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In this experiment, between 1 and 9 small white squares are
flashed briefly in a small area of the screen.
On each trial, your task is to observe and then respond
with how many you think were there. In the above image, you
would respond with the number 6. Use only the numbers at the
top of your keyboard. Speed is important, but accuracy is
more so. Try to think back and count how many there were if
you need to.
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There are two parts to this experiment. On each
trial in the first, a target (a triangle inscribed in a circle)
is briefly
flashed on one of 8 imaginary spokes extending
from the center of the screen (horizontal, vertical, and diagonal).
Using the number pad on your keyboard, your task is to observe
and press a key corresponding to the spoke the target was
on.
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In this experiment, a series of black
letters will be displayed on a gray background one after another
very quickly in the center of the screen. One of the letters
will be white. In each trial, you have two tasks. First, you
must notice and remember which letter was white. In some trials,
one of the letters displayed after the white letter
will be an 'X'. This is the only place an 'X' can ever occur.
Your second task is to notice whether or not an 'X' was presented.
At the end of the trial, you respond by pressing the key of
the white letter, and then by pressing either "Y"
(yes) or "N" (no) to indicate whether an 'X' was presented. |
