Figure 2.

Summary of responses of a single γ-cell to 10 spoken digits, “zero” through “nine” (speech data taken from the TI46 database, available from the National Institute of Standards and Technology). Each digit was spoken 10 times by eight different female speakers while the responses of the γ-cell were recorded. For the purpose of evaluating the cell's selectivity, each trial was classified as “responding” if the γ-cell fired four or more spikes and as “not responding” otherwise. Triangles indicate averages over different utterances by individual speakers, whereas the gray bars indicate data averaged over all utterances of all speakers. For five of the eight speakers, the cell's response is highly selective for the word “one.” The filled symbol indicates the speaker from which the single training utterance was taken.