Corsi Blocks (Simplified) Demo Experiment Run Experiment

Corsi Blocks (Simplified)

Jaap Murre

Functional Corsi Block Tap test with immediate feedback. Does not store any data. Useful for demonstrations or informal testing.

This is the long text for the Corsi Block Tap test.

Functional Corsi Block Tap test with immediate feedback. Does not store any data. Useful for demonstrations or informal testing.

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var coords = [[10,10],[20,40],[20,80],[40,30],[45,60], // block coordinates
          [60,10],[60,75],[70,50],[80,20],[85,45]],    // [[left,top], ...]
    blocks = [], i, b, series, e, block,
    block_color = "lightgrey",
    span = 2, errors, attempts = 0, correct = 0, kessels_score;
    
instruction("Watch the blocks 'light up' and then click them in the correct order. ");
clear();
await(1500);
    
for (i = 0; i < coords.length; i++) // Create block layout, use `i` as id
{
    blocks.push(main.addblock(coords[i][0],coords[i][1],10,10,block_color,"",i));
}

while (true)   // Do 'forever', but really only until `break` is called
{
    await(2000);
    series = shuffle(range(10));            // Randomize series
    
    for (i = 0; i < span; i++)              // 'Play' series
    {
        b = series[i];
        blocks[b].style("backgroundColor","black");
        await(500);
        blocks[b].style("backgroundColor",block_color);
        await(500);
    }
    
    errors = 0;
    for (i = 0; i < span; i++)              // Have subject click series
    {
        e = await("click");                 // Event `e` also contains target node
        b = parseInt(e.event.target.id);    // parseInt turns a string into a number
        blocks[b].blink("black",250);       // 250 ms blink to black
        if (series[i] !== b)                // Count errors
        {
            ++errors;
        }
    }   
    
    ++attempts;
    if (errors === 0)
    {
        ++correct;
        if (attempts === 2)             // If twice correct, increase span
        {
            ++span;
            attempts = 0;
        }
    }
    else
    {
        if (attempts === 2)             // If twice wrong, stop test
        {
            --span;
            kessels_score =  span*correct; // Kessels et al. (2000)
            break;                      // Break out of while loop
        }
    }
} 

await(1000);
main.addblock("center","center",90,90,"white","Your Corsi blocks span is " + span);

console.log("Corsi Span: ",span,"  Kessels Score: ",kessels_score);
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