Phonotactic Probability of Brand Names: I’d that!
Michael S. Vitevitch and Alexander J. Donoso
Department of Psychology University of Kansas
Abstract
Psycholinguistic research shows that word-characteristics influence the speed and accuracy of
various language-related processes. Analogous characteristics of brand names influence the
retrieval of product information and the perception of risks associated with that product. In the
present experiment we examined how phonotactic probability—the frequency with which
phonological segments and sequences of segments appear in a word—might influence consumer
behavior. Participants rated brand names that varied in phonotactic probability on the likelihood
that they would the product. Participants indicated that they were more likely to purchase a
product if the brand name was comprised of common segments and sequences of segments rather
than less common segments and sequences of segments. This result suggests that word-
characteristics may influence higher-level cognitive processes, in addition to language-related
processes. Furthermore, the benefits of using objective measures of word characteristics in the
design of brand names are discussed.
In the branch of Psychology known as Psycholinguistics, researchers examine various
characteristics of words in an effort to understand how those characteristics influence
language-related processes, including the ability to quickly and accurately acquire, produce,
recognize, and remember the words of one’s language. Among the characteristics of words
that Psycholinguists have examined are the frequency with which the word occurs in the
language (Soloman & Postman, 1952), the age at which that word was first learned (known
as age-of-acquisition, AoA; Ellis & Morrison, 1998), phonotactic probability (i.e., the
frequency with which phonological segments and sequences of segments appear in a word;
Vitevitch & Luce, 1998), and neighborhood density (i.e., the number of words that sound
like that word; Luce & Pisoni, 1998).
It has been known for some time that words that occur frequently in the language are
recognized and produced more quickly and accurately than words that occur less frequently
in the language (e.g., Soloman & Postman, 1952; Oldfield & Wingfield, 1965). In contrast,
other characteristics, such as neighborhood density have been shown to have different
influences in different cognitive processes, such as word-learning (Storkel, 2004), word
production (Vitevitch, 2002), word recognition (Luce & Pisoni, 1998), and verbal short-term
memory (Roodenrys et al., 2002). It is therefore important to examine the influence of
various word-characteristics in a variety of cognitive processes and domains.
In addition to influencing basic cognitive processes (e.g., learning, production, recognition,
and short-term memory), recent findings suggest that these and other word-characteristics
may also influence processing of language-related information in applied domains (e.g.,
Hennessey, Bell, & Kwortnik, 2005). Consider, for example, the work by Lambert and
colleagues examining how neighborhood density influences the number and types of errors
made by physicians, nurses, pharmacists, and patients when identifying drug-names
Correspondence should be addressed to: Michael S. Vitevitch, Ph.D. Spoken Language Laboratory Department of Psychology 1415
Jayhawk Blvd. University of Kansas Lawrence, KS 66045 [email protected]: 785-864-9312.
NIH Public Access
Author Manuscript
Psychol Res. Author manuscript; available in PMC 2013 November 01.
Published in final edited form as:
Psychol Res. 2012 November ; 76(6): 693–698. doi:10.1007/s00426-011-0374-z.
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(Lambert et al., 2010). In these studies, neighborhood density was defined as the number of
drug-names (rather than words in the language) that sounded like a given drug-name. As in
the case of real English words (Luce & Pisoni, 1998; see Vitevitch & Rodriguez, 2005 for
different effects in Spanish), drug names that sounded like many other drug names were
more likely to be misidentified than drug names that sounded like few other drug names.
Identifying how word-characteristics such as neighborhood density influence prescription
errors not only has practical implications for reducing those errors (Lambert, 1997), but also
for the initial branding of the drug. By designing a drug name that is unique from other drug
names on the market, the likelihood that a prescription error involving that drug might be
reduced (Lambert et al., 2005).
Recent findings also suggest that word-characteristics might influence other cognitive
processes and higher-level decisions. Ellis, Holmes & Wright (2010) demonstrated that
brand-names, like real words in English, that are learned early in life (i.e., have an early
AoA) were recognized more quickly than brand-names acquired later in life. More
interesting was the finding that semantic knowledge (e.g., was the brand-name a type of
chocolate bar, aftershave, etc.) for early acquired brand-names was also accessed from
memory more quickly than semantic information for brand-names acquired later in life,
suggesting that word-characteristics (or in this case, the characteristics of brand-names) can
influence higher-level cognitive processes, not just those processes involved in the initial
perception of that word or brand name.
The work of Song and Schwarz (2009) further suggests that characteristics of a brand name
might influence higher-level cognitive processes, such as those processes involved in
assessing perceived risk. In three experiments, Song and Schwarz (2009) found that
participants rated names that were difficult to pronounce as being more harmful food
additives (Experiments 1 and 2), and as being riskier amusement rides (Experiment 3) than
names that were easier to pronounce. Song and Schwarz (2009) further speculated that
intentionally designing product names that were difficult to pronounce might alert
consumers to the risks posed by a potentially hazardous product, and motivate consumers to
pay closer attention to warnings and instructions.
In the present study we directly examined the influence of potential brand name-
characteristics on attitudes related to product consumption. In the studies by Song and
Schwarz (2009) ease of pronouncing the names was assessed by subjective ratings obtained
from another set of participants. Rather than use only subjective ratings of the names, we
objectively measured the phonotactic probability of the potential product names. Phonotactic
probability refers to the frequency with which a phonological segment, such as /s/, and a
sequence of phonological segments, such as /s^/, occur in a given position in a word
(Jusczyk, Luce & Charles-Luce, 1994). This objective measure of frequency of occurrence
is calculated by summing the frequency of all the words that contain a given segment (or
sequence of segments), and dividing by the summed frequency counts for all the words in
the dictionary that have a segment (or sequence of segments) in that position to produce a
token-based probability estimate of that segment (or sequence of segments). (More details
for how phonotactic probability is calculated can be found in Vitevitch & Luce (2004), as
can the URL for an on-line tool that can be used to objectively assess phonotactic
probability).
Previous psycholinguistic research showed that specially constructed nonwords with high
phonotactic probability tend to be rated as sounding more like English words than nonwords
with low phonotactic probability (Vitevitch, Luce, Charles-Luce & Kemmerer, 1997).
Furthermore, in a variety of language-related processing tasks, nonwords with high
phonotactic probability were responded to more quickly and accurately than nonwords with
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low phonotactic probability (Vitevitch & Luce, 1998; 1999). Moreover, Gathercole,
Frankish, Pickering and Peaker (1999) found in tests of short-term memory, that nonwords
with high phonotactic probability were recalled more accurately than nonwords with low
phonotactic probability. Together these findings suggest that the objective measure of
phonotactic probability successfully predicts performance in a variety of language-related
cognitive processes.
To examine whether phonotactic probability successfully predicts performance in a higher-
level cognitive process, such as the decision process used when choosing to purchase a
product, we explicitly asked participants in the present experiment to rate how likely they
were to purchase a product with a specially constructed name that varied in phonotactic
probability. This approach offered a direct assessment of the influence of a word-
characteristic (that was measured objectively rather than subjectively) on higher-level
attitudes and behaviors of the consumer than was afforded by previous studies. In a separate
task we asked the same participants to rate how much each nonword sounded like a real
word in English, which allowed us to also examine the relationship between subjective
measures of word-characteristics and objective measures of word-characteristics (Vitevitch
et al., 1997), and between subjective measures of word-characteristics and higher-level
attitudes and behaviors of the consumer.
We recognize that the domain we investigated in the present study—the decision process
used when choosing to purchase a product—has obvious application to commercial and
business domains. Our intent, however, was not simply to apply basic research findings to a
real-world domain. Rather, we wished to examine how certain word-characteristics might
influence the complex, higher-level cognitive process of deciding to purchase a product—a
process in which less than optimal decision-making and irrational choices are sometimes
made (e.g., consider for example the success of the VHS video tape format over the higher
picture-quality Betamax video tape format in the late 20th century). The less than optimal
and apparent irrational nature of the higher-level processes associated with deciding to
purchase a product contrasts with the (near) optimal performance associated with
fundamental memory and language processes. Therefore, the present study represents a shift
in the focus of basic research to a new area of cognitive processing influenced by a wider
variety of internal and external factors, not a shift from basic research to applied research.i
Methods
Participants
Nineteen participants were recruited from General Psychology courses taught at the
University of Kansas. Participants reported that they were native speakers of English, and
had no history of speech or hearing dis s. Compensation was given in the form of credit
toward a course requirement for all participants.
iBrand names themselves also warrant some attention from Psycholinguists and other Cognitive Scientists, because of the interesting
ways in which they differ from more conventional words and proper names. For example, brand names, like real words and proper
names, consist of a lexeme (i.e., the “word” or “name”) and a lemma (i.e., the referent, or the semantic or conceptual meaning).
However, brand names also represent perceptions and opinions about the products they are associated with, have a “value” in the
marketplace that can fluctuate over time, and can be used to indicate social status or affect one’s self-esteem. Furthermore, brand
names not only differentiate one product from a similar product in the market, but they also can be used—in what appears to be
circular logic—to justify a purchase decision (e.g., I bought this printer instead of that nearly identical printer because this printer is
“Brand X” and that printer is not). Direct investigation of brand-names themselves is beyond the scope of the present investigation,
however.
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Materials
The 60 consonant-vowel-consonant, monosyllabic nonwords (30 with high phonotactic
probability, 30 with low phonotactic probability) used in Vitevitch and Luce (2005) served
as stimuli in the present experiment. These items appear in the appendix. The phonotactic
probabilities for the stimuli were calculated using the Phonotactic Probability Calculator
(Vitevitch & Luce, 2004). For high phonotactic probability non-words, both the sum of
segments (mean = .167, SEM = .004) and the sum of sequences of segments (mean = .086,
SEM = .004) were both significantly higher (F (1, 58) = 193.57, p < .0001) than the sum of
segments (mean = .008, SEM = .001) and sum of sequences of segments (mean = .001, SEM
= .0001) for the low phonotactic probability nonwords.
An equal number of nonwords in each condition contained the same initial consonants (3
nonwords each started with /b/, /d/, /f/, /g/, /d3/, /m/, /n/, /p/, /r/, /t/). The stimuli were
recorded in an IAC sound attenuated booth using a high quality microphone at a sampling
rate of 44.1 kHz, and later edited into individual computer files (16 bit).
Procedure
Participants were seated in front of an iMac running PsyScope 1.2.5 (Cohen, MacWhinney,
Flatt, & Provost, 1993), which was used to present instructions, randomize and present
stimuli, as well as record responses. Participants were instructed that the experiment would
consist of two rating tasks. Both rating tasks used a 7-point Likert scale. In the word-
likeness task participants were asked to rate how well each stimulus sounded like an English
word. The value of 1 corresponded to “Bad English word” and the value of 7 corresponded
to “Good English word.” In the purchasing behavior rating task participants were asked to
rate how likely they would be to a product, based on the name alone. The value of 1
corresponded to “least likely to ,” and the value of 7 corresponded to “most likely to
.” The of the tasks was counterbalanced to minimize effects.
Each trial began with the word “Ready” appearing on the screen for 500ms, followed by the
random presentation of a stimulus over Beyer dynamic DT100 headphones at a comfortable
listening level (approximately 65 db). After the participant responded with a number
between 1 and 7, and hit the return-key on the computer keyboard, the next trial began.
Results and Discussion
Previous studies have shown that listeners subjectively rate specially constructed nonwords
with high values of objectively measured phonotactic probability as sounding more like
English words than specially constructed nonwords with low values of phonotactic
probability (Vitevitch et al., 1997). Similar results were obtained in the present experiment.
Wordlikeness ratings were significantly and positively correlated with both objective
measures of phonotactic probability: sum of the segments (r = .55, z (60) = 4.72, p < .0001),
and sum of the biphones (r = .56, z (60) = 4.80, p < .0001). Note that the study by Vitevitch
et al. (1997) used nonwords that contained two syllables, whereas the present study
employed monosyllabic nonwords. Therefore, the present findings represent an important
replication of previously observed results.
We also found that the subjective ratings of word-likeness for a given item significantly
correlated with ratings of likelihood to a product with that name (r = .70, z (60) = 6.57,
p < .0001). That is, nonwords that sounded more like an English word also had names that
made it more likely a listener would purchase a product with that brand name than, whereas
nonwords that sounded less like an English word had names that made it less likely a
listener would purchase a product with that brand name. This result suggests that higher-
level cognitive processes can be influenced by word-characteristics related to how easily the
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Gabriel
Sticky Note
Marked set by Gabriel
Gabriel
Sticky Note
Marked set by Gabriel
Gabriel
Sticky Note
Marked set by Gabriel
brand name can be pronounced, and is consistent with the findings by Song and Schwarz
(2009), who used subjective ratings of ease of pronunciation and risk perception of specially
created product names. Together these results suggest that subjectively measured
characteristics about words or brand names influence higher-level cognitive processes.
Of primary interest in the present study is the significant correlation between the objective
measures of phonotactic probability of the brand names and the subjective ratings of
likelihood to a product with that brand name. Both objective measures of phonotactic
probability were significantly and positively correlated with the subjective ratings of
likelihood to a product with that brand name: sum of the segments (r = .51, z (60) =
4.27, p < .0001), and sum of the biphones (r = .48, z (60) = 3.98, p < .0001). The present
results suggest that phonotactic probability influences higher-level cognitive processes, like
those involved in deciding to a consumer product, in addition to influencing the initial
perception and linguistic processing of nonwords (as demonstrated by Vitevitch & Luce,
2005).
The demonstration that objective measures of word characteristics—specifically phonotactic
probability—influence higher-level decisions is important for at least two reasons. First,
word-characteristics that were previously thought to influence only language-related
processes also affect other cognitive processes (i.e., the decision process involved in whether
to a product or not). This finding lends some credence to the contested Sapir-Whorf
hypothesis, which suggests that language usage influences other cognitive processes (see
also Saussure, 1966).
Second, these findings demonstrate that objective measures rather than subjective measures
of words (as in Song & Schwarz, 2009) can be used to assess how a word is pronounced
might influence higher-level cognitive processes. Although the subjective ratings of word-
likeness in the present experiment accounted for more variance (r2 = .49) than the objective
measures of phonotactic probability (r2 = .26), objective measures of word-characteristics
are widely and freely available for use (e.g., Vitevitch & Luce, 2004). In contrast, reliable
subjective ratings require adequate sample sizes or multiple measures from the same
individuals (Herzog & Hertwig, 2009; Vul & Pashler, 2008). Furthermore, objective
measures of word characteristics can be obtained easily for large sets of potential product
names, whereas if one wishes to evaluate a large number of potential product names, one
must be concerned about fatigue influencing participant responses in a subjective rating task.
Therefore, objective measures of word-characteristics offer an easy, quick, and inexpensive
method to assess potential brand names.
Although a number of brand names are monosyllabic (nonce) words (e.g., Dodge Ram
[automobile], (Chevrolet) Volt [automobile], Skoal [tobacco product], GAP [line of clothing
and store], Surf [detergent], (Nintendo) Wii [video game system], Crest [toothpaste]), there
are many brand names that are multisyllabic. Given that Vitevitch et al. (1997) found that
the phonotactic probability of specially constructed bisyllabic words influenced
wordlikeness ratings—much like the phonotactic probability of specially constructed
monosyllabic words influenced wordlikeness ratings in the present study—it would be
surprising if a similar relationship between phonotactic probability and purchase likelihood
were not observed in longer brand names. We leave this issue for future research, however.
The significant correlation between phonotactic probability of brand names and ratings of
likelihood to a product with that name also suggests there are a number of issues to
consider when designing brand names. Recall Lambert et al. (2010) found that drug-names
that were similar to many other drug-names were more likely to be involved in a
prescription error than drug-names that were similar to few other drug-names; the number of
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Gabriel
Sticky Note
Marked set by Gabriel
Gabriel
Sticky Note
Marked set by Gabriel
Gabriel
Sticky Note
Marked set by Gabriel
similar sounding drug-names is often referred to as neighborhood density. Vitevitch et al.
(1999) found a significant correlation between neighborhood density and phonotactic
probability for real words in English. Real English words that had many similar sounding
words (a dense neighborhood) tended to be comprised of segments and sequences of
segments that occurred often in the language (high phonotactic probability), whereas real
English words that had few similar sounding words (a sparse neighborhood) tended to be
comprised of segments and sequences of segments that occurred less often in the language
(low phonotactic probability). Thus, there are a number of factors involved in finding a
brand name that maximizes the likelihood that a consumer will be interested in purchasing
the product (i.e., it has high phonotactic probability), while minimizing the confusability of
that name with other products on the market (i.e., it has a sparse neighborhood).
Future studies in which neighborhood density and phonotactic probability are independently
and parametrically manipulated (e.g., Storkel & Lee, 2011; Vitevitch, Armbrüster & Chu,
2004) may be required to determine the location of a brand name “sweet spot” that
maximizes consumer appeal, while minimizing problems related to the discrimination of the
product from other related products. Additional studies might also examine how
neighborhood density and phonotactic probability influence (1) the acquisition of brand
names, much like Storkel and Hoover (2011) have examined how these characteristics
influence the acquisition of real words, or (2) recall of brand names, much like Roodenrys et
al. (2002) has examined how these characteristics influence the memory for real words.
Admittedly, there are many characteristics that influence the success of a product with a
given brand name. Some of those characteristics are related to the name (e.g., the descriptive
or evocative nature of the name), while other characteristics are related to the product itself
(e.g., utility, quality, packaging, and price, etc.). The results of the present experiment found
that one factor—phonotactic probability—accounts for a small, but statistically significant
amount of variance in the likelihood that a product will be purchased. This observation is
important for developing brand names that have a higher likelihood of being successful in
the market, especially in tough economic times, and may be useful in developing automatic
brand name generators (e.g., http://business-name-generators.com or http://
www.netsubstance.com) that produce successful brand names.
Acknowledgments
This research was supported in part by grants from the National Institutes of Health to the University of Kansas
through the Schiefelbusch Institute for Life Span Studies (National Institute on Deafness and Other Communication
Dis s (NIDCD) R01 DC 006472), the Mental Retardation and Developmental Disabilities Research Center
(National Institute of Child Health and Human Development P30 HD002528), and the Center for Biobehavioral
Neurosciences in Communication Dis s (NIDCD P30 DC005803).
Appendix
The stimulus items used in the present experiment (from Vitevitch & Luce, 2005). The
words are transcribed using the computer-readable symbols described in Vitevitch and Luce
(2004).
High Phonotactic Probability Low Phonotactic Probability
b@z bcS
bEs bRS
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http://business-name-generators.com
http://www.netsubstance.com
http://www.netsubstance.com
High Phonotactic Probability Low Phonotactic Probability
bIT bYJ
dEm dcb
des deD
d^p dRf
fIm fOz
fYd fRp
fYs fWC
gEl gRp
gId gWb
gYn gYT
J@d JeS
JIt JRS
Jor JYg
mEk mOk
mos mRz
mWn mWb
nEs nES
nId nRg
n^s nWb
pim pRg
pIz pUC
pYd puJ
rEn rOk
rEs rWb
rIz r^D
t@s teS
tes toJ
tIC tWz
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