masked priming

Hello, is it possible to use Superlab to design a classical masked priming experiment, e.g. 500ms - mask; 50ms - prime; 50ms - blank space; 150ms - mask; 500ms - target as a single event??? Thank you.

Yes, it is possible.

Please be aware that as your exposure times go down to double digits, e.g. 50 milliseconds, your screen’s refresh rate starts to matter more and more. You can present a picture only in multiples of refresh cycles. For example, if your monitor has a refresh rate of 60Hz (i.e 60 times a second), then each cycle’s duration is 1000 milliseconds divided by 60, which comes to 16.66 milliseconds. So you can present pictures for 16.66, 33.33, and luckily enough for you :), 49.98 milliseconds. But you cannot do 20, 30, or 40 milliseconds.

Im also using a masked prime task, in particular a response inhibition (RI) task, which is interrupted at various points by 2 different prospective memory tasks. One of which interrupts the participants RI task, the other is self-initiated by the participant.
Building the response inhibition task on Psyscope was doable, however trying to include a user initiated button press which would stop the current block of RI, initiate a prospective memory task, and upon completion restart the RI task is proving to be very difficult.
I was hoping you may have some idea on how to do this.
Any help you could give would be greatly appreciated!

Unfortunately, this is not a capability of SuperLab.