Biomedical Engineering Reference
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Figure 14.13
Simulation of the network of tangential cells with each neuron modeled as a single
compartment. The circuit, without the input from local motion detectors, is shown in
the center. To the left and to the right, the signals of 5 different tangential cells sen-
sitive to horizontal image motion are displayed as a function of time. The stimulus
consists of a binocular image rotation, first clockwise (CW) for 1 sec, then counter-
clockwise (CCW) for 1 sec.
of figure-ground discrimination [76, 77], is not clear at the moment.
However, the following facts lead to some interesting speculations of how the CH-
cell might be responsible for the small-field tuning in FD- and CI-neurons. First of
all, the CH-cell is known to be GABAergic with chemical output synapses within its
dendrite in the lobula plate [68, 37]. Since there are no chemical output synapses
found within the protocerebral ramifications of CH-cells [37], it seems reasonably
justified to assume that the CH-cell inhibits other lobula plate tangential cells within
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