Millisecond Forums

Randomization of blocks and "Sub-Blocks".

https://forums.millisecond.com/Topic31431.aspx

By DannyPilgrim - 4/28/2021

Hello everyone,

I hope you understand my question.
I have three separate blocks which contain three Sub-blocks each:

Block_a
- a1 = 96 Trials
- a2 = 96 Trials
- a3 = 96 Trials

Block_b
- b1 = 96 Trials
- b2 = 96 Trials
- b3 = 96 Trials

Block_c
- c1 = 96 Trials
- c2 = 96 Trials
- c3 = 96 Trials

I'd like to randomize the big blocks (Block_a, Block_b, Block_c) and those inside of them as well. The picture visualizes what I mean.

On which layer do I have to define this? On the <block> or <expt> layer?

Would it be something like that in the <block> layer:
<block Block_a>
/ preinstructions = (htmlpage.Übung2)
/ trials = noreplace=[1-96 =noreplace(...)]
/ trials = [1-96 =noreplace(...)]
/ trials = [1-96 =noreplace(...)]
</block>
(The trials themselves are randomized in each Sub-Block with =noreplace)

Or do I have to define all Sub-Blocks and arrange them within the <expt> layer?

I know how to randomize blocks in the <expt> but right now I cannot define it how I need it.

Best Regards,
Danny
By DannyPilgrim - 4/28/2021

By Dave - 4/28/2021

 
DannyPilgrim - 4/28/2021

You have to do something like this:

<values>
/ a_blockcount = 0
/ b_blockcount = 0
/ c_blockcount = 0
</values>

<expt>
/ blocks = [1-3 = noreplace(block.a, block.b, block.c)]
</expt>

<block a>
/ branch = [
    //select a random sub-block
    list.a_sub.nextvalue;
]
</block>

// three "sub-blocks"
<list a_sub>
/ items = (block.a1, block.a2, block.a3)
</list>

<block a1>
/ onblockbegin = [
    values.a_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.a_blockcount < 3) {
        list.a_sub.nextvalue;
    }
]
</block>

<block a2>
/ onblockbegin = [
    values.a_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.a_blockcount < 3) {
        list.a_sub.nextvalue;
    }
]
</block>

<block a3>
/ onblockbegin = [
    values.a_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.a_blockcount < 3) {
        list.a_sub.nextvalue;
    }
]
</block>

<block b>
/ branch = [
    //select a random sub-block
    list.b_sub.nextvalue;
]
</block>

// three "sub-blocks"
<list b_sub>
/ items = (block.b1, block.b2, block.b3)
</list>

<block b1>
/ onblockbegin = [
    values.b_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.b_blockcount < 3) {
        list.b_sub.nextvalue;
    }
]
</block>

<block b2>
/ onblockbegin = [
    values.b_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.b_blockcount < 3) {
        list.b_sub.nextvalue;
    }
]
</block>

<block b3>
/ onblockbegin = [
    values.b_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.b_blockcount < 3) {
        list.b_sub.nextvalue;
    }
]
</block>

<block c>
/ branch = [
    //select a random sub-block
    list.c_sub.nextvalue;
]
</block>

// three "sub-blocks"
<list c_sub>
/ items = (block.c1, block.c2, block.c3)
</list>

<block c1>
/ onblockbegin = [
    values.c_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.c_blockcount < 3) {
        list.c_sub.nextvalue;
    }
]
</block>

<block c2>
/ onblockbegin = [
    values.c_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.c_blockcount < 3) {
        list.c_sub.nextvalue;
    }
]
</block>

<block c3>
/ onblockbegin = [
    values.c_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.c_blockcount < 3) {
        list.c_sub.nextvalue;
    }
]
</block>

<trial mytrial>
/ stimulusframes = [1=mytext]
/ validresponse = (57)
</trial>

<text mytext>
/ items = ("This is block <%script.currentblock%>.")
</text>
By DannyPilgrim - 4/28/2021

 
Dave - 4/28/2021
 
DannyPilgrim - 4/28/2021

You have to do something like this:

<values>
/ a_blockcount = 0
/ b_blockcount = 0
/ c_blockcount = 0
</values>

<expt>
/ blocks = [1-3 = noreplace(block.a, block.b, block.c)]
</expt>

<block a>
/ branch = [
    //select a random sub-block
    list.a_sub.nextvalue;
]
</block>

// three "sub-blocks"
<list a_sub>
/ items = (block.a1, block.a2, block.a3)
</list>

<block a1>
/ onblockbegin = [
    values.a_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.a_blockcount < 3) {
        list.a_sub.nextvalue;
    }
]
</block>

<block a2>
/ onblockbegin = [
    values.a_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.a_blockcount < 3) {
        list.a_sub.nextvalue;
    }
]
</block>

<block a3>
/ onblockbegin = [
    values.a_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.a_blockcount < 3) {
        list.a_sub.nextvalue;
    }
]
</block>

<block b>
/ branch = [
    //select a random sub-block
    list.b_sub.nextvalue;
]
</block>

// three "sub-blocks"
<list b_sub>
/ items = (block.b1, block.b2, block.b3)
</list>

<block b1>
/ onblockbegin = [
    values.b_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.b_blockcount < 3) {
        list.b_sub.nextvalue;
    }
]
</block>

<block b2>
/ onblockbegin = [
    values.b_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.b_blockcount < 3) {
        list.b_sub.nextvalue;
    }
]
</block>

<block b3>
/ onblockbegin = [
    values.b_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.b_blockcount < 3) {
        list.b_sub.nextvalue;
    }
]
</block>

<block c>
/ branch = [
    //select a random sub-block
    list.c_sub.nextvalue;
]
</block>

// three "sub-blocks"
<list c_sub>
/ items = (block.c1, block.c2, block.c3)
</list>

<block c1>
/ onblockbegin = [
    values.c_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.c_blockcount < 3) {
        list.c_sub.nextvalue;
    }
]
</block>

<block c2>
/ onblockbegin = [
    values.c_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.c_blockcount < 3) {
        list.c_sub.nextvalue;
    }
]
</block>

<block c3>
/ onblockbegin = [
    values.c_blockcount += 1;
]
/ trials = [1=mytrial]
/ branch = [
    // if we stil have further sub-blocks to run, select the next one at random
    if (values.c_blockcount < 3) {
        list.c_sub.nextvalue;
    }
]
</block>

<trial mytrial>
/ stimulusframes = [1=mytext]
/ validresponse = (57)
</trial>

<text mytext>
/ items = ("This is block <%script.currentblock%>.")
</text>



Thank you very much, Dave!
That helps alot!