Drosophila Mushroom Body Learning Circuit (2D)

This is the 2D top-down sibling of the mushroom-body learning circuit: the same ~1,500 Kenyon cells, the same five pre-defined sparse odor ensembles, and the same dopamine-gated synaptic depression rule, rendered as a pannable, zoomable flat map instead of a 3D point cloud. Pairing an odor with a simulated dopamine reward or punishment pulse depresses that odor's active Kenyon cells' synapses onto one of two mushroom-body output neurons — approach or avoidance — exactly as reward- and punishment-signalling dopaminergic neurons do in the living fly. Live readouts track the resulting behavioural valence, the size of the active Kenyon-cell ensemble, and the remaining synaptic weight on each pathway, while a moving marker shows the circuit's approach/avoid decision shift in real time as learning accumulates.