vistalab / vistadisp

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Retinotopy stimuli - Lenght of 1 cycle #12

Closed marco-create closed 3 years ago

marco-create commented 4 years ago

Dear experts, I'm working with your retinotopy stimuli and I'm starting with some preliminary analysis. We use rotating wedge for polar angle definition and expanding ring for eccentricity. These are our parameters for fMRI study:

params.experiment      = 'rotating wedge (45deg duty)';
params.fixation        = 'double disk';
params.modality        = 'fMRI';
params.savestimparams  = 1;
params.repetitions     = ;
params.runPriority     = 2;
params.skipCycleFrames = 0;
params.prescanDuration = 0;%seconds
params.period          = 200;%seconds
params.numCycles       = 1;
params.motionSteps     = 8; % number of checkerboard positions per luminance cycle
params.tempFreq        = 2; % frequency of checkerboard flicker (Hz)
params.contrast        = 1; % checkerboard contrast
params.interleaves     = 2.5; % life time of each image
params.tr              = 2.5; % seconds
params.loadMatrix      = 'None';
params.saveMatrix      = 'wedge';
params.calibration     = 'None';
params.stimSize        = 'max';
params.countdown       = 0;
params.startScan       = 0;
params.trigger         = 'Scanner triggers computer';
params.triggerKey      = 's';
params.skipSyncTests   = true; % tell PTB to skip sync tests

Using these parameters we have 80 images, 1 after each 2.5 seconds. When it comes to know the length of 1 cycle, that is the duration (for this example: 200 sec) of the time needed to rotating wedge to start from point A and come back to point A or is length of 1 cycle referring to something else?

Thank you for your help, Marco