Start a trial by pressing the space bar. A fixation dot will appear in the middle of the window. Stare at it.
A short time later (less than a second), a word (RED, GREEN, or BLUE) will appear on the screen, and the
word will be printed in either red, green, or blue font color. Your task is to classify, as quickly as possible,
the font color, regardless of the word name.
If the font color is red, press the h key; for green, press the j key; for blue, press the k key. It may take a
bit of practice to make certain you remember which key corresponds to which font color. You can
change which keys go with which color below.
After pressing a key to identify the font color, you will receive feedback on whether you were correct. If
you were incorrect, the trial will be repeated later in the experiment. If you find you are making lots of
mistakes, you should slow down, or make certain you understood which key goes with which font color.
What methods did we employ in this experiment?
On each trial you were shown a word (RED, GREEN, or BLUE) that was printed in
either red, green, or blue font color. Your task was to classify, as quickly as possible,
the font color, regardless of the word name.
The independent variable in this experiment was whether the word name and font color
were the same or different. The dependent variable was the reaction time between the
appearance of the stimulus and your response. Only trials in which you made the
correct classification were kept. If a trial was incorrect, it was repeated later in the
What do we predict participants will do? Why?
The Stroop effect is that people tend to be faster at identifying the font color when the
word name and font color are the same and are slower when they are different.
How robust is this effect? Are there limits to this effect?
Although not large in terms of absolute time, the Stroop effect is very robust. A common
explanation for the Stroop effect is that observers (especially college undergraduates)
have automatized the process of reading. Thus, the color names of the words are
always processed very quickly, regardless of the color of the ink. On the other hand,
identifying colors is not a task that observers have to report on very often, and, because
it is not automatized, it is slower. The fast, and automatic, processing of the color name
of the word interferes with the reporting of the ink color.
Data Table from experiment
Results for Brian Klarich on October 30, 2020 6:03:51 PM EDT
Data summary for experiment Stroop Effect.
Average reaction times (ms) for same or different word names and font colors. The
expected finding is that RT for name and font same will be smaller than RT for name
and font different.
Condition RT (ms)
Name and font same: 851.6667
Name and font different: 925.26666
On each trial, a color word (second column) was shown in a colored font (third column).
You identified the color of the font as quickly as possible, and the computer measured
the time needed to make the response (fourth column). If you made a mistake, the trial
was thrown out and repeated later in the experiment.
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