[open] how to create feedback with different proportions
Hello, we use a free choice task in which one of four relevant keys can cause an effect on the screen (a red circle changes its color to white and disappear).
We have a problem in creating different proportions of feedback to each one of the relevant keys.
for instance, a specific key will cause the effect on the screen in only 70% of the times it is pressed.
any suggestion or example how to do it will be very helpful