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Dolly_Wen
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Join Date: Nov 2013
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light sensor always on during the presentation, Posted December 19th, 2013 #1
Hi, we are using the black lightsensor to detect the onset of the white square with a black background. But today we found that stimtracker sent the onset signal continuously during the presetation of critical stimuli. We have no idea what is wrong. We haven't changed any settings and it never happened before. Can anybody help?
Thanks.
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Hisham
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Posted December 19th, 2013 #2
It seems like you had the right setup. Is the light sensorís LED on StimTrackerís front panel turning on when you expect it to?
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Dolly_Wen
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Posted December 19th, 2013 #3
Hi, the light '1' of photocell is on when the white dot appears so is the light of marker on stimtracker.
I think it may have something to do with the threshold of the light sensor. Do you have any recommended threshold?
I just found out that I have failed to post a new thread asking about the threshold...
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Dolly_Wen
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Posted December 19th, 2013 #4
p.s. our threshold is set at 99. Because we cannot find any stimtracker manual available, we have no idea what this figure means...
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Hisham
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Posted December 20th, 2013 #5
The displayed number is just a percentage. It is impossible to recommend a threshold because all monitors are different, and they can be set to different brightness levels.

The documentation is all online, there is no printed manual. You might find the Using StimTracker page helpful. See the main StimTracker support page for a list of all available documents.
Last edited by Hisham; December 24th, 2013 at 10:29 AM..
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Dolly_Wen
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Posted January 5th, 2014 #6
Hi, I don't think the website containing something that I am looking for. If no recommended threshold is possible, how can I know that which threshold is the best for our monitor?
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Hisham
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Posted January 6th, 2014 #7
Please see the section Adjusting Thresholds on the Using StimTracker page.
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