<div dir="ltr"><div>Hi Rebecca, <br><br>Thank you for the quick reply. I currently am working with an E-Prime expert to solve this situation, but if we cannot come up with a solution I may have to purchase a camcorder and time stamp device. I will let you know if this is the case.<br>
<br></div>John Goodrich<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, May 7, 2014 at 8:55 PM, Rebecca Lundwall <span dir="ltr"><<a href="mailto:rebecca.lundwall@gmail.com" target="_blank">rebecca.lundwall@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Yes, EPrime support helped me, but it took a lot of back and forth. We ended up switching back to a parallel port device that I got from Horita in order to inject a time stamp on the video capture, doing video capture on a 2nd CPU etc. We did not go with low light as that apparently interferes with frame rate capture. 60 Hz seems to be working fine. <div>
<br></div><div>I don't know how to do time stamp with a webcam and would be linked to the presentation of each new stimulus. If you are thinking of buying a camcorder and a time stamp device then I will let you know further details.<br>
<div><br></div><div><br></div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote"><div class="">On Wed, May 7, 2014 at 12:18 PM, John Goodrich <span dir="ltr"><<a href="mailto:marcgoodrich5@gmail.com" target="_blank">marcgoodrich5@gmail.com</a>></span> wrote:<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class=""><div dir="ltr">Hi Rebecca,<br><br>I see that no one ever responded to your post, but did you ever figure out a solution to this problem? I am designing a preferential looking task that seems similar to the task you described, only I am using a webcam to record the eye movements. I would like to be able to have E-Prime tell the webcam to start recording when the experiment begins so that the onset times of objects in the E-Prime output can be directly used to identify when in the video the two images appear to let me know when to begin coding eye movements. <br>
<br>Thanks,<br><br>John Goodrich<div><div><br><br>On Friday, October 18, 2013 10:21:29 PM UTC-4, Rebecca Lundwall wrote:<blockquote class="gmail_quote" style="margin:0;margin-left:0.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><font color="#000000" face="Times New Roman" size="3">
</font><p style="margin:11.25pt 0in;line-height:16.5pt"><span style="color:rgb(43,46,47);font-family:"Lucida Sans Unicode","sans-serif";font-size:10.5pt">I am trying to get a new research lab set up. I use EPrime to present stimuli and a camera to collect eye movement data. I am working with the
college's computer services and they asked me to contact this group and see if you had
recommendations on *camera specs* for the following situation. PSTNET support also suggested that I ask this question here. I do not use
eye-tracking equipment because it does not work well with young infants. </span></p><font color="#000000" face="Times New Roman" size="3">
</font><p style="margin:11.25pt 0in;line-height:16.5pt"><span style="color:rgb(43,46,47);font-family:"Lucida Sans Unicode","sans-serif";font-size:10.5pt">My question is if anyone knows of a camera or camera set-up that would work without the ForA timer. My key concern is having a time-stamp on the video and that the
time-stamp is controlled (started and stopped) by EPrime presenting the
stimulus. I will describe how we have done this in the past,
but I can no longer find a supported For-A video timer VTG-33 (which reports frames) and we are
nervous about buying the one I found on Ebay. </span></p><font color="#000000" face="Times New Roman" size="3">
</font><p style="margin:11.25pt 0in;line-height:16.5pt"><span style="color:rgb(43,46,47);font-family:"Lucida Sans Unicode","sans-serif";font-size:10.5pt">In the experiment:<br>
1) E-Prime simultaneously sends an image to a monitor and starts the ForA timer
(or it could start the camera's timer)<br>
2) The ForA timer (if used) puts a time stamp on the digital video recording. The timestamp starts and runs until EPrime tells it to stop. Stopping the clock is important so that trials are separated and RAs don't get confused when they go back and code for eye movement latency and direction (left or right). If I used
the camera's internal clock, EPrime would need to start and stop it's clock or
start and stop the entire camera.<br>
3) the digital video with the time stamp are sent back for storage on the
computer<br>
4) the digital files are opened with a video editing software) that can detect scenes based on lighting conditions (the presentation of a new stimulus
triggers a new scene); we number the scenes and two RAs code them for eye
movement latency and direction. </span></p><font color="#000000" face="Times New Roman" size="3">
</font><p style="margin:11.25pt 0in;line-height:16.5pt"><span style="color:rgb(43,46,47);font-family:"Lucida Sans Unicode","sans-serif";font-size:10.5pt">So, does anyone know of a camera that has a timestamp down to the frame level and that can be synced with the presentation of a stimuli by EPrime? Other info or related questions: </span></p>
<div><font color="#000000" face="Times New Roman" size="3">
</font><span style="color:rgb(43,46,47);font-family:"Lucida Sans Unicode","sans-serif";font-size:10.5pt">*the
camera must work in low-light conditions<br>
*there are approximately 50-60 trials for infants and 200 for children, each is
presented for between 67 msec - 4 sec <br>
*I care about response differences as small as 10-20 msec (so am thinking about
a camera with 60 fps or more)<br>
*is 60 Hz sufficient for the CPU? If I get more fps on the camera do I need higher refresh rate as well?</span></div><div><span style="color:rgb(43,46,47);font-family:"Lucida Sans Unicode","sans-serif";font-size:10.5pt"></span> </div>
<div><span style="color:rgb(43,46,47);font-family:"Lucida Sans Unicode","sans-serif";font-size:10.5pt">Thanks for your help.</span></div></div></blockquote></div></div></div></div><div><div>
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