the stroop effect
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Andy Campbell10/10/13AP PsychPeriod 1
The Significance of the Stroop Effect
Our group will be exploring the Stroop effect and how it can affect reading
comprehension. The Stroop Effect, named after John Ridley Stroop, is a demonstration
of the reaction time of a task and is often used to show the difference between
automatic processing and conscious visual control. It was first published in 1935 along
with the results of an experiment in which participants had to identify the text color of the
name of a color. The results showed that most people had no trouble identifying the
color of words not relating to color, but difficulty identifying the color of the name of a
color (MacLeod 1-3).
When we look at the words in the test, we process the color and meaning of each
word. If both color and meaning are the same, we can respond rapidly to with the
correct answer. However, if there is a conflict between color and meaning, then the
stimuli are not compatible; we must make a decision and pay more attention to one
stimulus than the other one. Since human experience has taught us to value the
meaning of words more than the color they are written in, we naturally want to say the
meaning of the word instead of its color. When we are told to do the opposite of what
seems natural, we must consciously alter our answers. This leads to a much slower
reaction time. As this is a process one is usually unfamiliar with, it can be difficult.
The interference provides scientists with a measurable means to investigate how
the brain works. By manipulating the stimuli used for the test in various ways, you can
find out what types of thinking tasks interfere with other thinking tasks. Since seeing a
word, and putting the color you see into words, uses the same part of the brain the two
processes can interfere with each other. (Olson, "What Conflicting Mental Tasks Reveal
About Thinking.")
To explain why this occurs, there are a few well-supported theories. According to
the Rochester institute of Technology, one general finding is that the Stroop effect is
very robust. For example, the Stroop effect extends to color-related words like sky or
strawberry, though not as much. It is resistant to practice. The difficulty of removing the
interference effect of the Stroop task has led some researchers to claim that the brain
has evolved to recognize words without effort. This explanation is called the "automatic
word recognition hypothesis" and it is widely accepted. According to this theory, reading
is an automatic process, which cannot be switched off. So, people see the meaning of
words without much effort. On the other hand, naming colors is not automatic. It
requires more effort than reading, thus creating interference in the Stroop task.
Another theory, the "Speed of Processing" hypothesis, suggests that word
processing is much faster than color processing. Thus, in a situation of conflicting
stimuli between words and colors, when the task is to report the color, the word
information arrives at the decision process stage earlier than the color information and
results in processing confusion. On the other hand, when the task is to report the word,
because the color information lags behind the word information, a decision can be made
before the conflicting color information arrives. This theory is also widely-accepted,
though not as much as the first. The main question is whether the Stroop effect is
caused because of differences in speed of stimuli arriving in the brain, or because
evolution has taught humans to analyze the meaning of a word without consciousness.
Bibliography
"Background on the Stroop Effect." College of Liberal Arts. Rochester Institute of
Technology, n.d. Web. 10 Oct. 2013.
<http://www.rit.edu/cla/gssp400/sbackground.html>.
MacLeod, Colin M. "Half a Century of Research on the Stroop Effect: An Integrative
Review." Graz University. KARL-FRANZENS, n.d. Web. 10 Oct. 2013.
<http://www.uni-graz.at/dips/freudenthaler/unt/Stroop_MacLeod.pdf>.
Olson, Andrew, Ph.d. "What Conflicting Mental Tasks Reveal About Thinking." Science
Buddies. Rockspace Publishing, n.d. Web. 10 Oct. 2013.
<http://www.sciencebuddies.org/science-fair-projects/project_ideas/
HumBeh_p027.shtml#background>.