running time

[Jessica Peter]

Hi,

my lab would like to use the MST for a baseline measurement of hippocampal activity and later on define an individual ROI of HC activation for the main study part.

At the moment, the continuous PsychoPy script allows us to choose between the AllShort_Set1 (190 trials) and AllShort_Set2 (200 trials) limiting the running time of the MST task to about 8 minutes. We would like to let fMRI run for about 15 minutes.

 

So our questions would be:

Question 1: Running the current script twice would give us 16 minutes: Do you have a recommendation on how to efficiently achieve that length of scanning time using the continuous PsychoPy Script?

Question 2: You included a Matlab-Script called CreateOrderLagBins_0_180.m. Is it possible to create a longer lag list with this script that can be implemented in the continuous PsychoPy script and thus prolong the running time of the task?

Any help would be highly appreciated.

Thank you and all the best,

Jessica

[Craig E.L. Stark]

First, you could certainly do two runs, pausing the scanner between them. This is a very common setup. Just use a different stimulus set for each run. 

Second, you can always modify that Matlab code or the Python code another user made to create whatever mix you like. My guess though is that to have a good long run, you’d use multiple sets anyway. Just sit down and sketch out how many stimuli of each type you’d like for your fMRI analyses. 

Craig

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