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Performance Limitations of Relay Neurons
Figure 2
Properties properties of 
.
(A) Illustrates the equilibrium point 
, the steady state orbit 
and the orbit tube, 
, for 
given by (3) and 
. The orbit tube is shown for 
. (B) Illustrates 
, the threshold voltage 
and threshold current 
. Note that these parameters are defined by the undriven system (9). (C) Illustrates the critical hypersurface 
, a successful response trajectory, an unsuccessful response trajectory, and the refractory zone, 
for the undriven system (9). The time it takes for the solution to leave 
after generating a successful response is called the refractory period, 
. Note that refractory zone depends on 
and therefore 
also depends on 
. Additionally, note that the region shaded in the darker grey is also in the refractory zone, because if 
is in this region then 
such that 
Therefore, a successful response cannot be generated if 
is in this region by definition. (D) Dependence of 
on 
. Note that 
is approximately a straight line with slope 
, i.e 
. (E) Illustrates 
vs 
and 
.
doi: https://doi.org/10.1371/journal.pcbi.1002626.g002