Why do you use two separate systems? (Hope I understand your setup) <br><br>E-Prime should be able to collect the start/stop responses as well. But if that is not an option, I would use EPrime on both computers and synchronize them both with the trigger pulse of the scanner. However, you must be very careful when syncing two separate devices if you only use a single sync event at the start of the experiment. This will only work reliable when both internal clocks run exactly at the same speed. A possible workaround for this is to record repeating trigger pulses of the scanner (i.e. a trigger at each EPI onset) and correct for differences offline. Another, method would be to use a digital link between both computers and let the experiment script send event markers at specific times. The receiving computer should record those events along with the start/stop responses. <br>
<br>best<br>paul<br><br><div class="gmail_quote">2012/9/28 Mukesh Vaidya <span dir="ltr"><<a href="mailto:vaidyamukesh5@gmail.com" target="_blank">vaidyamukesh5@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
No response..??<div><br><br>On Thursday, 27 September 2012 15:36:27 UTC+5:30, Mukesh Vaidya wrote:<blockquote class="gmail_quote" style="margin:0;margin-left:0.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi All,<div>
<br></div><div><br></div><div><pre style><font color="#800000">> We need to extract Reaction Time data [usually in milliseconds] from our</font>
participants' in-scanner experiment data.
<font color="#800000">> The E-Prime data files [e-dat files] are generated by a separate system</font>
which runs the experiment script [or "paradigm"], and the participant's
vocal responses are recorded using a separate computer.
<font color="#800000">> The vocal responses are recorded by manual 'start' and 'stop' button</font>
presses, whereas the e-dat files are generated automatically by the
computer that is running the experiment, and it is synchronized with the
MRI scanner.
<font color="#800000">> If we can figure out what auditory signal, i.e., sound feature that is</font>
part of the sound file is synchronized perfectly with any specific
time-stamp in the e-dat files, we can then use that time-stamp as our
"zero" point, and measure Reaction Time accordingly.</pre><pre style><br></pre><pre style>I am attaching experiment file as well.</pre></div></blockquote></div><span class="HOEnZb"><font color="#888888">
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