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

[Sheila Bouten]

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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