Measurement of electronic distances.

[gary]

Apologies in advance for another obtuse question.

I enjoyed working through the electronic analysis tutorial at http://www.neuron.yale.edu/neuron/stati ... zclass.htm using the NEURON GUI. Returning to my Python code, I am attempting to perform a similar analysis however I cannot see an obvious way to return the value of `attenuation' or `log(attenuation)'. Looking at http://www.neuron.yale.edu/neuron/stati ... html#ratio , the impedance class' function `ratio' is the closest thing I can find. Or is the attenuation measurement not available for the programmer?

[ted]

The voltage transfer ratio is
voltage downstream / voltage upstream
and is always <= 1.

Voltage attenuation is simply 1 / voltage transfer ratio, so that a bigger number means more attenuation (makes sense, right?).

[gary]

Thanks for an incredibly swift answer!

(makes sense, right?)

I *think* so. You can score my responses to your reply as to whether or not I really do understand!

The voltage transfer ratio is voltage downstream / voltage upstream and is always <= 1.

If this refers to Impedance.ratio(x) - I interpret this as downstream voltage recorded at the CAS at location x divided by the size of the upstream voltage source located according to Impedance.loc() after calculation with Impedance.compute(freq, flag). Since voltages can't `grow', this means its value must be <=1.

Voltage attenuation is simply 1 / voltage transfer ratio, so that a bigger number means more attenuation (makes sense, right?).

Or: log_e(Attenuation) = -log_e(Ratio) = my measurement of electronic distance in units of nepers?

[ted]

In discussing the potential at two points, it is convenient to use "upstream" to refer to the point that is closer to the signal source, and "downstream" for the point that is farther away.

log_e(Attenuation) = -log_e(Ratio) = my measurement of electronic distance in units of nepers?

A native of the realm of neuroscience would not even know such a term existed. You betray your infiltration from some other province of geekdom.