Millisecond Forums » Millisecond Forums » Inquisit 5 » StroopTask - How to repeat practice block, how to randomize items, How to program a fixation cross?

StroopTask - How to repeat practice block, how to randomize items, How to program a fixation cross?

DannyPilgrim — Wed, 12 Feb 2020 09:20:49 GMT

Hello everyone,

I have never worked with Inquisit before so These are actually more General Questions, I suppose:
I have programmed a Stroop Task so far with a Practice block which consists of 8 items. How can I repeat the block, when the subjects have made 4 Errors? (50/50)

Also I would like to know how I can randomize all my items within the blocks

Is it possible to Show a Fixation cross to the subjects before every Trial for 500ms?

Thank you for your help!

RE: StroopTask - How to repeat practice block, how to randomize items, How to program a fixation cross?

DannyPilgrim — Wed, 12 Feb 2020 09:20:49 GMT

+x[quote]

[b]Dave - 1/29/2020[/b]
+x[quote]

[b]DannyPilgrim - 1/29/2020[/b]
uHello everyone,

I have never worked with Inquisit before so These are actually more General Questions, I suppose:
I have programmed a Stroop Task so far with a Practice block which consists of 8 items. How can I repeat the block, when the subjects have made 4 Errors? (50/50)

Also I would like to know how I can randomize all my items within the blocks

Is it possible to Show a Fixation cross to the subjects before every Trial for 500ms?

Thank you for your help!

[/quote]

Generally, see the tutorials if you're new to creating tasks with Inquisit. Those will introduce you to the most important concepts: https://www.millisecond.com/support/docs/v5/html/tutorials/tutorials.htm

To repeat a <block> based on performance, you can use built-in performance metrics or build your own, more complex ones using <values> and /ontrialend logic. Then /branch based on the performance. In a nutshell:

> How can I repeat the block, when the subjects have made 4 Errors? (50/50)

<block practice>
...
/ trials = [1-8 = noreplace(congruenttrial, incongruenttrial)]
/ branch = [ if (block.practice.percentcorrect <= 50) block.practice]
...
</block>

https://www.millisecond.com/support/docs/v5/html/language/properties/percentcorrect.htm

> Also I would like to know how I can randomize all my items within the blocks

To randomize the order of trials, use the noreplace() selection mode in the block's /trials attribute

/ trials = [1-8 = noreplace(congruenttrial, incongruenttrial)]

To randomize items displayed by a <text> element in your trials, set the <text> element's /select attribute to noreplace

https://www.millisecond.com/support/docs/v5/html/language/attributes/select.htm

> Is it possible to Show a Fixation cross to the subjects before every Trial for 500ms?

You typically simply do this by displaying a fixation stimulus per the <trial>'s /stimulustimes as needed:

<trial congruenttrial>
/ stimulustimes = [0=fixation; 500=clearscreen, congruentstimulus, ....]
...
</trial>

<text fixation>
/ items = ("+")
....
</text>

https://www.millisecond.com/support/docs/v5/html/language/attributes/stimulustimes.htm

Also see the various Stroop scripts available in the library: https://www.millisecond.com/download/library/stroop/
[/quote]

Thank you very much!

I programmed it with your instructions and now it works!

Thank you for your help!

RE: StroopTask - How to repeat practice block, how to randomize items, How to program a fixation cross?

Dave — Wed, 29 Jan 2020 12:48:29 GMT

+x[quote]

[b]DannyPilgrim - 1/29/2020[/b]
uHello everyone,

I have never worked with Inquisit before so These are actually more General Questions, I suppose:
I have programmed a Stroop Task so far with a Practice block which consists of 8 items. How can I repeat the block, when the subjects have made 4 Errors? (50/50)

Also I would like to know how I can randomize all my items within the blocks

Is it possible to Show a Fixation cross to the subjects before every Trial for 500ms?

Thank you for your help!

[/quote]

Generally, see the tutorials if you're new to creating tasks with Inquisit. Those will introduce you to the most important concepts: https://www.millisecond.com/support/docs/v5/html/tutorials/tutorials.htm

To repeat a <block> based on performance, you can use built-in performance metrics or build your own, more complex ones using <values> and /ontrialend logic. Then /branch based on the performance. In a nutshell:

> How can I repeat the block, when the subjects have made 4 Errors? (50/50)

<block practice>
...
/ trials = [1-8 = noreplace(congruenttrial, incongruenttrial)]
/ branch = [ if (block.practice.percentcorrect <= 50) block.practice]
...
</block>

https://www.millisecond.com/support/docs/v5/html/language/properties/percentcorrect.htm

> Also I would like to know how I can randomize all my items within the blocks

To randomize the order of trials, use the noreplace() selection mode in the block's /trials attribute

/ trials = [1-8 = noreplace(congruenttrial, incongruenttrial)]

To randomize items displayed by a <text> element in your trials, set the <text> element's /select attribute to noreplace

https://www.millisecond.com/support/docs/v5/html/language/attributes/select.htm

> Is it possible to Show a Fixation cross to the subjects before every Trial for 500ms?

You typically simply do this by displaying a fixation stimulus per the <trial>'s /stimulustimes as needed:

<trial congruenttrial>
/ stimulustimes = [0=fixation; 500=clearscreen, congruentstimulus, ....]
...
</trial>

<text fixation>
/ items = ("+")
....
</text>

https://www.millisecond.com/support/docs/v5/html/language/attributes/stimulustimes.htm

Also see the various Stroop scripts available in the library: https://www.millisecond.com/download/library/stroop/