[timlarshanson]

I was aware of Neftci's work, but not your result -- I stand corrected! Given the perspective, given LIF networks are causal systems, of course you can reverse it with sufficient memory. I understand the memory in this case are input synaptic currents at the time of every spike (e.g. what synapses contributed to the spike). This is suspiciously similar to spine and dendritic calcium concentrations. Those variables are usually only stored for a short time - but that said the hippocampus (at least) is adept at reverse replay so there is no reason calcium could not be a proxy for 'adjoint'. hum.

Interesting Maass references too. Cheers

[orbifold]

I agree that calcium seems like a natural candidate and I suggest as much in my thesis. Coming from physics, I didn't know about reverse replay in the hippocampus for a long time, but I also have this association now. I would be glad to talk more, is there a way to reach you?