Radomize

[LIDIA ENCIDE]

Hi, I'm having trouble with the E-Prime 3 interface. My experiment involves rapid periodic visual stimulation. I would like the stimuli to be presented randomly every 167 ms within a list of stimuli. Basically, I have boats and human faces. I want the stimuli to be presented randomly, but in the following order: presentation of 4 boats followed by 1 face, and so on, always 4 random boats and 1 random face until the number of stimuli is complete. Could someone help me?

[Michiel Spape]

Hi,

This is a bit tricky to do, but it’s essentially like an oddball design – you’ll find many examples of it (for example, in Spapé, 2022, A Psychologist’s Guide to the EEG!). Essentially, you add two lists, Boats and Faces. Boats list has attribute Boat, containing the filenames of the pictures. Faces has attribute Face in similar manner. In your TrialList, make it have a TrialProc as procedure and add 5 attributes:

Pic1, Pic2, Pic3, Pic4, and Pic5. Add the following to the first row of this list:

[Boat:0] [Boat:1] Boat:2] [Boat:3] [Face:0]

 

Add in the TrialProc, make a single RSVP list, add 1 attribute (Pic) let it have 5 levels.

[Pic1]

[Pic2]

[Pic3]

[Pic4]

[Pic5]

 

Repeat, make sure you don’t repeat the stimulus (special option, on by default).

There’s a longer explanation available in my book, but hope this helps in the meantime!

Best,

Michiel

 

 

// Michiel Spapé, PhD

// Associate professor in cognitive neuroscience

// Institute of Collaborative Innovation

// Centre for Cognitive and Brain Sciences

// University of Macau

// N21 Office 1015c

// Avenida da Universidade

// Taipa, Macau SAR

 

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[LIDIA ENCIDE]

Thank you for responding Michiel. I think I managed to understand the logic for programming within the E-prime 3 interface, could you provide me with some images as an example?