added delay when inputting a response in the scanner


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nrouhani
nrouhani
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hello, 

i am using an inquisit script for a scanning experiment. while some delays are accounted for (when tested on a separate computer), there is an added delay (about 100 ms) that occurs for the trial below when it is being run in the scanner and only when there is a response. this delay does not occur when testing outside of the scanner (with or without response). is there any way to prevent this or account for it? thank you!

computer specs: Dell Precision 5820: Intel i9-1090X 3.7Ghz; 16GB DDR4; 512TB PCIe NVMe SSD; ATI Radeon Pro W6600 8GB, Windows 10 64-bit, Inquisit 5.0.14.

<trial new_art>
/ ontrialbegin = [
    values.artSample = list.newList_art.nextvalue;
    values.trialtimestamp = trial.new_art.timestamp;
]
/ stimulustimes = [0=blank, artP; 3000=newOld, memScale, mem_leftHand, mem_rightHand]
/ validresponse = ("0","1","2","3","4","5","6","7","8","9")
/ beginresponsetime = 3000
/ trialduration = 5000
/ ontrialend = [values.trialelapsedtime = trial.new_art.elapsedtime]
/ branch = [
trial.mem_iti
]
</trial>
GO

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nrouhani - 2 Years Ago
Dave - 2 Years Ago
nrouhani - 2 Years Ago
Dave - 2 Years Ago
                     as i mentioned before, we are using the intial timestamp...
nrouhani - 2 Years Ago
                         (to be crystal clear, we use the initial timestamp for each trial and...
nrouhani - 2 Years Ago
                             > i'm not sure how looking at the data will help you in this case,...
Dave - 2 Years Ago
                                 it's a button box within the fMRI scanner. to be honest, i don't think...
nrouhani - 2 Years Ago
                                     There's nothing wrong with the code per se, as you've seen for...
Dave - 2 Years Ago
                                         i can tell you that it reliably happens when someone inputs a response...
nrouhani - 2 Years Ago
                                             > would setting /audit = true in data give more precise...
Dave - 2 Years Ago

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