OS (e.g. Win10): Win10
PsychoPy version (e.g. 1.84.x): 1.85.2
I have a problem regarding keyboard responses and following are what I’m trying to do and what the problem is.
1.What I am trying to do
I made self-paced reading task; a task where participants read sentences by pressing ‘space bar’ and revealing the words of the sentence one by one from the first word appearing at the left. Before any word is revealed, all words are masked by dashes. (check the gif below)
After reading and comprehending the whole sentence properly, the participant must answer a comprehension question(or a ‘probe’ question). It simply shows certain part of the previous sentence in a form of shorter sentence. Participants will decide whether the probe sentence is true of false by pressing the ‘j’ or ‘f’. After a response, there will appear a cross symbol(‘break_2’) at the center of the screen and soon, next sentence will appear masked.
The screenshot below shows basic layout of the routines I just mentioned.
The code component of the routine ‘trial’ is shown below. The original code is from this post and I modified it to work as I intended.
There are codes in the Begin Routine tab and Each Frame tab only.
At Begin Routine:
sentenceList = sentence.split() # this breaks your sentence's single string of characters into a list of individual # words, e.g. 'The quick brown fox.' becomes ['The', 'quick', 'brown', 'fox.'] # keep track of which word we are up to: wordNumber = -1 # -1 as we haven't started yet # now define a function which we can use here and later on to replace letters with '-': def replaceWithdash(textList, currentWordNumber): dashSentence = '' for index, word in enumerate(textList): # cycle through the words and their index numbers if index != currentWordNumber: dashSentence = dashSentence + '--' * len(word) + '--' # add a string of dash characters elif wordNumber==5: dashSentence = dashSentence + ' ' + word + '.'# the last word will appear with a period else: dashSentence = dashSentence + ' ' + word + ' ' # except for the current word return dashSentence # yields the manipulated sentence # now at the very beginning of the trial, we need to run this function for the # first time. As the current word number is -1, it should make all words '-'. # Use the actual name of your Builder text component here: text.text = replaceWithdash(sentenceList, wordNumber) # In the Builder interface, specify a "constant" value for the text content, e.g. # 'test', so it doesn't conflict with our code.
At Each Frame
keypresses = event.getKeys() # returns a list of keypresses if len(keypresses) > 0: # at least one key was pushed if 'space' in keypresses: thisResponseTime = t # the current time in the trial wordNumber = wordNumber + 1 if wordNumber == 6: thisExp.addData('word' + str(wordNumber), thisResponseTime - timeOfLastResponse) timeOfLastResponse = thisResponseTime continueRoutine = False elif wordNumber < len(sentenceList) + 1: if wordNumber == 0: # need to initialise a variable: timeOfLastResponse = 0 # save the inter response interval for this keypress, # in variables called word0, word1, etc: thisExp.addData('word' + str(wordNumber), thisResponseTime - timeOfLastResponse) timeOfLastResponse = thisResponseTime # update the text by masking all but the current word text.text = replaceWithdash(sentenceList, wordNumber) elif 'escape' in keypresses: core.quit() # I think you'll need to handle quitting manually now.
2. The Problem
It is perfect. However, if the participant unintentionally presses ‘space’ at the ‘probe’ routine(which is separated from ‘trial’ routine and contains no code component), this somehow triggers the first word of the sentence from next trial repeat to be revealed even before the participant press ‘space’ again. In other words, the stage where the whole sentence is masked with dashes disappears if participant press ‘space’ in the previous loop of the ‘probe’ routine.
I examined the cause of the problem and tried to fix it in terms of code component of the builder view but I failed. The main cause is with the variable called ‘wordNumber’. If you see the code, at the Begin Routine stage, the wordNumber is set to -1. If the wordNumber is -1, the first appearance of the sentence is fully covered by dashes. And after the participant presses the very first ‘space’, wordNumber becomes 0 by the code at the Each Frame. And as the ‘space’ input continues, wordNumber escalates upto 6 to reveal the last word, store the RT of that ‘space’ and finish the routine.
As far as I understand, if the ‘trials’ routine is over, the keyboard component of that routine must halt too. But somehow it doesn’t and it is active until the next repeat of the whole loop starts. I tried really really (about 30 hrs) a lot to fix this but it just doesn’t seem easy. The point is, wordNumber should be -1 again after the sentence was fully revealed and it should not change until the next fully masked sentence appears. But pressing ‘space’ still works even after the ‘trials’ routine has ended eventhough I did not state ‘space’ in the ‘probe’ routine.
The list of the keys in the keyboard component of the routine ‘probe’ only states two keys ‘f’ and ‘j’.
I also attached two keyboard component properties, one from ‘trial’ routine and one from ‘probe’ routine.
If there are any other information I can provide, please tell me so. I didn’t attach the psyexp file because it contains settings for Korean and it might not work in most of the readers’ environment.
Thank you for reading this long post.