Recording the response time for two correct answers in the same trial

[David McFarlane]

Once again, I think you could work out an answer based on the 
"Multiple Response Collection" example that you may download from the 
PST website.  You might enhance that by using two keyboard input 
masks on your stimulus object in order to help keep track of which 
responses come from which subject.

-----
David McFarlane
E-Prime training 
online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter:  @EPrimeMaster (https://twitter.com/EPrimeMaster)

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At 9/12/2013 02:42 PM Thursday, Sheila Bouten wrote:
>I have a related question: I have two participants in my experiment 
>using one keyboard to respond to a memory task. For example, if they 
>are shown an image they have seen before, the participant on the 
>left would press "Q" while the participant on the right would press 
>"N". If they hadn't seen the image before, the participant on the 
>left would press "W" while the participant on the right would press 
>"M". My problem is that my code makes it such that if one 
>participant accidentally presses one key twice, their response is 
>recorded twice and the other participant's response is not recorded. 
>This data is thrown out. Is there some code to prevent this by 
>recording only one keystroke from each half of the keyboard?
>
>Thanks for your help!
>
>On Tuesday, July 24, 2012 3:56:05 PM UTC-4, Sean wrote:
>Hi, I am in the process of creating an experiment that assesses 
>sustained attention. One of my variables is whether the participant 
>is taking the test alone or with another individual. Everything 
>works smoothly in the alone condition, but it gest tricky when I 
>have two people taking the test.
>
>The way the test is set up: There are 300 trials in random order 
>that each contain a string of six digits. The participants' task is 
>to respond correctly and as quickly as possible for each trial. If 
>there is the number 4 in the sequence of numbers, they are asked to 
>respond by pressing 1, and if the 4 is absent they are asked to 
>press 2. Then the screen goes blank for about a half of a second and 
>then shows the next sequence of numbers.
>
>Now I know that the response time is recorded for the individual 
>responding with the 1 and 2, but I need to also be able to record 
>the response time (and correctness) of another participant taking 
>the same test on the same screen using the same keyboard. I got the 
>program to accept 2 responses before moving on to the next sequence, 
>but it only records the first response. For the second participant I 
>asked that they use the keys Z and X the same way I explained for 1 
>and 2 (Z if there is a 4, X if there is not a 4).
>
>Is there a way that the program can log the response time and 
>accuracy of both participants taking the test together? In other 
>words, if one participants presses 1 and the other participant 
>presses Z, how can I get the response time for both of the responses?
>
>Thanks in advance for any help

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