Customized the display duration of a list of randomly presented stimulus

Builder
1

I am building an experiment with different prime-target pairs.

The respondent are being shown a prime object then give response to the target object by clicking button.

I would like to customized the duration of the presented prime.

E,g,
Prime Duration
A 0.3s
B 0.6s
C 0.3s
D 0.3s
E 0.6s
etc…

How can I do which I have built a loop of the list of randomized pairs?

Thanks!

2

@Yan_Lam_Pang, in Builder you could add a column to your conditions file called Dur and in the duration of your stimuli, add $Dur as the duration of your target object.