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87

Figure 3.6: Rendering of a binary branching cell of depth 3 obeying Rall’s 3/2 power
law. The root branch has length 200
μm and radius 8 μm, agreeing with the morphological
parameters as given in Rallpack 2 of (Bhalla et al., 1992).

Table 3.5: Performance of reduced model (here kυ = kj') of HH Rail cells of depth 3 for
tapered and non-tapered branches as compared with the full model (A = 1823).

Speed-up

% Matched

% Mismatched

Γ

30, tapered

19.0×

95.9

1.1

0.974

30, non-tapered

18.9×

79.2

8.9

0.836

40, non-tapered

14.8×

91.5

5.6

0.847

50, non-tapered

12.0×

93.9

5.4

0.874

dynamics to high accuracy. The tapered cell is less excitable than the non-tapered
cell (which may be expected since there are more compartments with greater surface
areas in the tapered cell). Also, the non-tapered cell requires a larger reduced system
to capture the dynamics, which suggests that cells with smoothly varying dendritic
radii may yield better results than cells whose radii change abruptly.

3.4 Results on Realistic Morphologies

3.4.1 Results on Neuron AR-l-20-04-A

Consider the projection interneuron AR-l-20-04-A (Martinez), which has 35 bran-
ches and 20 leaves. At 1
μm resolution, the full system has N = 2233 compartments.



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