Millisecond Forums

I believe the issue is that the response property returns the scancode of the key that was pressed, not the character value. The following conditional would thus never evaluate to true:

/ ontrialbegin = [if(trial.trial_ID1.response == "s") ...]

However, the following would be true if the subject pressed the "s" key:

/ ontrialbegin = [if(trial.trial_ID1.response == 31...]

because the scancode for "s" is 31. You can figure out scan codes for other keys using the Scancode tool on the Tools menu.

Is this a bug? Well, not exactly although it's not ideal either. Intuitively, both of these conditionsal statements should evaluate to true, so it's a matter of having the response property return different values depending on whether it's being compared with a string or a number. As of yet, no other property works that way, and it would require some mucking around with the expression evaluator to do this properly. I'll certainly put it on my list of possible features for a future release.

-Sean

Hi Dave,

That's really kind of you!!We are really panicking now..

On the next site you can find our stimuli and scripts: http://www.megaupload.com/?d=ULZ0BP4D

The design of the task is as follows:

If you run the block 'sukeltjes' (this is a block in which we tried to program one branching trial, don't mind the other trials, because the design will be the same for them), you should see four doors; the participant has to choose one door by pressing q,s,k, OR l on a standard azerty keyboard. Depending on the chosen door, a certain reward is given (apples):

for door 1 = 4 apples won and 8 apples lost

for door 2 = 4 apples won and 50 lost

for door 3 = 2 apples won and 1 lost

for door 4 = 2 apples won and 10 lost

Feedback should be: the chosen door should be replaced by an open door showing the amount of apples lost and won (e.g. see picture 8r_4g.jpg), the total amount of apples gathered over trials (instead of the donkey), in the lower right corner: a bar showing visually the gains and losses (e.g. Bar13_87.jpg) on that particular trial with underneath the gains and losses on that particular trial in numbers (e.g. +4 and -8). For instance, if the participant gained a total of 6-19 apples over all trials, the bar 13_87 should be presented next to the fourth door. All feedback should be given at the same time during 2500ms.

Do you see the problem in the script?

I hope you can help us out, since we are really getting short in time.

Regards,

Kasia & Bram

I don't see any problem with your branch, but you might try removing the "if (true)" part, as in:

/ branch = [trial.HD_ID1_feedback]

This is logically equivalent to what you currently have.

-Sean