Visual Detection Experiment
Jaap MurreImages are shown at increasingly long intervals until the subject can recognize it. The detection threshold (in frames of 16.6 ms) and description are recorded for each image.
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preload("image1.jpg");
preload("image2.jpg");
preload("mask.jpg");
image.await("preloading_completed");
var i;
text("Press the spacebar as soon as you recognize the image. It will be presented longer and longer.");
await(4000);
text("");
await(1000);
waitfor {
for (i = 1; i < 20; i++) {
setimage("image1.jpg");
await(16.66 * i);
setimage("mask.jpg");
await(500);
clear();
await(1500);
}
} or {
awaitkey(" ");
log(i,"treshold1");
}
input("What did you see?","answer1");
text("");
await(1000);
text("Now we will repeat the procedure with a different image");
await(3000);
text("Again: Press the spacebar as soon as you recognize the image.");
await(4000);
text("");
await(1000);
waitfor {
for (i = 1; i < 20; i++) {
setimage("image2.jpg");
await(16.66 * i);
setimage("mask.jpg");
await(500);
clear();
await(1500);
}
} or {
awaitkey(" ");
log(i,"treshold2");
}
input("What did you see?","answer2");
text("");
await(1000);
text("Thank you for participating!");
await(3000);
You can download the files as follows: Click on the file (link) and then right-click and choose Save as... from the menu. Some media files (e.g., sound) will have a download button for this purpose.
image1.jpg
image2.jpg
mask.jpg