Linear separation of odors in the space of KC activities.

Left: Illustration of the hyperplane (dashed teal line) in the space of KC activities that separates conditioned odor responses from neutral odor responses. Each light red (resp. blue) dot denotes the KC response to a conditioned (resp. neutral) odor. The teal arrow denotes the vector of KC-MBON synaptic weights w, which is translated to show that it is orthogonal to the hyperplane . Right: Co-activation of the KCs and the DAN weakens the synaptic weights w. The KC activities x_t are denoted by the dark red dot with black border. The change of the synaptic weights Δw is in the direction −x_t. The hyperplane rotates to remain orthogonal to w. The change in bias Δb, which translates the hyperplane, is not depicted.