speech priming: evidence for rate persistence in unscripted speech
TRANSCRIPT
This article was downloaded by: [University of Illinois Chicago]On: 28 October 2014, At: 11:56Publisher: RoutledgeInforma Ltd Registered in England and Wales Registered Number: 1072954 Registeredoffice: Mortimer House, 37-41 Mortimer Street, London W1T 3JH, UK
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Speech priming: Evidence for ratepersistence in unscripted speechMelissa K. Jungers a & Julie M. Hupp aa The Ohio State University – Newark , Newark, OH, USAPublished online: 03 Apr 2009.
To cite this article: Melissa K. Jungers & Julie M. Hupp (2009) Speech priming: Evidence forrate persistence in unscripted speech, Language and Cognitive Processes, 24:4, 611-624, DOI:10.1080/01690960802602241
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Speech priming: Evidence for rate persistence in
unscripted speech
Melissa K. Jungers and Julie M. HuppThe Ohio State University � Newark, Newark, OH, USA
Previous research has shown evidence for priming of rate in scripted speech.Two experiments examined the persistence of rate in production of unscriptedpicture descriptions. In Experiment 1, speakers heard and repeated primingsentences presented at a fast or slow rate and in a passive or active form.Speakers then described a new picture. The timing of their productionsreflected the timing of the prime. In Experiment 2, participants heard but didnot repeat the priming sentences. As in Experiment 1, their picture descriptionsreflected the rate of the priming sentences. These experiments demonstratepersistence of rate, an acoustic dimension related to prosody, in unscriptedspeech. The persistence in timing may provide a social advantage and help tocoordinate conversation.
Keywords: Prosody; speech production.
There is a long tradition in the speech literature of examining not only what
is said, but also the way it is said (Ferreira, 1993; Lehiste, 1973). Acoustic
variations in stress, pitch, and timing inform the listener of sentence meaning
beyond the word level and may influence the listener’s future productions
(Jungers, Palmer, & Speer, 2002). The goal of the current study is to examine
whether listeners persist in the rate of previously heard sentences when they
produce unscripted picture descriptions.
Prosody has been described as the suprasegmental features of speech such
as pitch, timing, and loudness (Cutler, Dahan, & Donselaar, 1997). Prosodic
emphasis influences the interpretation of sentence meaning (Speer, Crowder,
& Thomas, 1993), and intonation helps listeners disambiguate the meaning
Correspondence should be addressed to Melissa Jungers, Ohio State University � Newark,
1179 University Dr., Newark, Ohio 43055, USA. E-mail: [email protected]
We would like to thank Kristin Vanover, Whitney Sims, and Ashley Shaw for their assistance
in collecting data.
LANGUAGE AND COGNITIVE PROCESSES
2009, 24 (4), 611�624
# 2009 Psychology Press, an imprint of the Taylor & Francis Group, an Informa business
http://www.psypress.com/lcp DOI: 10.1080/01690960802602241
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of ambiguous sentences (Lehiste, 1973; Lehiste, Olive, & Streeter, 1976; Price,
Ostendorf, Shattuck-Hufnagel, & Fong, 1991). The placement and duration
of pauses provides another perceptual cue to sentence meaning; speakers’
pause patterns tend to correlate with the syntactic structure of a sentence,with longer pauses near important structural boundaries (Lehiste et al.,
1976). Although syntax influences prosody, there is a hierarchical structure
for prosody that is distinct from the syntactic representation (Beckman,
1996; Ferreira, 1993; Warren, 1996). Shattuck-Hufnagel and Turk (1996)
propose that syntax is just one of many factors influencing prosody,
including semantics, pragmatics, length, and rate. For example, when
speakers are asked to produce sentences at a slow rate, they show pauses
at lower levels in the prosodic hierarchy than when producing fast sentences(Gee & Grosjean, 1983).
Prosody and other non-verbal cues are involved in communication. What
happens to these extralinguistic features once an utterance is finished? The
approach of normalisation assumes that listeners ignore the acoustic details
in order to understand the message. On this account, listeners transform the
physical speech signal into a standard representation of the sentence devoid
of prosodic details (Pisoni, 1997). This approach is plausible because
listeners can comprehend highly variable speech that differs in pitch rangeor dialect. According to this approach, the acoustic details of a production
will not be retained.
However, several studies suggest that acoustic features of speech are
incorporated in memory for language. Sentences are recognised more
accurately when they are presented with the same prosody at learning and
test (Speer et al., 1993). Listeners use extralinguistic information, including
talker’s speaking rate, to accurately identify previously presented words
(Bradlow, Nygaard, & Pisoni, 1999). The rate of production affects listeners’abilities to recall items produced by different speakers. Listeners show better
recall for those items produced at the same rate in both familiarisation and
test than for items presented at different rates from familiarisation to test
(Nygaard, Sommers, & Pisoni, 1995). These findings suggest that extra-
linguistic cues such as rate influence memory for speech contents.
If extralinguistic information is retained in memory, it is possible that
such cues could influence future productions. One aspect of speech that
persists from perception to production is syntax. When listeners are asked torepeat a sentence they had heard and then produce a description of a picture,
they tend to use the same syntactic form as in the original sentence to
describe the scene (Bock, 1986). In addition, bilingual speakers who are
primed with a syntactic form persist in the syntax across languages (Loebell
& Bock, 2003). Since this persistence extends beyond adjacent sentences and
influences the syntactic structure of future sentences, structural persistence is
thought to relate to implicit learning of sentence construction (Bock &
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Griffin, 2000). Further, this persistence does not depend on production of
the primes and is present across many lags (Bock, Dell, Chang, & Onishi,
2007). As mentioned previously, syntax is just one of several factors
influencing prosody. Thus, it is reasonable to assume that other components,such as speech rate, may function like syntax and also show persistence.
There is already some evidence for rate persistence in scripted speech.
Kosslyn and Matt (1977) played a recording of two male speakers: one
speaking at a fast rate and one at a slow rate. Then the participants read
aloud a passage they were told was written by one of the speakers. The
participants imitated the rate of the speaker who supposedly wrote the
passage, although they were not explicitly instructed to do so. It is possible,
however, that subjects may have associated each written passage with aparticular speaker and felt an expectation to reproduce the rate of that
speaker. Similarly, Jungers et al. (2002) found evidence for prosodic
persistence in scripted speech. In one experiment, listeners heard a fast or
slow prime sentence followed by a written target sentence matched for length,
lexical stress pattern, and syntactic structure. When participants read the
target sentences aloud, their produced target rates were influenced by the
primed rate.
The study by Jungers et al. (2002) suggests that people persist in the globalprosodic dimension of tempo when reading sentences aloud, but the study
has some limitations. All of the prime and target sentences were in the active
form and matched in stress pattern and length. The current study seeks to
determine if speakers will persist in the rate when they produce an unscripted
picture description. The goal is to examine whether speakers’ production
rates will be influenced by priming sentences. Previous literature has
demonstrated syntactic priming in picture description tasks, but rate priming
has not been demonstrated in this ecologically valid way. If rate primingserves a communicative function in conversation, it is important to
demonstrate that the effect is not limited to scripted speech.
Thus, Experiment 1 asked whether speakers persist in the rate of sentences
they hear when they repeat the primes or create their own picture
descriptions. Both active and passive transitive sentences were used so that
results could be generalised across syntactic form. A final memory
recognition task was used to reduce demand characteristics such that
participants would focus on their memory for the sentences instead of onthe specific acoustic details of the sentences. By concentrating on their
memory for the sentences, participants were less likely to be aware of the rate
manipulation and less likely to consciously alter their speech.
Experiment 2 examined whether rate persistence is due to articulatory
priming. In this case, articulatory priming refers to the physical practice of
producing the sentence. In Experiment 1, the speakers repeated the priming
sentence before describing a new picture. To rule out the possibility that
SPEECH PRIMING 613
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priming results were due to simply having physically practiced the particular
rate, in Experiment 2, speakers listened to but did not repeat the priming
sentence. A similar memory test followed. If priming is simply due to
practice articulating sentences at particular rates, then the rate persistenceshould be weaker in Experiment 2 than in Experiment 1. However, if rate
persistence is due to an internal representation of the timing aspects of the
sentences, then similar results will be observed in the two experiments.
EXPERIMENT 1
The goal of this experiment was to determine if speakers persist in the rate
they have just heard when they describe a new picture. Listeners heard primes
that were presented at a fast or slow rate. On each trial, participants heard a
sentence that described a picture on the screen. They repeated that sentence
and then described aloud a new picture. Their productions were analysed fortiming.
Method
Participants. Twenty-four adults who were native English speakers at alarge university in the Midwest participated in the study. Participants
received course credit in an introductory psychology course.
Apparatus. Participants heard language stimuli over AKG K270 head-
phones, and their voices were recorded to CD using a head-mounted AKG
C420 microphone. The auditory stimuli and the pictures were presented
using PowerPoint on a personal computer.
Materials. The experiment consisted of 24 transitive sentence primes
that described the action in a picture. The experiment also included 24
additional target pictures that subjects described aloud. Pictures included
cartoon characters involved in an action. The prime sentences were recorded
by a female speaker who listened to a metronome to create the tempi. The
slow was created with stressed syllables set to 60 bpm (beats per minute) and
the fast was set to 120 bpm. The sentences sounded natural, with the fast
sentence primes averaging 0.24 s/syllable and the slow sentence primesaveraging 0.40 s/syllable. Half of the sentences described the action in active
form while the other half described the action in passive form.
A 24-item memory test on the prime sentences included five types of
items: same tempo-same syntax, same tempo-different syntax, different
tempo-same syntax, different tempo-different syntax, and foils. There were
12 items related to the study and 12 foils. The foils contained some of the
same words used in the original sentences so that participants could not use a
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single word or phrase to remember a sentence. The foils also were balanced
for syntactic form and tempo.
Design. The independent, within-subject variable was rate (slow, fast).
The rate was blocked across trials; participants heard slow sentences
followed by fast sentences or vice versa. The order (first block/ second
block) was a counterbalancing variable. It was necessary to block the fast
and slow stimuli so that participants would be unaware of the rate
manipulation. The same sentence was heard at a fast tempo for half the
participants but at a slow tempo for the other participants. The syntactic
form was randomised across trials; an individual sentence was either active
or passive for all participants.
The dependent variable was the timing produced by participants. Sentence
timing was analysed by two independent coders who determined the
beginning and end of each sentence both by listening to and by looking at
the waveform in Adobe Audition.
Procedure. The participants first described aloud three pictures pre-
sented on the computer screen to practice using the apparatus. On each
experimental trial, participants listened to a prime sentence describing the
picture on the screen, repeated that sentence, and then produced a
description of the next picture. See Figure 1 for an example of the trials.
The first trial served as a practice trial for the procedure. The participants
were instructed to pay careful attention to the sentences because they would
be asked to recognise them later. There were a total of 24 experimental trials,
presented in two blocks of 12 trials. Between blocks, participants completed
a paper and pencil questionnaire about their music and language back-
ground.Following the picture description task, participants listened to a 24-item
memory test. On each trial, the sentence was heard twice. On paper, the
participants circled ‘yes’ or ‘no’ to whether the sentence described a picture
they saw during the experiment.
Results
Production task. Preliminary analyses revealed no effect of syntactic
form or blocking order (whether fast or slow block presented first), so they
were eliminated from subsequent analyses. The sentences were produced
without a script, so differences between the exact choice and number of
words may result. In order to account for variations in picture descriptions,
an analysis of syllable timing was conducted by dividing the total utterance
time by the number of produced syllables. A repeated measures ANOVA with
repetition condition (repeat, describe) and speaking rate condition (fast,
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slow) as factors showed a significant effect for speaking rate condition by
subject, F1(1, 23)�10.2, pB.01, l2�0.31, and by item, F2(1, 46)�39.54,
pB.01, l2�0.46. As seen in Figure 2, speakers produced faster sentences
following the fast prime than following the slow prime. Planned comparisons
revealed that this effect occurred both when participants repeated the prime
and when they described the new scene (pB.05). There were no differences in
rate for repetition condition, F1(1, 23)�0.06, ns, F2(1, 46)�0.24, ns, and no
Figure 1. Sample trials for Experiment 1.
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interaction between repetition condition and speaking rate condition,
F1(1, 23)�1.8, ns, F2(1, 46)�1.9, ns. There were no differences in rate
between the first and second halves of each block and no interaction between
the block halves (first half, second half) and rate condition (fast, slow). This
suggests that participants were not slowing or speeding systematically across
the items within each block.
Memory recognition task. An ANOVA on percent ‘yes’ response by type
of item (from study or foil) showed a significant difference, with subjects
most often responding ‘no’ to the foil items, thereby demonstrating a high
degree of overall accuracy both by subjects, F1(1, 23)�113.6, pB.05,
l2�0.83, and by items, F2(1, 23)�26.9, pB.05, l2�0.55. A repeated
measures ANOVA on percent ‘yes’ response to the items from the study with
tempo (same as study/new tempo) and syntactic form (same as study/new
form) as factors showed a significant effect for speaking rate condition, with
participants more likely to respond ‘yes’ to items in the same tempo,
F1(1, 23)�14.5, pB.01, l2�0.39, but no effect for syntactic form, F1(1,
23)�1.1, ns, and no interaction between tempo and syntactic form, F1(1,
23)�2.5, ns. An ANOVA by item on percent ‘yes’ response to the items from
the study with tempo and syntactic form as factors showed the same trend as
the analysis by subject, with participants more likely to respond ‘yes’ to items
in the same tempo, F2(1, 11)�3.64, p�.09, l2�0.31, but no effect for
syntactic form, F2(1, 11)�0.18, ns, and no interaction between tempo and
syntactic form, F2(1, 11)�0.42, ns. By category, the percent ‘yes’ responses
were: same tempo-same syntax�79%, same tempo-different syntax�65%,
Figure 2. Experiment 1. Timing by syllable for repeated and created picture descriptions.
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different tempo-same syntax�49%, different tempo-different syntax�51%,
and foils�20% (expected response ‘no’).
Discussion
This experiment demonstrated that participants encode timing information
when they listen to and repeat a sentence. This timing persistence was seen
for both active and passive sentences. The lack of systematic difference in
tempo between the first and second halves of each block suggests a local
priming effect which reflects the immediate processing of the prime instead
of a cumulative global effect. The memory test reveals that participants were
most accurate in their response to items identical to those heard before.
Participants were more likely to respond ‘yes’ to items with the same tempo
as heard in the study, despite the fact that the question was whether the
sentence referred to a picture they had seen in the study. The syntax and
timing should not influence this decision, but the participants’ responses
suggest that timing was encoded in memory. The main finding is that when
participants were primed with a fast sentence, they produced unscripted
picture descriptions that were faster than if they were primed with slow
sentences. However, it can be argued that this rate priming was dependent
upon articulation of the timing information. Experiment 2 examines whether
this effect was due to articulatory priming by having the participants listen to
but not repeat the priming sentence.
EXPERIMENT 2
The goal of Experiment 2 was to determine if speakers persist in the rate of a
sentence they have just heard when they describe a new picture, even when
they do not repeat the priming sentence. As in Experiment 1, listeners heard
primes that were presented at a fast or slow rate. On each trial, participants
heard a sentence that described a picture on the screen and then created their
own description of a subsequent picture. If speakers show rate persistence as
in Experiment 1, this would argue for priming based on an internal
representation and not on practice producing the rate of the previous
sentence.
Method
Participants. Twenty-four adults who were native English speakers at a
large university in the Midwest participated in the study. Participants
received course credit in an introductory psychology course. Participants
had not participated in Experiment 1.
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Apparatus and materials. The equipment and materials were the same as
in Experiment 1.
Design and procedure. The design was the same as in Experiment 1. Theparticipants first described aloud three pictures to become accustomed to the
equipment. On each experimental trial, participants listened to a prime
sentence describing the picture on the screen and then produced a
description of another picture. Unlike Experiment 1, the participants did
not repeat the priming sentence aloud. The first trial served as a practice
trial. There were a total of 24 experimental trials, presented in two blocks of
12 trials. Following the picture description task, participants listened to a 24-
item memory test. On each trial, the sentence was heard over headphones
two times. On paper, the participants circled ‘yes’ or ‘no’ to whether the
sentence described a picture they saw during the experiment.
Results
Production task. As in Experiment 1, preliminary analyses revealed no
effect of syntactic form of prime sentence or blocking order (whether fast or
slow block presented first), so they were eliminated from subsequent
analyses. A repeated measures ANOVA on syllable timing showed differences
between new sentences produced after fast and slow primes by subjects, F1(1,
23)�8.59, pB.01, l2�0.27, and by items, F2(1, 23)�4.86, pB.05, l2�0.18. As seen in Figure 3, speakers produced faster sentences following the
fast primes. There were no differences in rate between the first and second
halves of each block and no interaction between the block halves (first half,
second half) and rate condition (fast, slow). This suggests that participants
Figure 3. Experiment 2. Timing by syllable for picture descriptions following fast and slow
prime sentences.
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were not slowing or speeding systematically across the items within each
block.
Memory recognition task. An ANOVA on percent ‘yes’ response by typeof item (from study or foil) showed a significant difference both by subjects,
F1(1, 23)�75.9, pB.05, l2�0.77, and by items, F2(1, 23)�19.7, pB.05,
l2�0.47, with subjects most often responding ‘no’ to the foil items thereby
demonstrating a high degree of overall accuracy. A repeated measures
ANOVA on percent ‘yes’ response to the items from the study with tempo
(same as study/new tempo) and syntactic form (same as study/new form) as
factors showed a significant effect for speaking rate condition, with
participants more likely to respond ‘yes’ to items in the same tempo, F1(1,
23)�12.3, pB.01, l2�0.35, but no effect for syntactic form, F1(1, 23)�0.02, ns, and no interaction between tempo and syntactic form, F1(1, 23)�3.09, ns. An ANOVA by item on percent ‘yes’ response to the items from the
study with tempo and syntactic form as factors showed the same trend as the
analysis by subject, with participants more likely to respond ‘yes’ to items in
the same tempo, F2(1, 11)�2.78, p�.13, l2�0.26, but no effect for
syntactic form, F2(1, 11)�0.01, ns, and no interaction between tempo and
syntactic form, F2(1, 11)�0.50, ns. By category, the percent ‘yes’ responses
were: same tempo-same syntax�74%, same tempo-different syntax�65%,
different tempo-same syntax�47%, different tempo-different syntax�54%,
and foils�23% (expected response ‘no’).
Discussion
This experiment demonstrated that participants encode rate information
when they produce new sentences to describe pictures. When participants
were primed with a fast sentence, they produced unscripted picture
descriptions that were faster than if they were primed with slow sentences,
even though they did not repeat the prime. This suggests that the rate
priming observed in Experiment 1 was not due to articulatory priming
(the physical practice of producing the primes). It is possible, however,
that participants engaged in tacit motor activity without actually moving
the articulators. As in Experiment 1, the results point to a local priming
effect since there were no systematic differences between the timing in the
first and second halves of each block. Also as in Experiment 1, the
memory test reveals that participants were most accurate in their response
to items with the same tempo as heard before, despite the fact that the
question was whether the sentence referred to a picture they had seen in
the study.
To rule out an awareness of the rate manipulation as an explanation for
the rate persistence results, an additional 12 participants from the same pool
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participated in the study and were asked several questions after the
completion of the study. These questions included: What was the goal of
the study? What were the sentences like? All 12 participants responded that
the goal of the study was to test their memory for sentences. Some indicated
that the sentences differed in syntactic form, but no participant indicated
anything about the timing manipulation. Although this may seem a
surprising result, it is in line with other research that suggests conversation
partners are unaware of their convergence in speech and only notice large
and conversationally inappropriate differences (Street, 1990; Street & Brady,
1982). These additional participant responses along with the instructions to
focus on the upcoming memory test during the task lend confidence that the
results are not due to demand characteristics.
GENERAL DISCUSSION
The central finding of this study was the rate persistence, both with and
without repetition of the prime. The rate differences did not relate to the
syntax, but listeners still persisted in rate for both active and passive primes.
Past studies have shown rate persistence in scripted speech (Jungers et al.,
2002), but this is the first instance of prosodic persistence in an unscripted
task (for similar results with children, see Hupp & Jungers, in press). In the
first experiment, listeners persisted in the timing of picture descriptions after
repeating a priming sentence. In the second experiment, listeners again
produced picture descriptions that were similar in rate to the prime
sentences, even without the repetition of the prime. Thus, the priming effects
are not due to physical practice with articulating the priming sentence which
would support the notion of an internal representation of the timing
information. This effect of persistence was small relative to the difference
in primed rates. This may be due to the fast prime more closely resembling
speakers’ natural rates of speech than the slow prime. This study extends
previous work by eliciting picture descriptions; rate priming in these
unscripted productions lends support to the ecological validity of this effect.
Why might it be useful to persist in timing? Continuing the timing from
speaker to listener may help to coordinate conversation. Conversation
partners increase their comprehensibility by accommodating to each others’
speech patterns (Giles & Powesland, 1975). Such speech convergence has
been observed for extralinguistic features including utterance length, vocal
intensity, and pause length (Giles, Coupland, & Coupland, 1991). Com-
munication is facilitated because the conversation partners more efficiently
process the message when the extralinguistic features match (Berger &
Roloff, 1980). Implicit learning of paralinguistic norms may be helpful as a
listener begins to incorporate the particular speech patterns of a region or
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dialect. For example, rate differences exist between American and New
Zealand English (Robb, MacLagan, & Chen, 2004).
What mechanism might explain this rate persistence? One possibility is
that conversation partners’ syllable rates become entrained via oscillatorsin the brain (Wilson & Wilson, 2005). At the neural level, there is
evidence for mirror neurons that may control coordination (Dale &
Spivey, 2006). Another possibility is that rate is one of a number of levels
that are aligned automatically in dialogue (Pickering & Garrod, 2004).
Such a mechanism assumes that the comprehension and production
systems align at each level (syntactic, lexical, semantic) via priming. The
comprehension system may use an emulator that covertly imitates and
leads to predictions about the current input, allowing rapid processing(Pickering & Garrod, 2007). Although we believe that the current results
arise from straightforward and automatic priming of speech structures in
speaker and listener, we acknowledge that a full explanation of alignment
in dialogue should allow for the influence of social-motivational factors.
For example, the degree of phonetic convergence in a conversational task
is determined by the role of the participant and the sex of the pair of
talkers (Pardo, 2006).
These experiments demonstrate persistence of rate in unscripted speech.Thus, acoustic features are retained from perception to production, arguing
against a normalisation process. It is possible that this priming is temporary.
Further studies can examine the duration and strength of
the prime. The persistence in timing may provide a social advantage and
help to coordinate conversation. Such coordination may arise from an
automatic process in dialogue in which speaker and listener align their
speech at multiple levels.
Manuscript received March 2008
Revised manuscript received November 2008
First published online January 2009
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