs under different conditions. For instance,
the temporal structure of grasshopper songs warps with
@ -173,12 +182,12 @@ general:~\bcite{benda2021neural}). In the grasshopper auditory system, a number
of neuron types along the processing chain exhibit spike-frequency adaptation
in response to sustained stimulus
intensities~(\bcite{romer1976informationsverarbeitung};
\bcite{gollisch2002energy}; \bcite{hildebrandt2009origin};
\bcite{clemens2010intensity}) and thus likely contribute to the emergence of
intensity-invariant song representations. This means that intensity invariance
is not the result of a single processing step but rather a gradual process, in
which different neuronal populations contribute to varying
degrees~(\bcite{clemens2010intensity}) and by different
\bcite{gollisch2004input}; \bcite{hildebrandt2009origin};
\bcite{clemens2010intensity}; \bcite{fisch2012channel}) and thus likely
contribute to the emergence of intensity-invariant song representations. This
means that intensity invariance is not the result of a single processing step
but rather a gradual process, in which different neuronal populations
contribute to varying degrees~(\bcite{clemens2010intensity}) and by different
mechanisms~(\bcite{hildebrandt2009origin}). Approximating this process within a
functional model framework thus requires a considerable amount of
simplification. In this work, we demonstrate that even a small number of basic
@ -287,137 +296,168 @@ The essence of constructing a functional model of a given system is to gain a
sufficient understanding of the system's essential structural components and
their presumed functional roles; and to then build a formal framework of
manageable complexity around these two aspects. Anatomically, the organization
of the grasshopper song recognition pathway can be outlined as a hierarchical
feed-forward network of three consecutive neuronal
populations~(Fig.\,\ref{fig:pathway}a-c): Peripheral auditory receptor neurons,
whose axons enter the ventral nerve cord at the level of the metathoracic
ganglion; local interneurons that remain exclusively within the thoracic region
of the ventral nerve cord; and ascending neurons projecting from the thoracic
region towards the supraesophageal ganglion~(\bcite{rehbein1974structure};
\bcite{rehbein1976auditory}; \bcite{eichendorf1980projections}). The input to
the network originates at the membrane of the tympanal organ, which acts as the
primary sound receiver and is coupled to the dendritic endings of the receptor
neurons~(\bcite{gray1960fine}). The outputs from the network converge somewhere
in the supraesophageal ganglion, which is presumed to harbor the neuronal
substrate for conspecific song recognition and response
of the grasshopper song recognition pathway can be outlined as a feed-forward
network of three consecutive neuronal
populations~(Fig.\,\mbox{\ref{fig:pathway}a-c}): Peripheral auditory receptor
neurons, whose axons enter the ventral nerve cord at the level of the
metathoracic ganglion; local interneurons that remain exclusively within the
thoracic region of the ventral nerve cord; and ascending neurons projecting
from the thoracic region towards the supraesophageal
ganglion~(\bcite{rehbein1974structure}; \bcite{rehbein1976auditory};
\bcite{eichendorf1980projections}). The input to the network originates at the
tympanal membrane, which acts as acoustic receiver and is coupled to the
dendritic endings of the receptor neurons~(\bcite{gray1960fine}). The outputs
from the network converge in the supraesophageal ganglion, which is presumed to
harbor the neuronal substrate for conspecific song recognition and response
initiation~(\bcite{ronacher1986routes}; \bcite{bauer1987separate};
\bcite{bhavsar2017brain}). Functionally, the ascending neurons are the most
diverse of the three populations along the pathway. Individual ascending
neurons possess highly specific response properties that contrast with the
homogeneous responses of the preceding receptor neurons and local
interneurons~(\bcite{clemens2011efficient}), indicating a transition from a
uniform population-wide processing stream into several parallel branches. Based
on these anatomical and physiological considerations, the overall structure of
the model pathway is divided into two distinct
rather homogeneous response properties of the preceding receptor neurons and
local interneurons~(\bcite{clemens2011efficient}), indicating a transition from
a uniform population-wide processing stream into several parallel branches.
Based on these anatomical and physiological considerations, the overall
structure of the model pathway is divided into two distinct
stages~(Fig.\,\ref{fig:pathway}d). The preprocessing stage incorporates the
known physiological processing steps at the levels of the tympanal membrane,
the receptor neurons, and the local interneurons; and operates on
one-dimensional signal representations. The feature extraction stage
corresponds to the processing within the ascending neurons and further
downstream towards the supraesophageal ganglion; and operates on
higher-dimensional signal representations. The details of each processing step
within the two stages are outlined in the following sections.
high-dimensional signal representations. The details of each physiological
processing step and its functional approximation within the two stages are
outlined in the following sections.
\begin{figure}[!ht]
\centering
\def\svgwidth{\textwidth}
\import{figures/}{fig_auditory_pathway.pdf_tex}
\caption{\textbf{Schematic organisation of the song recognition pathway in
grasshoppers compared to the structure of the model pathway.}
\textbf{a}:~Course of the pathway in the grasshopper, from
the tympanal membrane over receptor neurons (1st order),
local interneurons (2nd order) of the metathoracic
ganglion, and ascending neurons (3rd order) further
towards the central brain.
\textbf{b}:~Connections between the three neuronal
populations within the metathoracic ganglion.
grasshoppers compared to the structure of the functional
model pathway.}
\textbf{a}:~Simplified course of the pathway in the
grasshopper, from the tympanal membrane over receptor
neurons, local interneurons, and ascending neurons further
towards the supraesophageal ganglion.
\textbf{b}:~Schematic of synaptic connections between
the three neuronal populations within the metathoracic
ganglion.
\textbf{c}:~Network representation of neuronal connectivity.
\textbf{d}:~Flow diagram of the different signal
representations (boxes) and transformations (arrows) along
the model pathway. The pathway consists of a
population-wide preprocessing stream followed by several
parallel feature extraction streams.
representations and transformations along the model
pathway. All representations are time-varying. 1st half:
Preprocessing stage (one-dimensional). 2nd half: Feature
extraction stage (high-dimensional).
}
\label{fig:pathway}
\end{figure}
\subsection{Population-driven signal preprocessing}
Grasshoppers receive airborne sound waves by a tympanal organ at each side of
the thorax~(Fig.\,\ref{fig:pathway}a). The tympanal membrane acts as a
mechanical resonance filter: Vibrations that fall within specific frequency
bands are focused on different membrane areas, while others are
attenuated~(\bcite{michelsen1971frequency}; \bcite{windmill2008time};
\bcite{malkin2014energy}). This processing step can be approximated by an
initial bandpass filter
Grasshoppers receive airborne sound waves by a tympanal organ at either side of
the body. The tympanal membrane acts as a mechanical resonance filter for
sound-induced vibrations~(\bcite{windmill2008time}; \bcite{malkin2014energy}).
Vibrations that fall within specific frequency bands are focused on different
membrane areas, while others are attenuated. This processing step can be
approximated by an initial bandpass filter
\begin{equation}
\filt(t)\,=\,\raw(t)\,*\,\bp, \qquad \fc\,=\,5\,\text{kHz},\,30\,\text{kHz}
\label{eq:bandpass}
\end{equation}
applied to the acoustic input signal $\raw(t)$. The auditory receptor neurons
connect directly to the tympanal membrane~(Fig.\,\ref{fig:pathway}a). Besides
performing the mechano-electrical transduction, the receptor population is
substrate to several known processing steps. First, the receptors extract the
signal envelope~(\bcite{machens2001discrimination}), which likely involves a
rectifying nonlinearity~(\bcite{machens2001representation}). This can be
modelled as full-wave rectification followed by lowpass filtering
transduce the vibrations of the tympanal membrane into sequences of action
potentials. Thereby, they encode the amplitude modulation, or envelope, of the
signal~(\bcite{machens2001discrimination}), which likely involves a rectifying
nonlinearity~(\bcite{machens2001representation}). This can be modelled as
full-wave rectification followed by lowpass filtering
\begin{equation}
\env(t)\,=\,|\filt(t)|\,*\,\lp, \qquad \fc\,=\,500\,\text{Hz}
\label{eq:env}
\end{equation}
of the tympanal signal $\filt(t)$. Furthermore, the receptors exhibit a
sigmoidal response curve over logarithmically compressed intensity
levels~(\bcite{suga1960peripheral}; \bcite{gollisch2002energy}). In the model,
logarithmic compression is achieved by conversion to decibel scale
levels~(\bcite{suga1960peripheral}; \bcite{gollisch2002energy}). In the model
pathway, logarithmic compression is achieved by conversion to decibel scale
\begin{equation}
\db(t)\,=\,10\,\cdot\,\dec \frac{\env(t)}{\dbref}, \qquad \dbref\,=\,\max[\env(t)]
\label{eq:log}
\end{equation}
relative to the maximum intensity $\dbref$ of the signal envelope $\env(t)$.
Next, the axons of the receptor neurons project into the metathoracic ganglion,
where they synapse onto local interneurons~(Fig.\,\ref{fig:pathway}b). Both the
local interneurons~(\bcite{hildebrandt2009origin};
\bcite{clemens2010intensity}) and, to a lesser extent, the receptors
themselves~(\bcite{fisch2012channel}) display spike-frequency adaptation in
response to sustained stimulus intensity levels. This mechanism allows for the
robust encoding of faster amplitude modulations against a slowly changing
overall baseline intensity. Functionally, this processing step resembles a
highpass filter
Both the receptor neurons~(\bcite{romer1976informationsverarbeitung};
\bcite{gollisch2004input}; \bcite{fisch2012channel}) and, on a larger scale,
the subsequent local interneurons~(\bcite{hildebrandt2009origin};
\bcite{clemens2010intensity}) adapt their firing rates in response to sustained
stimulus intensity levels, which allows for the robust encoding of faster
amplitude modulations against a slowly changing overall baseline intensity.
Functionally, the adaptation mechanism resembles a highpass filter
\begin{equation}
\adapt(t)\,=\,\db(t)\,*\,\hp, \qquad \fc\,=\,10\,\text{Hz}
\label{eq:highpass}
\end{equation}
over the logarithmically scaled envelope $\db(t)$. The projections of the local
interneurons remain within the metathoracic ganglion and synapse onto a small
number of ascending neurons~(Fig.\,\ref{fig:pathway}b), which marks the
transition between the preprocessing stream and the parallel processing stream
of the model pathway.
over the logarithmically scaled envelope $\db(t)$. This processing step
concludes the preprocessing stage of the model pathway. The resulting
intensity-adapted envelope $\adapt(t)$ is then passed on from the local
interneurons to the ascending neurons, where it serves as the basis for the
following feature extraction stage.
\subsection{Feature extraction by individual neurons}
The small population of ascending neurons
\textbf{Stage-specific processing steps and functional approximations:}
Template matching by individual ANs\\
- Filter base (STA approximations): Set of Gabor kernels\\
- Gabor parameters: $\ks, \kp, \kf$ $\rightarrow$ Determines kernel sign and lobe number
%
\begin{equation}
k_i(t,\,\ks,\,\kf,\,\kp)\,=\,e^{-\frac{t^{2}}{2{\ks}^{2}}}\,\cdot\,\sin(2\pi\kf\,\cdot\,t\,+\,\phi_i)
\label{eq:gabor}
\end{equation}
%
$\rightarrow$ Separate convolution with each member of the kernel set
%
The ascending neurons extract and encode a number of different features of the
preprocessed signal. As a population, they hence represent the signal in a
higher-dimensional space than the preceding receptor neurons and local
interneurons. Each ascending neuron is assumed to scan the signal for a
specific template pattern, which can be thought of as a kernel of a particular
structure and on a particular time scale. This process, known as template
matching, can be modelled as a convolution
\begin{equation}
c_i(t)\,=\,\adapt(t)\,*\,k_i(t)
= \infint \adapt(\tau)\,\cdot\,k_i(t\,-\,\tau)\,d\tau
\label{eq:conv}
\end{equation}
%
of the intensity-adapted envelope $\adapt(t)$ with a kernel $k_i(t)$ per
ascending neuron. We used Gabor kernels as basis functions for creating
different preferred patterns. An arbitrary one-dimensional, real Gabor kernel
is generated by multiplication of a Gaussian envelope and a sinusoidal carrier
\begin{equation}
k_i(t,\,\kwi,\,\kfi,\,\kpi)\,=\,e^{-\frac{t^{2}}{2{\kwi}^{2}}}\,\cdot\,\sin(\kfi\,t\,+\,\kpi), \qquad \kfi\,=\,2\pi f_{sin}
\label{eq:gabor}
\end{equation}
with Gaussian standard deviation or kernel width $\kwi$, carrier frequency
$\kfi$, and carrier phase $\kpi$. Different combinations of $\kwi$, $\kfi$, and
$\kpi$ result in Gabor kernels with different lobe number $\kni$ and sign
$\ksi$. If the function space is constrained to only include mirror- or
point-symmetric Gabor kernels, frequency $\kf$ is related to lobe number $\kn$
by
\begin{equation}
\kp(\kn,\,\ks)\,=\,0.5\,\cdot\,(1\,-\,\text{mod}[\kn,\,2]\,+\,\ks)
\end{equation}
which results in the specific phase values shown in
Table\,\mbox{\ref{tab:gabor_phases}}.
\FloatBarrier
\begin{table}[!ht]
\centering
\captionsetup{width=.55\textwidth}
\caption{}
\begin{tabular}{|ccc|}
\hline
sign $\ks$ & even $\kn$ & odd $\kn$\\
\hline
+1 & $+\pi\,/\,2$ & $\pi$\\
-1 & $-\pi\,/\,2$ & $0$\\
\hline
\end{tabular}
\label{tab:gabor_phases}
\end{table}
\FloatBarrier
In order to create a Gabor kernel with a specific lobe number $\kn$ and kernel
width $\kw$, frequency $\kf$ has to be set to
\begin{equation}
\kf(\kn,\,\kw)\,=\,\frac{\kn}{2\pi\,\kw}
\end{equation}
\textbf{Stage-specific processing steps and functional approximations:}
Thresholding nonlinearity in ascending neurons (or further downstream)\\
- Binarization of AN response traces into "relevant" vs. "irrelevant"\\
$\rightarrow$ Shifted Heaviside step-function $\nl$ (or steep sigmoid threshold?)