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</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. <?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></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. <o:p></o:p></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. <o:p></o:p></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: <o:p></o:p></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; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;'>*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; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;'></span> </div><div><span style='color: rgb(43, 46, 47); font-family: "Lucida Sans Unicode","sans-serif"; font-size: 10.5pt; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;'>Thanks for your help.</span></div></div>
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