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

[Sean]

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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