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@@ -282,34 +282,32 @@ within the auditory pathway.
\section{Developing a functional model of the\\grasshopper song recognition pathway}
The essence of constructing a functional model of a sensory processing system
is to gain a sufficient understanding of the system's essential structural
components and the functional roles they might fulfill; 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 from
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 of the network converge somewhere
in the supraesophageal ganglion, which is presumed to harbor the neuronal
substrate of song recognition~(\bcite{romer1985responses};
\bcite{ronacher1986routes}; \bcite{bauer1987separate};
\bcite{bhavsar2017brain}).
The input to the network originates from
sound-induced vibrations of the tympanal membrane on each side of the thorax,
which are transduced into electro-chemical signals by the receptor neurons. The
output from the network converges somewhere in the supraesophageal ganglion,
where the recognition of conspecific songs is presumed to take
place~(\bcite{romer1985responses}; \bcite{ronacher1986routes};
\bcite{bauer1987separate}; \bcite{bhavsar2017brain}). Functionally, the
ascending neuron population is characterized by a marked increase in response
heterogenity compared to the preceding receptor neurons and local interneurons,
which exhibit relatively homogeneous response properties across their
respective populations~(\bcite{clemens2011efficient}). Based on these
considerations, the organisation of the model
Functionally, the ascending neuron population is characterized by a marked
increase in response heterogenity compared to the preceding receptor neurons
and local interneurons, which exhibit relatively homogeneous response
properties across their respective populations~(\bcite{clemens2011efficient}).
Based on these considerations, the organisation of the model
pathway~(Fig.\,\ref{fig:pathway}d) comprises two distinct overall stages: