Does SRBOX/Microphone setup effect RTs?

[David Ruvolo]

Hello,

I have a question regarding using a microphone for measuring RT and audio 
input for a battery I am working on.

I am debating on whether using a audio splitter (a y cable) to send the 
signal to the SRBOX and the computer's recording device vs. using two 
microphones. If I choose to use two microphones, this creates extra 
environmental stimuli, would make positioning the microphones and testing 
the setup in the middle of data collection very time consumming (I am using 
non SRBOX tasks and SRBOX tasks that have a set order), this might create 
inconsistencies with data collection (each individual has a slightly 
different positioning, sound doesn't capture, etc), and the whole 
experience might be overwhelming for the participant. On the other hand, 
using the splitter would eliminate this issue, but I am not sure if there 
would result in differences in RT logged by E-Prime (this would be in ms 
and could make or break our outcomes). 

Does setup (using a splitter vs. two microphones) effect reaction time? I 
would be interested to know if anyone has looked into this, had any 
experience using either setup, or measured this.  Feel free to let me know 
or tell me I am overthinking this.

Thanks,

David

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