Text display while a video is running

[David Vinson]

Just a small follow-up to David McFarlane's detailed reply:

Having tried out (but not actually conducted) a design functionally 
similar to what you are trying to do, one thing to be careful about is 
making sure that whatever method you use, it doesn't miss out on 
detecting any responses during the sequence of events.  for example if a 
Wait object is used to collect responses & is followed by a Text object 
displaying feedback each time, you need to allow for the possibility 
that a key may be pressed during the Text object as well.  You may not 
want to display (the same) feedback yet again in such cases but you 
probably want to record the RT.   My feeling is that the multiple 
response method David describes may be less clunky in this regard.

good luck,
David V.

On 03/12/2013 19:11, David McFarlane wrote:
> To answer the question as posed, yes, there should be a way that one 
> can initiate a Text display without ending the video.  Would you also 
> like to know how?  A lot of details involved, but here are just a few 
> broad thoughts to get you started...
>
> For your Movie object, set Stop After to No, and Duration to 0. Now 
> the movie will continue to play while your program goes on to run 
> other things.  In particular, it can move on to process responses and 
> present feedback.  As for that aspect...
>
> I would probably use some inline code to run a loop for the response 
> feedback.  E.g., follow the Movie object with a Wait object that waits 
> for a response, then after that a Text object to present feedback 
> (making sure that it does not overlap the movie), and then an inline 
> that logs the RTTime of the Wait response and loops back to the Wait 
> if the Movie is not done yet.  You could then derive RTs by comparison 
> of the Wait RTTimes to the Movie OnsetTime.
>
> Alternatively (and likely the way I would do it), set up the input 
> mask for the Movie to collect multiple responses, and then make use of 
> that facility as shown in the Multiple Response Collection example on 
> the PST web site.  Use inline code right after the Movie to detect any 
> new response to the Movie.  Then present your Text feedback, and more 
> inline to loop back to the response detection inline.  At the end of 
> the Procedure, after the response loop, more inline code to log all 
> the responses to the Movie, as shown how in the Multiple Response 
> Collection example.
>
> As you can see, this project may require a variety of advanced skills, 
> so you have your work cut out for you.
>
> -----
> David McFarlane
> E-Prime training online: 
> http://psychology.msu.edu/Workshops_Courses/eprime.aspx
> Twitter:  @EPrimeMaster (https://twitter.com/EPrimeMaster )
>
> /----
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>
> At 12/3/2013 01:32 PM Tuesday, Wojciech Kaczkowski wrote:
>> I'm currently designing an experiment in EPrime 2.0 where 
>> participants are watching a video depicting a fight between two 
>> people. The participants are instructed to indicate whether they find 
>> a particular behavior aggressive by pressing a space bar. They can 
>> make their responses multiple times and at any time while the video 
>> is playing. There is no correct or incorrect response.
>>
>> The thing that I'm having a problem with is that I want a small text 
>> display to come on the screen whenever the participant presses a 
>> space bar. The text would say something like "Your response has been 
>> registered" so that the participant knows that his response was 
>> recorded. However, I do not want for the text display to have any 
>> effect on the video - it should keep going no matter when the 
>> participant makes the response. Basically, I'm trying to set up a 
>> text display while the movie clip is running. The participant's 
>> response would initiate the text display, but not terminate the video.
>>
>> Does anyone have any suggestions on how to go about setting up this 
>> experiment? So far, the only possible actions allowable for a 
>> response are either to terminate a video, jump to a label, or no 
>> action. Is there a way that one can initiate a text display without 
>> ending the video?
>

-- 
David Vinson, Ph.D.
ESRC Research Fellow
Cognitive, Perceptual and Brain Sciences Research Department
University College London
26 Bedford Way, London WC1H 0AP
Tel +44 (0)20 7679 5311  (UCL internal ext. 25311)


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