randomizing blocks independently of trials, and silent video

[Justin Lolofie]

I wonder if there is a nice and neat way to do this.  If not the ugly way
is to just put labels infront of your blocks, generate a random number,
then goto the matching label.


On Mon, 31 Mar 2003, James T. Myers wrote:

>
> I have a feeling there must be a simple way of doing this, but so far my
> assistants and I haven't figured it out.  How can we get E-Prime to take a
> set of blocks, each with its own set of trials, and randomize the order of
> the blocks without making the blocks all the same?  Maybe there's some
> default setting we're not turning off or something.
>
> By the way, the particular reason we want to do this right now is to play
> silent movies as primes in a sign language experiment.  We create each
> movie as a block of sequentially ordered trials, where each trial displays
> a BMP still picture.  If I remember right, we have it set up now so that
> we use every other frame from the original MPEG file and display it for 67
> msec, and it looks quite acceptable for our purposes.  This method would
> also seem to allow for collecting reaction times in the middle of a movie.
> I know others on this list have been interested in using movies as
> stimuli, and if silent movies will do, you could try this.
>
> But it all depends on being able to randomize the blocks....
>
> James Myers
> Graduate Institute of Linguistics
> National Chung Cheng University
> Min-Hsiung, Chia-Yi  621
> TAIWAN, ROC
> Email:  lngmyers at ccunix.ccu.edu.tw
> Web:    http://www.ccunix.ccu.edu.tw/~lngmyers/
> Phone:  886-5-242-8251
> Fax:    886-5-272-1654
>
>