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The missionaries and cannibals problem solving using mouse

Hi there

I want to measure the participants eye movements when solving the missionaries and cannibals task. They are required to move the missionaries and cannibals to the other side of a river using a boat and with some movement limitations.

I need help to design the task in the OpenSesame to ask the participants to move each of the scenario elements e.g., missionaries and cannibals using the mouse to the other side of river and vice versa.

Please could kindly advice what and how to do next?




  • Hi Masoud,

    You need to be more detailed in what exactly you want to have accomplished. Otherwise it is difficult to suggest a specific implementation to you.

    You could do the task in my different ways I suppose. The easiest solution that comes to mind, is using images as stimuli (for missionary, cannibal, and boat), and use mouse response together with ROI ( Not sure whether it suits your needs though.


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  • Dear Eduard,

    Many thanks for our kind advice.

    Please could you kindly have a look at the attached file? I want to have the time spent by participant (e.g. RTs and the number of moves to solve the problem) and the fixations, saccades and gazes toward the ROIs. I need OpenSesame to be synchronized with the eye tracker device.

    Please kindly can you help to know how to make it possible in OpenSeame to give the participants the possibility of moving objects on the screen by mouse? Please may also ask to know how to define the ROIs in the same screen then could have the eye tracker measures?



  • Hi @mfp49,

    You task is empty. I only see a single sketchpad with some pictures on it. I can't see any code or anything else.

    As @eduard suggested, you could use the mouse object and regions of interest to have the participats select two objects, then have a "crossing" label they could press to move things across. You'd have to do some programming to store in variables what is being selected, move pictures by chnging their coordinates, and use code too to store a time stamp at the beginning and another at the end in order to calculte the totsl time taken by subtracting the first from the second.

    I'd recommend looking up the mouse response and region of interest method And to invest some time in learning some Python in order to achieve the coding you need (especially how to set and change the values of variables). You'd probably have to work with nested loops in order to allow participants to keep moving things around until the trial is completed.

    Hope this helps,


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