Hi,
I want to run a contrast sensitivity test for different spatial freqwuency
and I was told that the contrast threshold demo of psychtoll is good
enough for this. I have several question regarding to this:
1- does one needs to calibrate the values for contrast by measuring the
actual intensities of the screen before running the test? (or maybe the
program can adjust to this autimatically ??)
2- Can one run the test on laptop ((using lcd screen)? is it reliable?
3- What is the recomended resolution for being able to have good stimuli
for high SF (such as 30 c/d)
4- in the demo the program run for 20 trials only - is it reasonable to
assum convergence of the algorithm so early? or it inly for demo purposes?
5- when is running without noise and withou gaussian envelope - the signal
is always detectable. Is there a way to control this?
Thank you
Orna Rosenthal
I want to run a contrast sensitivity test for different spatial freqwuency
and I was told that the contrast threshold demo of psychtoll is good
enough for this. I have several question regarding to this:
1- does one needs to calibrate the values for contrast by measuring the
actual intensities of the screen before running the test? (or maybe the
program can adjust to this autimatically ??)
2- Can one run the test on laptop ((using lcd screen)? is it reliable?
3- What is the recomended resolution for being able to have good stimuli
for high SF (such as 30 c/d)
4- in the demo the program run for 20 trials only - is it reasonable to
assum convergence of the algorithm so early? or it inly for demo purposes?
5- when is running without noise and withou gaussian envelope - the signal
is always detectable. Is there a way to control this?
Thank you
Orna Rosenthal