Millisecond Forums

This is the nonincentive trial from the script you attached:

<trial nonincentive>
/inputdevice = mousekey
/validresponse = (lbuttondown, rbuttondown)
/correctresponse = (lbuttondown, rbuttondown)
/ responsemessage = (lbuttondown,incentivecue, 0)
/ responsemessage = (rbuttondown,incentivecue, 0)
/ ontrialbegin = [
    values.incentive_condition = 2;
    values.iti=0;
    values.targetduration = expressions.determineDuration;
    values.delayduration = list.delay.nextvalue;
    trial.nonincentive.insertstimulustime(shape.eraser, values.cueduration);
    trial.nonincentive.insertstimulustime(port.erasereeg, values.cueduration);
    trial.nonincentive.insertstimulustime(shape.target, (values.cueduration + values.delayduration));
    trial.nonincentive.insertstimulustime(port.targeteeg, (values.cueduration + values.delayduration));
]
/ stimulustimes = [0 = nonincentivecue, total]
/ beginresponsetime = values.cueduration + values.delayduration
/ responseinterrupt = immediate
/ timeout = values.cueduration + values.delayduration + values.targetduration
/ monkeyresponse = (values.responsekey)
/ ontrialend = [
    trial.nonincentive.resetstimulusframes();
    values.iti = values.trialduration - values.cueduration - values.delayduration - trial.nonincentive.latency - values.feedbackduration;
    if (values.exp_condition == 0) {
        values.count_NonIncentiveControl += 1;
        values.countcorrect_NonIncentiveControl += trial.nonincentive.correct;
        list.successNonIncentive_Control.insertitem(trial.nonincentive.correct, 1);
    } else if (values.exp_condition == 1) {
        values.count_NonIncentiveReward += 1;
        values.countcorrect_NonIncentiveReward += trial.nonincentive.correct;
        list.successIncentive_Reward.insertitem(trial.incentive.correct, 1);
    } else if (values.exp_condition == 2) {
        values.count_NonIncentivePunishment += 1;
        values.countcorrect_NonIncentivePunishment += trial.nonincentive.correct;
        list.successNonIncentive_Punishment.insertitem(trial.nonincentive.correct, 1);
    } ;
]       
/ branch = [trial.feedback]
</trial>

Where do you send the nonincentivecue EEG marker? It appears you don't. Why? All you send is the target EEG marker. Add the nonincentive marker as I have explained previously, please.

Then, you'll probably want to define _different_ markers to indicate response. Here,

<trial nonincentive>
/inputdevice = mousekey
/validresponse = (lbuttondown, rbuttondown)
/correctresponse = (lbuttondown, rbuttondown)
/ responsemessage = (lbuttondown,incentivecue, 0)
/ responsemessage = (rbuttondown,incentivecue, 0)
...

#1: What does "incentivecue" do in <trial nonincentive>?
#2: "incentivecue" is not a port marker, and neither is nonincentivecue. Those are <shape> elements. Your port elements are called incentivecueeeg and nonincentivecueeeg respectively.

<shape incentivecue>
/ shape = rectangle
/ size = (values.stimsize * 0.75, values.stimsize)
/ position = (50%, 50%)
/ color = red
</shape>
<port incetivecueeeg>
/ port = LPT1
/ subport = data
/ items = ("00000001")
</port>
<shape nonincentivecue>
/ shape = rectangle
/ size = (values.stimsize * 0.75, values.stimsize)
/ position = (50%, 50%)
/ color = red
</shape>
<port nonincetivecueeeg>
/ port = LPT1
/ subport = data
/ items = ("00000011")
</port>

#3: You almost certainly will want to send those markes for longer than just 0 ms, since it's not guaranteed that there will be a substantive post trial pause. Set it to a minimum of, say, 50 ms.

Hi Dave again,

I want to change number of incentive and non-incentive cues on trials like 30 incentive and 70 non incentive cues instead of original 20-80.. I think it is possible but I could not do it. I modified 1-80 like 1-70 but it did not solve the problem. How can I do it? I searched on the forum but could not see what I can do.

Can you please have a look at?

/ trials = [1-70 = noreplace(incentive, nonincentive, nonincentive, nonincentive)]

Thank you so much

Özge

If you want 70 trials total, with 30 incentive and 40 nonincentive, then you need to specify the proporions accordingly in your noreplace() pool.

/ trials = [1-70 = noreplace(incentive, incentive, incentive, nonincentive, nonincentive, nonincentive, nonincentive)]

i.e. 3 to 4.

No I still want 100 trials total each.. including 30 incentive and 70 non incentive cue.. What should I write to the script?

Thanks

Then your /trials attribute needs to read

/ trials = [1-100 = noreplace(incentive, incentive, incentive, nonincentive, nonincentive, nonincentive, nonincentive, nonincentive, nonincentive, nonincentive)]

obviously.

1-100 -> 100 trials

sampled randomly without replacement from a pool

noreplace(incentive, incentive, incentive, nonincentive, nonincentive, nonincentive, nonincentive, nonincentive, nonincentive, nonincentive)

with a 3 (incentive) to 7 (nonincentive) ratio.

How that works is easy to understand:

/trials = [1-12 = noreplace(a, b)]

will run 12 trials, with trial "a" and trial "b" in equal proportions, 1 to 1.

/trials = [1-12 = noreplace(a, b, b)]

would also run trials, but with a 1 to 2 ratio, giving you only 4 "a" trials but twice as many "b" trials, i.e. 8 "b" trials.

Hi Dave, 

Sorry to inform you that it is not working as I wish. I understand what you mean and it makes sense, however when I rearranged the script as you wrote, I get 100 nonincentive cues and 30 incentive cues making a total of 130 trials. I do not know where I did go wrong. 

/ trials = [1-100 = noreplace(incentive, incentive, incentive, nonincentive, nonincentive, nonincentive, nonincentive, nonincentive, nonincentive, nonincentive)] is not working how I wanted. 

I want to keep the MID task original (100 trials in total), I only want to increase incentive cue number from 20 to 30 and decrease nonincentive cue number from 80 to 70..still making a total of 100 trials in each condition. Can you please have a look at?

Thank you very very much.

Özge

You are missing one thing:

- 100 trials
- 20 incentive trials
- 80 nonincentive trials
=> The order is randomized with the constraint that incentive trials cannot be presented consecutively

How does the script realize that constraint? It does so by invoking an additional nonincentive trial via /branch after every incentive trial:

<trial feedback>
/ ontrialbegin = [
if (values.feedback == 1 || values.feedback == 2 || values.feedback == 5) {
text.feedback.textcolor = green;
} else {
text.feedback.textcolor = red;
};
]
/ posttrialpause = values.fixediti
/ stimulusframes = [1 = feedback,feedbackeeg, total]
/ timeout = values.cueduration + values.targetduration
/ posttrialpause = values.iti
/ recorddata = false
/ branch = [
if (values.incentive_condition == 1) {
trial.nonincentive;
};
]
</trial>

That's why you get more. Either ditch the constraint by removing the /branch or lower the amount of nonincentive trials in your <block>s' /trials accordingly.