camera recommendations?

Thu May 8 15:28:56 UTC 2014

Hi Rebecca,

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.

John Goodrich

On Wed, May 7, 2014 at 8:55 PM, Rebecca Lundwall <rebecca.lundwall at gmail.com
> wrote:

> 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.
>
> 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.
>
>
>
>
> On Wed, May 7, 2014 at 12:18 PM, John Goodrich <marcgoodrich5 at gmail.com>wrote:
>
>> Hi Rebecca,
>>
>> 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.
>>
>> Thanks,
>>
>> John Goodrich
>>
>>
>> On Friday, October 18, 2013 10:21:29 PM UTC-4, Rebecca Lundwall wrote:
>>>
>>>  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.
>>>
>>> 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.
>>>
>>> In the experiment:
>>> 1) E-Prime simultaneously sends an image to a monitor and starts the
>>> ForA timer (or it could start the camera's timer)
>>> 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.
>>> 3) the digital video with the time stamp are sent back for storage on
>>> the computer
>>> 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.
>>>
>>> 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:
>>>  *the camera must work in low-light conditions
>>> *there are approximately 50-60 trials for infants and 200 for children,
>>> each is presented for between 67 msec - 4 sec
>>> *I care about response differences as small as 10-20 msec (so am
>>> thinking about a camera with 60 fps or more)
>>> *is 60 Hz sufficient for the CPU?  If I get more fps on the camera do I
>>> need higher refresh rate as well?
>>>
>>> Thanks for your help.
>>>
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