Figure 5.

Difference between I (solid line) and I _sh (dashed line). Spike data and length of stimuli are the same as in Figure 9, A1 and A2. I is the value of the mutual information that is directly computed from Equation 2. I _sh is computed using Equation 21. I provides the upper bound of the real value of the mutual information I _real, and I _sh provides the lower bound of I _real. In other words, I _sh < I _real < I. The difference between I and I _sh is markedly small even when all recorded cells (N = 7 in spike data 1; N = 6 in spike data 2) are analyzed. A, Spike data 1. B, Spike data 2.