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RE: Dot Probe Stimuli/Probe Display Times

Marguerite — Tue, 01 Nov 2011 10:02:44 GMT

Thank you so much for your rapid response! I see why my words weren't presenting at all.

Thanks again for your assistance.

Veronica

RE: Dot Probe Stimuli/Probe Display Times

Dave — Tue, 01 Nov 2011 09:54:33 GMT

[quote]/ stimulustimes = [0=fixation; 500=erasefixation, pleasantleft, unpleasantright; 1500=erasewords, probeleft][/quote]

Here's what the above stimulustimes definition does:

0 ms into the trial: display fixation
500 ms into the trial: remove fixation, display pleasant and unpleasant stimuli
1500 ms into the trial: remove pleasant and unpleasant words, display probe

So, the fixation duration is 500ms (0 to 500), pleasant and unpleasant stims are displayed for 1000ms (500 to 1500), probe is displayed infinitely until subject responds (1500 to ???). See the documentation for the /stimulustimes attribute for details. You should be able to take it from there.

Regards,

~Dave

Dot Probe Stimuli/Probe Display Times

Marguerite — Tue, 01 Nov 2011 09:46:14 GMT

Hello,

I'm trying to program a dot probe study and am having some difficulties with the display times.

For starters, is there a way to keep the probe displayed until the participants input a response? Or, is there a way to modify the display time of the probe? Should I be using a "stimulus timeout" command to accomplish this? Currently I'm using the dot probe template and I'm finding that the probe disappears too quickly.

Similarly, I would like to adjust the stimuli display time so that it disappears after 500ms, instead of the preset of 1500ms. However, when I change the setting from 1500 to 500, the stimuli don't seem to appear at all.

Here is my presentation script if it helps:

/ correctresponse = ("e")

/ validresponse = ("e", "i")

/ stimulustimes = [0=fixation; 500=erasefixation, pleasantleft, unpleasantright; 1500=erasewords, probeleft]

</trial>

Many thanks.

Marguerite