RT-dependent stimulus presentation (case 23172)

[mcastro]

Hello,

I want to build a task wherein the RT to one stimulus determines the duration of another, later stimulus. In other words, a subject would respond as fast as possible to the first stimulus with a key press, and the time that response takes would fall into one of two categories: fast or slow. A fast RT would be followed by a longer presentation of the second stimulus, while a slow RT would be followed by a shorter presentation.

How can I use participant RTs to determine the duration of the second stimulus?

Thank you for your assistance!