More papers, little bit of text.

main.tex

@@ -134,10 +134,25 @@ $\rightarrow$ More general, simpler, unfitted formalized Gabor filter bank
 
 \section{Developing a functional model of\\the grasshopper auditory pathway}
 
-The auditory pathway of grasshoppers comprises a number of neuronal stages and
-identified cell types~(\bcite{rehbein1974structure}; \bcite{rehbein1976auditory}).
+% Either pick up in intro and/or discussion, or move entirely:
+The grasshopper auditory system has been studied extensively over the past
+decades; and a corresponding number of involved neuron types has been
+described~(\bcite{rehbein1974structure}; \bcite{kalmring1975afferent};
+\bcite{rehbein1976auditory}; \bcite{eichendorf1980projections}). The model we
+propose here focuses on the pathway responsible for song recognition and
+assumes a strict feed-forward organization of three consecutive neuronal
+populations: Peripheral auditory receptor neurons~\mbox{(1st order)}, local
+interneurons of the metathoracic ganglion~\mbox{(2nd order)}, and ascending
+neurons~\mbox{(3rd order)} projecting towards the supraesophageal ganglion.
+
+Previous authors have reported a marked increase in response heterogenity
+within the population of ascending neurons compared to receptors and local
+interneurons, which exhibit almost identical filter characteristics,
+respectively~(\bcite{clemens2011efficient}). Based on these findings, the model
+pathway can be divided into two distinct portions~(Fig.\,\ref{fig:pathway}c+d).
+The pre-processing portion comprises the tympanal membrane, receptors, and
+local interneurons. Due to the similar response properties within the 
 
-Along the auditory pathway of grasshoppers (Fig.\,\ref{fig:pathway}a+b), 
 
 1) "Pre-split portion" of the auditory pathway:\\
 Tympanal membrane $\rightarrow$ Receptor neurons $\rightarrow$ Local interneurons