Preferential looking paradigm -- Have E-Prime start webcam recording at beginning of experiment

[John Goodrich]

Hi David,

Thanks for the quick reply. I had not thought of that before, but it could
solve the problem if there is not another solution. The only issue is
testing will take place with kids in schools, so I am not sure if the
testing area will allow for a mirror to be set up behind the participant. I
currently am working with someone to write some .dll scripts that hopefully
can send a message from E-Prime to the webcam, but if that does not work
the mirror solution is a definite possibility.

John Goodrich


On Thu, May 8, 2014 at 11:24 AM, David McFarlane <mcfarla9 at msu.edu> wrote:

> John,
>
> Not answering the question you asked, but just tossing out another thought
> -- in addition to capturing sounds from the microphone to act as time
> markers in the recorded video, what if you put a mirror behind the subject
> somewhere so that the recorded video would also include whatever happens on
> the computer display?
>
> -- David McFarlane
>
>
>
> At 5/7/2014 02:13 PM Wednesday, John Goodrich wrote:
>
>> I am developing a preferential looking paradigm to investigate semantic
>> priming effects using E-Prime. The setup is a dual monitor setup with a
>> Logitech webcam attached between the two monitors to track where the
>> participant is looking. Does anyone know of a method to have E-Prime start
>> the webcam recording when the experiment starts? The webcam is hooked into
>> a docking station via a USB port. Being able to start the webcam at the
>> exact same time as the experiment would make the process of coding the
>> video much easier. Otherwise, I will have to listen for onset of the audio
>> files played by E-Prime in the video and begin coding at a certain duration
>> after the audio began, when the images were set to appear.
>>
>> Thanks,
>>
>> John Goodrich
>>
>
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