You have to stare at the black screen for 20 minues nonstop. During the test a white square with a small black square inside flashes on the black background. On some trials (some flashes) the small inner black square is nearer the top of the white square:
On other trials it will be near the bottom:
In the first case (first stimulus) you have to respond by pressing any key. If you fail you made a "comission" error. In the second case you have to respond by NOT pressing any key. If you fail you mad an "omission" error. The software records how many responses are right and wrong and your velocity of response. Half of the test you get mostly the square in the bottom and very few times the square in the top. So you have to press the key very few times. The other half you star to get mostly the square in the top, so you have to press the key very often.
The white flashes on top of the black background made me sort of sick. The white square would persist in my retina and would interfere with the following flash. I did a few errors, but I had to push myself hard to keep myself focused during 20 minutes looking at these anoying flushing squares.
I can certainly understand why my son has struggled with this test. It is boring, irritating, alienating and sickening.
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