ComputeNakaRushton

Psychtoolbox › Psychometric

[response] = ComputeNakaRushton(params,contrast)

Compute the Naka-Rushton function on passed vector of contrasts.
Several different forms may be computed depending on length of
passed params vector.

length(params) == 2
sigma = params(1)
n = params(2)
response = contrast^n/[contrast^n + sigma^n]

length(params) == 3
Rmax = params(1)
sigma = params(2)
n = params(3)
response = Rmax*[contrast^n]/[contrast^n + sigma^n]

length(params) == 4
Rmax = params(1)
sigma = params(2)
n = params(3)
m = params(4)
response = Rmax*[contrast^n]/[contrast^m + sigma^m]

8/1/05 dhb, pr Wrote from FitLightnessOrient version
8/2/07 dhb Rewrote to allow several different forms depending
12/5/10 dhb Expanded comment. Error check on input length