Summary
2011 International Symposium on Nonlinear Theory and Its Applications
2011
Session Number:B2L-D
Session:
Number:B2L-D3
Wasteful Inhibitions for Paradoxical Spike Propagation in a Recurrent Network
Toshikazu Samura, Hatsuo Hayashi,
pp.431-434
Publication Date:2011/9/4
Online ISSN:2188-5079
Summary:
We have demonstrated that spikes propagate in a paradoxical direction in a recurrent network where the distance of inhibitory recurrent connections was anisotropic. In this study, we demonstrate that the paradoxical spike propagation also emerges in a recurrent network where the distance of excitatory recurrent connections is anisotropic. Spikes propagate in the direction where the density of excitatory connections is low and recurrent excitation to be weak. The common feature to the above two cases of directional spike propagation is that spikes propagate in a direction where inhibitory interneurons extend their axons to slightly more distant neurons than excitatory neurons regardless of the density of recurrent excitatory connections. In our network, the inhibitory spikes that arrive at excitatory neurons are too early to prevent the excitatory neurons from firing in the direction of extended inhibitory connections. This suggests that the network causes paradoxical spike propagation due to wasteful inhibitions rather than the anisotropic difference of the density of excitatory connections.