Implementation of activation function?

[Lucas Meijer <mach82@mach8.nl>]

Hi,

  Does anyone know how I can find out what PDP++ uses to determine
wether or not a certain unit 'fires' given a certain activation?

I've dug trough all the documentation, and what I could find was that the
'default' was a sigmoidian activation function, with its parameters read
from BpUnitSpec:

act range, min : 0, max : 1
sig, off: 0, gain: 1

I cannot find any info on how to use these parameters to determine wether
or not a unit fires (and if so, how strong its fire is)

PS Excuse me for my surely improper names. I'm new to this field, and have
little context. I hope I'm able to formulate my question clearly enough
that you can understand what I'm asking.

Thanks, Lucas