Response times in Psycho backend

gerhono

Hi everybody,

I have a problem of response time with the 'Psycho' backend and I notice that many users have the same problem. It can be solved using the 'Legacy' backend.

But why is it so ? Isn't there a possibility to modify some parameters in 'Psycho' in order to get correct response times ?

I prefer to use 'Psycho' because it has some definite advantages, for instance the possibility of a fast execution of experiments in full screen with no border on a second screen, using the quick execution process launcher (double blue arrow in the tool bar), and it is very useful for me in some highly interactive conditions.

Thank you in advance for any idea or knowledge transfer ...

Gérard

sebastiaan

HI Gérard,

In what sense are the response times 'incorrect' when you're using the psycho backend? Can you give an example of an experiment + response times that you'd consider incorrect?

Cheers!

Sebastiaan

gerhono

Thank you, Sebastiaan.

While reviewing all the parameters of the program, I changed also the PC and it appears that the experiment runs fine on the desktops but not on the laptop that I use for development. The "incorrect" timing was a problem of delay (up to 10 seconds) before the display of two .jpg images in a simple test program that switches between two sketchpads according to a keypress. Now, I am sure that the problem comes from the computer itself. I have to investigate further because that laptop meets the requirements of speed and power. It must be something else.

Because I try to progress in learning Python, I have also made a script that does the same job and the problem is similar. While testing that version, I have seen that I can reference the image files directly from a specific location on the drive and that I don't need the file pool. Apparently, it does not change the access time to the files. Is it correct ?

Best,

Gérard

sebastiaan

> While testing that version, I have seen that I can reference the image files directly from a specific location on the drive and that I don't need the file pool. Apparently, it does not change the access time to the files. Is it correct ?

That is correct! There is no fundamental difference between files in the pool and files elsewhere, except for the fact that the file pool is bundled with experiment when you save it.