main.setfontsize(70)

radio("Participation in this experiment is entirely voluntary and you may withdraw at any time. Would you like to proceed?",
['yes', 'no'],"consent");


// SURVEY QUESTIONS 

// very few studies have been able to detect the relationship between multilingualism and selective attention in young adults.
// therefore, recruit young adults as our sample.
select("Please indicate your age here.",
[18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40],"age");

// having to switch between more languages -> better selective attention.
// thus, better able to detect both interpretations of ambiguous figure. 
radio("How many languages do you use on a daily basis to communicate with others?",
[1,2,3,4,5],'multilingual');


// ACTUAL EXPERIMENT

instruction("In this experiment, a series of images will be presented on the screen.
"
    + "Some of those images are ambiguous, meaning they can be interpreted in more than one way.
"
    + "On the next page, an example of such an image will be presented.
", "Continue");

preload("ambiguous_vase.jpg");
image.await("preloading_completed");
preload_range("ambiguous_fig{0}.jpg", 1, 7);
preload_range("fig{0}.jpg", 1, 4);
image.await("preloading_completed");

var headerblock = addblock("center",3,90,15),
    centerblock = addblock("center",20,90,30),
    figs = ['ambiguous_fig1.jpg','fig1.jpg','ambiguous_fig2.jpg','ambiguous_fig3.jpg','fig2.jpg','ambiguous_fig4.jpg','fig3.jpg','ambiguous_fig5.jpg','ambiguous_fig6.jpg'];
    i;

headerblock.text("Here you see an ambiguous figure, which can be interpreted as either a vase or two people facing each other. Click anywhere on the screen to continue.",80);
centerblock.setimage("ambiguous_vase.jpg");
await('click');

// destroying the previously set blocks for the boxes coming up next
headerblock.destroy(); 
centerblock.destroy(); 

instruction("You will now be presented with 9 images.
"
    + "Some of them are ambiguous, whereas others are only interpretable in one way.
"
    + "Each image will be presented for 4 seconds, after which you are asked to describe what you have seen.
"
    + "Click continue to start the experiment.
", "Continue");


for(i = 0; i < figs.length; ++i )
{
   var centerblock =  main.addblock("center","center",25,25);
   
   centerblock.setimage(figs[i]);
   await(4000);
   clear();
   main.removeblock(centerblock);
    
   largeinput("Try to describe what the figure depicted in as few words as possible.
"
   + "If you think it was an ambiguous figure, you can describe both your interpretations separated by a comma.", "description")
    
}

text("You have reached the end of the experiment :)
"
+ "We conducted this experiment to measure the relationship between multilingualism and selective attention,
"
+ "which is the ability to focus ones attention on relevant stimuli in the presence of distractors.
"
+ "Click to continue.");
await('click');

text("In this specific context, that would mean that multilinguals perform better on the previous task,
"
+ "because of a greater ability to focus on one interpretation of the ambiguous figure
"
+ "without letting the alternative interpretation interfere, and vice versa.
"
+ "Click to continue.");
await('click'); 

text("Thank you for your participation!");
await(2000);
clear();

Data inspection is forthcoming!

In the mean time, authors may download their own data and make it available as an Excel file. Check out the 'Stimuli and Files' tab.