Combining two visual experiments

Hello,

I have two different experiments (one is a “change blindness task” and the other one is an “optokinetic stimulation of dots”) both written in psychtoolbox.

I want to combine these two task while running (i.e., to superimpose change blindness task on the OKS paradigm). I would be so thankful if you can let me know about possible ways to combine these two experiment? Or any sources that can be of help to learn how can I approach this.

Best regards,
Parishad