RT from end of stimulus rather than start of stimulus?

[spaulding200]

I have about 400 voice recordings, all of different durations, that I am inputing into directRT to play. For my study, I want RT to be recorded from the offset of each audio voice recording to the button press response. How do I make this happen as directRT typically records from onset of stimulus to button press response, rather from when stimulus is done playing to button press response.

[jarvis24]

Tough task. DirectRT has no way to detect the offset. You would need to read that under each file's audio properties or look at them in a wave editor like Audacity (see www.audacity.com) if you want to make a relatively precise detection of the amplitude fall off (it's always a judgment call because it's usually gradual).