Millisecond Forums » Millisecond Forums » Inquisit 2.0 » recording stiumuli name/stimulusitem in data file

recording stiumuli name/stimulusitem in data file

ciyee — Fri, 28 Oct 2011 14:17:12 GMT

I am trying to run a reaction time task using the web version of Inquisit. For this task we have different pictures that the participant sees. We have to know which of the pictures each participant saw for the trials. In our data file, we specify in the experimental file

/columns =[date time subject blocknum trialnum trialcode response latency stimulusitem correct]

where "stimulusitem" I believe is what is supposed to tell us if they saw

/ 35 = "dotsame-dark--27.JPG"

/ 36 = "dotsame-dark--33.JPG"

However, when we tested the data, the data file gave us "*" under the column "stimulusitem". Could someone please help us determine what we need to add in the experimental file program to maek ti record which picture they saw? It can be either the exact name fo the picture we give it, or just some way to identify the picture? Thank you so much,

-Claire

RE: recording stiumuli name/stimulusitem in data file

Dave — Fri, 28 Oct 2011 14:17:12 GMT

Your trials display *two* stimuli:

/ stimulusframes = [1=fixation; 22=poswhite]

and

/ stimulusframes = [1=fixation; 22=negwhite]

respectively. Thus your /columns attribute must include *two* instances of 'stimulusitem':

/ columns = [..., stimulusitem, stimulusitem, ...]

With only *one* instance of 'stimulusitem' only the *first* stimulus (i.e., fixation) will be logged. It's not an error, it's the expected behavior (as detailed in the documentation topics and forum threads I referred you to).

Regards,

~Dave

RE: recording stiumuli name/stimulusitem in data file

ciyee — Fri, 28 Oct 2011 13:44:30 GMT

Thank you so much for your response. We have the stimulusframes= [1=fixation} part in our program as you can see and it is still giving us the " * " error.

<trial poswhitetrial>

/ pretrialpause = 1000

/ validresponse = ("q","p")

/ correctresponse = ("p")

/ stimulusframes = [1=fixation; 22=poswhite]

/ posttrialpause = 200

</trial>

<trial negwhitetrial>

/ pretrialpause = 1000

/ validresponse = ("q","p")

/ correctresponse = ("q")

/ stimulusframes = [1=fixation; 22=negwhite]

/ posttrialpause = 200

</trial>

This is what the data file looks like:
date    time    subject    blocknum    trialnum    trialcode    response    latency    stimulusitem1    correct
102811    12:39    1    3    1    negwhitetrial    16    1603        1
102811    13:11    9999    3    1    negwhitetrial    25    499    *    0
102811    13:11    9999    3    2    negwhitetrial    16    265    *    1
102811    13:11    9999    3    3    poswhitetrial    25    225    *    1
102811    13:11    9999    3    4    poswhitetrial    25    218    *    1
102811    13:11    9999    3    5    poswhitetrial    25    227    *    1
102811    13:11    9999    3    6    negwhitetrial    25    204    *    0
102811    13:11    9999    3    7    negwhitetrial    16    206    *    1
102811    13:11    9999    3    8    negwhitetrial    16    216    *    1
102811    13:11    9999    3    9    poswhitetrial    16    81    *    0

I'm sorry to be so difficult, I just apparently don't understand exactly what we're supposed to fix in the script because I thought the "fixation" part was exactly what the solution was for the question you referred me to? Do we need to add "stiumulsitem" 72 times in the line where we list how many/what we want in the data columns line? They only see one picture at a time, with randomly selected pictures for each of the 72 trials.

-Claire

RE: recording stiumuli name/stimulusitem in data file

Dave — Fri, 28 Oct 2011 13:03:22 GMT

See https://www.millisecond.com/forums/Topic5105.aspx#5105 and the documentation for Inquisit's default data recording scheme.

Regards,

~Dave