I have been able to use a licenced copy of superlab on my institution and I was trying to present visual stimuli jpeg and bmp images for 100ms interval.
The problem is that stimuli are presented with distorted edges initially and then the image clears. Imagine for instance when you navigate on the internet to see a picture that progressivelly loads. First is unclear and blurry and as the explorer downloads the image, the image becomes clearer and clearer.
This is what I experienced today when I was preparing a tachistoscopic experiment (an experiment where stimuli have to be presented for brief intervals).
For that kind of experiments the experimenter wants to have clear image. Coupled with the problem of monitor refresh rate, the way superlab behaves is not helpful.
The monitor I used was an LCD monitor with 60hz refresh rate and this happens for both jpeg and bmp files. I wouldnt think that this could be a problem with the processor which is a relativelly good pentium 4, or memory.
Could it be that it is a hardware problem? Could it be that another piece of microsoft or other software interacts with superlab and generates this problem? Or there is something I can do in superlab to fix the problem?
I tried clearing the screen before presenting stimuli, loading all trials to memory before initiating the experiment, I have tested the buffer setting etc (unfortunatelly I do not have superlab on my home PC to use the exact terms).
So, do you have any advice can I do anything?