Talk:Quadratic integrate and fire

TODO:
BBAmp (talk) 07:07, 11 December 2014 (UTC)
 * Add examples and figures of QIF
 * Show nondimensionalization of QIF with units
 * Include various properties of QIF
 * Include more context/sources
 * Make article more accessible — Preceding unsigned comment added by BBAmp (talk • contribs) 12:57, 11 December 2014 (UTC)
 * Include numerical scheme — Preceding unsigned comment added by BBAmp (talk • contribs) 13:03, 11 December 2014 (UTC)

What are the variables??
We see this:
 * $$ \frac{dx}{dt} = x^2+I $$

I'm guessing t is time. But what is x? And what units is it measure in? Voltage? Charge (in coulombs)? Something else? Michael Hardy (talk) 20:09, 12 December 2014 (UTC)


 * The variable $$x$$ is meant to represent the membrane voltage of a neuron and $$I$$ is meant to represent some input current to the membrane. Units for $$x$$ can be taken to be Voltage (mV) and $$I$$ can be taken to be Amps (nA), but they are often dimensionless because the units don't quite work out in the above form. AppliedMathematician (talk) 14:20, 28 September 2023 (UTC)

It this supposed to be a linear integrate and fire?
The actual formula for QIF neuron is $$\frac{dv}{dt} = -\frac{v(1-v)}{\tau_m} + I $$ With $$\tau_m$$ being the membrane time constant. The point of using a QIF neuron as opposed to LIF is that the sub-threshold voltage should have an inflection point, before a spike. This would closely mimic HH equation with low computational cost

Hi, "Actual" is relative. The above form is a perfectly valid version of the QIF neuron AppliedMathematician (talk) 14:21, 28 September 2023 (UTC)