Feedback for each trial

[Ice Tsui]

hello,

I would like to know that how to add feedback to each trial if I want to
inform the subject that he/she has done incorrectly in the previous trial by a
"beep" sound, but no feedback if the subject done correctly for the trial.

Best Regards,
Ice

______________________________________________________________________
Tsui Sum Yin Ice
Mobile: 93221306
Email: icetsui at graduate.hku.hk
______________________________________________________________________