#PSYSCOPE BLOCK RANDOMIZING HOW TO#
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It's a good question Eric and, yes, I think it should be possibleĭepending critically on what differs between the blocks.

#PSYSCOPE BLOCK RANDOMIZING HOW TO#

I'm not a real Python programmer either but using the Builder view gives a very good insight into how to learn to write in it just well enough to get things done.

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Hope that helps (but bear in mind this is all just code typed into e-mail and I have no idea if it will actually work). # so that it also gets repeated for each loop. # Make sure that the subsequent code which runs each of the trials is also indented we are now loading a variable file name four times rather than a hard-coded one just once. TrialList=data.importTrialList(fileName)) TrialList=data.importTrialList(u'././././Users/michael/parameters.csv')) Trials=data.TrialHandler(nReps=5.0, method=u'random', extraInfo=expInfo, #set up handler to look after randomisation of trials etc # then find the lines that looks something like these: Random.shuffle(blockList) # reorder them each time create a list of four filenames containing your block information:īlockList = The only Python coding you'll need to do is replace that with a loop so that it runs multiple times, each time loading another (randomly ordered) file.

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It will have done all the mechanical aspects of creating the experiment for you (Jon has done a great job of this: the code is even nicely commented for you.) This is what we often do in our lab: use the Builder to do the 90% monkey work and then switch to the coder view to add the finer level of control that might be needed.įind the line where the csv file is loaded which contains your trial data for the block. What you could do is use the Builder to set up the study as if there was just one block.

I don't use the Builder view much, but although it allows one to randomise the order of trials WITHIN a block, I can't find an obvious way of randomising the blocks themselves.

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One can do that within the Coder view of course, because you have full Python flexibility to do whatever you want. if you change the background colour, you don’t need to change the code).Good question. You might also want to consider changing the visibility of the stimulus directly, by controlling its opacity value. Make sure the code component is above the text component, so the latter always receives the latest value for the colour variable

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Then in your text stimulus component, simply put $current_instruct_colour in its “Color” field, set to update on every repeat. ThisExp.addData('instruction_colour', current_instruct_colour) If block_type = 'mixed': # randomised orderĬurrent_instruct_colour = instruct_colours.pop() Instruct_colours = * 8 + * 8 # fixed (reverse) order This ensures that you don’t get the unbalanced mix of conditions you’re currently finding. Note that instead of randomly sampling a value on each trial, we create a balanced list of conditions and then randomly shuffle if required. Then in your routine, insert a code component and put in something like the code below in the “begin routine” tab. The outer loop is set to be “sequential” and is connected to a conditions file that simply looks like this: block_type An inner loop to run your trials and an outer loop to run your blocks. I was going to put a loop around the current routines I was going to put a loop around the current routines as this would also solve my issue about how to show the correct feedback, but my issue there is that the new loop will contain instructions that I don’t want to be included. you could have 10 of one and 6 of another. This works but the number of trials is not equal, e.g. What specifically went wrong when you tried that?: I used the coin flip function to change the colour of the stimulus that instructs the participant to make a response or not: coinflip=np.random.randint(3, size=1) I want to then run a mixed block where the 16 practice trials are presented in a random order. In my stop signal task participants complete 16 practice trials, one block of 8 trials in which they make a response, and then one block of 8 trials where they withhold their response.

Psyscope block randomizing