Brain Dynamics:
Spike Challenge 2
Opposite inputs can make the same spikes
Whatever this spiking mechanism is, it has some strange properties!
Let’s take a neuron and try to make it spike. The usual way to do this is give it positive current
inputs:
But now let’s give it the opposite, negative input -- pushing the
neuron's voltage down and away from the spike.
Incredibly, we still get a spike!
The third mathematical challenge, then, is that the spiking mechanism
must be highly nonlinear – what comes out of the neuron is most
certainly NOT predictable by just summing what goes in!
