Millisecond Forums

Hello,

I have a problem with a randomize prime presentation. I have 8 primes, 9 positive and 9 negative targets. I've already looked at http://www.millisecond.com/forums/Topic2270.aspx but although I thougt, that I understand the procedere, it doesn't work.

So here is my script:

<counter prime>
/ select = noreplace
/ items = (
1,1,1,1,1,1,1,1,1,

2,2,2,2,2,2,2,2,2,

3,3,3,3,3,3,3,3,3,

4,4,4,4,4,4,4,4,4,

5,5,5,5,5,5,5,5,5,

6,6,6,6,6,6,6,6,6,

7,7,7,7,7,7,7,7,7,

8,8,8,8,8,8,8,8,8)
</counter>

<counter target_positive>
/ select = current(prime)
/ items = (
1,2,3,4,5,6,7,8,9,

1,2,3,4,5,6,7,8,9,

1,2,3,4,5,6,7,8,9,

1,2,3,4,5,6,7,8,9,

1,2,3,4,5,6,7,8,9,

1,2,3,4,5,6,7,8,9,

1,2,3,4,5,6,7,8,9,

1,2,3,4,5,6,7,8,9)
</counter>

<counter target_negative>
/ select = current(prime)
/ items = (
1,2,3,4,5,6,7,8,9,

1,2,3,4,5,6,7,8,9,

1,2,3,4,5,6,7,8,9,

1,2,3,4,5,6,7,8,9,

1,2,3,4,5,6,7,8,9,

1,2,3,4,5,6,7,8,9,

1,2,3,4,5,6,7,8,9,

1,2,3,4,5,6,7,8,9)
</counter>

<trial prime>
/stimulusframes = [1-19=prime; 20-27=blank ;28=noreplace(target_positiv, target_negativ)]
/validresponse = ("a", "l")
/response = timeout (2200)
/posttrialpause = (2500)
</trial>

<trial break>
/stimulusframes = [1=blank]
/response = timeout (60000)
</trial>

<block prime>
/screencolor = (255,255,255)
/preinstructions = (Berufe)
/trials = [1= clock; 2-37=noreplace(prime); 38=break; 39=clock; 40-75=noreplace(prime); 76=break;
77=clock; 78-113=noreplace(prime); 114=break; 115=clock; 116-151=noreplace(prime)]
</block>

The Block is running, but I always find some repetitions.

Can it be because I use the targets in another block before?

Thanks for help, Rita