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Experimental Setup

For each sub-band, we create a confusion matrix (CM), which is simply an extended matrix of hits and misses for all classes. To summarize the confusion matrix, we calculate mutual information (MI) for each CM [8] as $\sum_{i,j} p_{ij} log
\frac{p_{ij}}{p_i p_j}$, where i is the feature we would like to transmit, and j is the feature that is perceived. We estimate the probabilities pij, pi, and pj from nij/n, ni/n, and nj/n, respectively, where ni is the frequency of stimulus i, nj is the frequency of response j, and nij is the frequency of the joint occurrence of stimulus i and response j in a sample of n observations.

Christophe Ris