Millisecond Forums

Hi All,

I have quite interesting issue and I have no idea how to solve it.

I am using modified version of Delay & Probability Discounting Procedure (Richards et al., 1999) from Inquisit Library.

I have created three modification of this procedure labeled: DD_N; DD_S  DD_W.
I have run this three procedure in a row using batch element i.e in such an order DD_N; DD_S  DD_W.

To test my procedure I conduct pilot study on 35 respondents

When I analyzed data  I notice that for nine participants in some of trials named t4 and p5 there is response "erasescreen".
The problem is that this response is not a valid response in this trials i.e is not listed under validresponse attribute. So I have no idea how this response can be recorded.
Erasescreen is a stimuli presented to erase previous stimuli.
What more, this is not systematic error it occurs randomly only for trials p5 and t4 among ten trials: p1 p2 p3 p4 p5p t1 t2 t3 t4 t5.

I suppose that this error is somehow produced by batch element, but it is only my intuition.
I configure batch to run procedure in this order  DD_N; DD_S  DD_W, and I have never found this error in data from DD_N procedure (run as first) but only in DD_D  run as second) and DD_W ( run as third), and this is only pattern I can find in this errors.

I would like to ask if you have  any idea how to solve this issue?

Please find attached my procedures.