Bullet-pointing a first draft (WIP).
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\documentclass[a4paper, 12pt]{article}
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\begin{document}
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\usepackage{parskip}
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\title{Physiologically inspired model of the grasshopper auditory system}
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\author{Jona Hartling, Jan Benda}
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\date{}
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\begin{document}
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\maketitle{}
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\section{The sensory world of a grasshopper}
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Strong dependence on acoustic signals for ranged communication\\
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- Diverse species-specific sound repertoires and production mechanisms\\
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- Different contexts/ranges: Stridulatory, mandibular, wings, walking sounds\\
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- Mate attraction/evaluation, rival deterrence, loss-of-signal predator alarm\\
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$\rightarrow$ Elaborate acoustic behaviors co-depend on reliable auditory perception
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Songs = Amplitude-modulated (AM) broad-band acoustic signals\\
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- Generated by stridulatory movement of hindlegs against forewings\\
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- Shorter time scales: Characteristic temporal waveform pattern\\
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- Longer time scales: High degree of periodicity (pattern repetition)\\
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- Sound propagation: Signal intensity varies strongly with distance to sender\\
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- Ectothermy: Temporal structure warps with temperature\\
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$\rightarrow$ Sensory constraints imposed by properties of the acoustic signal itself
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Multi-species, multi-individual communally inhabited environments\\
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- Temporal overlap: Simultaneous singing across individuals/species common\\
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- Frequency overlap: No/hardly any niche speciation into frequency bands\\
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- "Biotic noise": Hetero-/conspecifics ("Another one's songs are my noise")\\
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- "Abiotic noise": Wind, water, vegetation, anthropogenic\\
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- Effects of habitat structure on sound propagation (landscape - soundscape)\\
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$\rightarrow$ Sensory constraints imposed by the (acoustic) environment
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Cluster of auditory challenges (interlocking constraints $\rightarrow$ tight coupling):\\
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From continuous acoustic input, generate neuronal representations that...\\
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1)...allow for the separation of relevant (song) events from ambient noise floor\\
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2)...compensate for behaviorally non-informative song variability (invariances)\\
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3)...carry sufficient information to characterize different song patterns,
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recognize the ones produced by conspecifics, and make appropriate behavioral
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decisions based on context (sender identity, song type, mate/rival quality)
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How can the auditory system of grasshoppers meet these challenges?\\
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- What are the minimum functional processing steps required?\\
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- Which known neuronal mechanisms can implement these steps?\\
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- Which and how many stages along the auditory pathway contribute?\\
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$\rightarrow$ What are the limitations of the system as a whole?
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How can a human observer conceive a grasshopper's auditory percepts?\\
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- How to investigate the workings of the auditory pathway as a whole?\\
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- How to systematically test effects and interactions of processing parameters?\\
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||||
- How to integrate the available knowledge on anatomy, physiology, ethology?\\
|
||||
$\rightarrow$ Abstract, simplify, formalize $\rightarrow$ Functional model framework
|
||||
|
||||
\section{Pre-split pathway: Population pre-processing}
|
||||
Filtering of behaviorally relevant frequencies by tympanal membrane\\
|
||||
- Bandpass 5-30 kHz
|
||||
|
||||
Extraction of signal envelope (AM encoding) by receptor population\\
|
||||
- Full-wave rectification + lowpass 500 Hz
|
||||
|
||||
Logarithmically compressed intensity tuning curve of receptors\\
|
||||
- Decibel transformation
|
||||
|
||||
Spike-frequency adaptation in receptor and interneuron populations\\
|
||||
- Highpass 10 Hz
|
||||
|
||||
\section{Post-split pathway: Feature extraction}
|
||||
|
||||
Template matching by individual ascending neurons\\
|
||||
- Separate convolution with each of a set of Gabor kernels\\
|
||||
- Pathway splitting: Single population response into several separate branches
|
||||
- Expansion into a higher-dimensional sound representation
|
||||
|
||||
Thresholding nonlinearity in ascending neurons (or further downstream)\\
|
||||
- Step-function (or sigmoid) threshold\\
|
||||
- Binarization of response values into "relevant" vs. "irrelevant"
|
||||
|
||||
Temporal averaging by neurons of the central brain\\
|
||||
- Lowpass 1 Hz\\
|
||||
- Finalized set of slowly changing kernel-specific features\\
|
||||
- Different (species-specific) songs are characterized by a distinct combination of feature values
|
||||
|
||||
\section{Pre-split intensity invariance:\\Logarithm-highpass mechanism}
|
||||
|
||||
\section{Post-split intensity invariance:\\Threshold-lowpass mechanism}
|
||||
|
||||
\section{Conclusion and outlook}
|
||||
|
||||
\end{document}
|
||||
Loading…
Reference in New Issue
Block a user