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. 2017 Apr 10;11:26. doi: 10.3389/fninf.2017.00026

Figure 5.

Figure 5

The unique impact of the atypical neurons EIP8 and EIP17 on the central complex network. (A) The EIP8 neuron type in the observed network innervates the medial PB subunits. (B) In contrast, the predicted EIP8 in the model network innervates the lateral PB subunits. The EIP17 neuron is a mirroring of EIP8 in both networks. (C) Removing EIP8 and EIP17 from the observed network completely abolishes the information hotspots at the propagation level 3. (D) Interestingly, the hotspots can be partially “rescued” at the level 3 in the model network by adding the atypical neurons EIP8 and EIP17 back. In order to visualize the detailed changes, here we only show a small portion (corresponds to the red rectangle in Figures 3C,D) of the connection matrix. (E) The distribution of path numbers at the propagation level 3 between every pair of neurons for observed, model, lesioned, and rescued networks. The distributions for the observed and rescued networks both exhibit a long tail, characterizing the existence of neuron pairs with high path numbers. (F) The effects of different neuron types on the maximum path number at the propagation level 3. By removing a single neuron type (blue) or a neuron type together with its contralateral counterpart (red) one at a time from the observed network, we discovered that only EIP8 and EIP17 cause the most significant reduction in the maximum path number, more than any other neuron types. (G) The locations of the axonal terminals are crucial for the effect of EIP8 and EIP17 on the path number. By randomly allocating the two axonal terminals of EIP8 in PB and keeping the EIP17 neuron symmetric to EIP8, we observed that only in their native terminal locations, EIP8 and EIP17 neurons lead to the highest maximum path numbers. The vertical and the horizontal axes indicate the positions of the axonal terminals in PB (index of PB subunit). The number in each small square labels the maximum path number of the network at the level 3 with the indicated terminal positions. The diagonal represents the condition in which the EIP8 and EIP17 neurons only innervate one single PB subunit.