accuracy calculation ( feedback ) without the responce none
First of all, thank you to all the members of this community. Opensesame is a really great tool but without the possibility of consulting the discussions in this forum it would have taken me much longer to create my experiments.
I will now move on to the description of my problem.
My trials are as follow:
- Inter stimulus interval
- sketchpad with my stimuli (1000ms)
- sketchpad with the previous stimuli plus a question (0ms)
- keyboardresponse1 (2000ms)
- sketchpad with questiton and without stimuli (0) -- show if response is none
- keyboard response2 (infinite) -- show if response is none
The problem concerns the calculation of accuracy. In each trial subjects can respond from the appearance of the second scketchpad. If they don't respond in time, a third scketchpad will appear, the same as the previous one but with only the question and without the stimulus to be analysed (the scketchpads are so arranged because I want the subjects to be able to see the stimulus a maximum of 2000ms after the question appears).
When subjects do not make it in time to respond in the second scketchpad (response is none) I do not want that keyboard responce to affect the accuracy calculation. In these cases I would like it to calculate only the responses given to the keyboard response2.
Is there any way to say "don't use 'none' responses in the accuracy calculation?"
Thanks in advance!