the half wave rectifying function

[windform2015]

Dear Bednar,

I would like to ask, for the function of responses of LGN units defined in J.Neuroscience paper(2013), you use a half wave rectifying function which ensures the responses are positive, is this function to let negative values become zeros or the absolute values ?

[windform2015]

Since I found some different definitions about the half wave rectifier function.

[jbednar]

Zeros.