Figure 4.

Spatial distribution of olfactory bulb neural responses during learning. (A) In order to establish the spatial distribution of olfactory bulb mitral cell responses and learning-related changes, the microelectrode array was partitioned mediolaterally and anteroposteriorly (photograph and schematic illustrate the localization of the 24-electrode arrays). There was no significant variation in multiunit responses, or in learning-related changes, across the mediolateral dimension of the array. Histograms in (B) show that the increase (mean ± sem) in the size of the multiunit responses to the combined presentation of ginger and CS₂, and the learning-related increase in the size of the multineuron response to ginger was restricted to the posterior half of the array.