Management of Stuttering
Management of Stuttering
COUNSELLING
Stuttering, like many complex human conditions and behaviours, results from a complex
interaction of a number of innate and environmental factors. For most children and adults
who stutter, these factors include the speech behaviours that characterize stuttering (e.g.,
sound and syllable repetitions and sound prolongations), as well as the thoughts and emotions
that develop in reaction to the experience of stuttering. For families, especially the parents of
children who stutter, coping with their emotions and reactions to the child or adult who
stutters is often a key issue. It is this piece of the stuttering puzzle, the thoughts, beliefs and
emotions surrounding stuttering that are the focus of the counselling process in treatment.
According to Luterman (2001), suggests an approach to counselling our clients, one that is
rooted in a process of listening and valuing their stories, thoughts, emotions, and concerns.
Through listening and valuing, we assume that clients and their families are competent to
solve their problems without our explicit instructions. It is emotion, what the client and
family do both consciously and unconsciously to cope with and adjust to the problem (Beck,
1995) not rational thought, that most strongly influences behaviour. The clinical significance
is that without helping the client and family to uncover the way they feel about the problem,
and how these emotions contribute to their actions, it really doesn't matter what therapy road
we persuade them to follow; they will not be fully on board. What we advise and suggest will
be less powerful than what the client and family feel in determining their actions.
Purpose of counselling:
1. to share information – regarding the nature and severity of the problem, cause/s,
preventive measures if any
2. To offer advice – type/s and duration of treatment required, prognosis, options/
alternatives, cost, facilities available & addresses
3. To assist care givers and significant others in understanding and coping up with the
problem
4. Catharsis – to provide opportunity to ventilate feelings
The long term goals of counselling are to assist parents in coming to accept their child’s
stuttering and their feelings about the problem and to cope positively with their child and her
stuttering.
Ramig and Dodge (2010) explained that the parents need to know the number of factors
which helps in achieving fluency for their child, such as, minimizing interruptions, speaking
slower, respecting silence, minimizing rushing and hurrying, asking one question at a time,
teaching turn taking, and building self-esteem etc.
Nelson (2006) emphasizes a variety of recommendations for family members that can be
incorporated into the counselling:
● A child who stutters should be treated as a “regular kid” – a child who happens to
stutter.
● Children who stutter take more time to talk and, therefore, needs patient listeners.
● Do not let brothers or sisters imitate or tease the child about his stuttering.
● People involved in the child’s life should be instructed to listen to what the child
says, not how he says.
● When children who stutter feel pressured, their stuttering can be aggravated.
● If fatigue increases a child’s stuttering, make sure he gets plenty of rest.
● Family members should avoid correcting the child’s stuttering- it does not help.
This technique also helped the child learn how to verbally describe his/her feelings and talk
about them.
Another procedure that Van Riper used involved projective drawings of the feelings evoked
by stuttering. Both the child and Van Riper drew and labelled their own pictures representing
anger, fear, helplessness, sadness, shame and others. After the drawings on the cards were
made, they were laid on the table. Then while the child was talking and had a moment of
stuttering, the child picked up that she felt best reflected her feelings at the moment, and Van
Riper picked up a card that he had drawn that he thought represented the child’s feelings.
They compared the card to see if the child and Van Riper picked up the same card.
Adolescents who stutter
Zebrowski (2006) discusses the challenges that the adults face when attempting to teach,
guide, instruct, and advice adolescents. Adolescents undergo many cognitive, emotional and
physical changes. A major developmental task during the teenage years is the individuation,
or becoming more independent from parents and developing a separate identity.
Consequently, teens are frequently resistant to or uninterested in what adults have to teach
them. Thus, the way that teens present themselves to clinicians can result in appearing
unmotivated.
When working with adolescents, it is important to ask them about their experiences and to
“treat them as the expert” rather than to “preach” them. Luterman (2008) encourage clinicians
to listen and value the adolescent and view him as competent to make good clinician.
Curlee (2008) talks about self-defeating thoughts and behaviours that teenager who stutters
often use. People can change their beliefs by changing their behaviours, and they can change
their behaviours by changing their beliefs. Adolescents may believe that they cannot do
something, but once they work on it they discover they can do it and they change their beliefs
about it. Many people need to believe that they can accomplish something long before they
accomplish it.
Williams (2008) mentioned that many parents do not talk to their children about their
stuttering because:
● They are afraid it would upset their child if they showed disappointment in the way
their child talks
● They feel their child’s stuttering is not a big issue to them
● Their child does not like to talk about personal things
● They just do not know enough about stuttering and they do not know what to say
Adults who enter therapy for their stuttering problem may have other problems that become
apparent as therapy progresses. Stuttering and anxiety are commonly intertwined and
interrelated. When a clinician becomes aware of such symptoms or other significant
psychological or emotional concerns that are outside the scope of practice, it is appropriate
and ethically responsible for the clinician to suggest or recommend that the person seek help
from a mental health professional.
Principles of counselling for adults who stutter
Cooper (1997) describes stuttering in adults as a syndrome that consists of multiple,
coexisting and interactive affective, behavioural, and cognitive components coalescing over a
period of years. Each of these three major components of stuttering needs to be addressed n
therapy, and counselling is an essential part of any therapy that works with the entire person
and not just the stuttering behaviours.
Sheehan (2008) offered several principles for counselling people who stutter, with emphasis
on the feeling level:
● Create a relationship and an atmosphere in which the person is able to express
whatever he feels. Help him understand that he is never wrong on the feeling level,
and never tell the client, “You shouldn’t feel that way.”
● Help the person realize his potential for growth and development and self-realization.
● Begin where the client is, not where the clinician is. Give him room to feel
comfortable about the way he feels.
● Respect the person’s feelings of frustration, fear, anger, shame, guilt, and so on as
being valid.
● Help him discover that the more guilt, shame, and hatred he attaches to his stuttering,
the more he holds back and try to hide his stuttering, results in even more stuttering
● Deal with the here and now. Emphasise the possibilities of the future, not the mistakes
of the past.
● Let the person know that you are interested in more than just the stuttering, that you
are interested in him as a person, what he thinks and feels, and that you have
unconditional positive regard.
● Every client should be encouraged to develop initiative and independence of the
therapist by learning how to recognise which assignments he needs to work on for the
maintenance of his improved speech.
GROUP THERAPY
Fluency disorders are multidimensional commonly including a sense of isolation, and
negative thoughts and feelings (Liddle, James and Hardman, 2011). Group therapy has
certain qualities that can help address these aspects of the disorder. In particular, group
therapy provides an opportunity for peer support which has been found to reduce
victimisation and anxiety around bullying, increase self-confidence, and reduce feelings of
isolation. In addition Williams and Dugan 2002, suggest that child in a group setting is
motivated by his/her peers success and becomes empowered by the peer support.
Need/ Goals of group therapy:
● To promote group interaction
● Facilitate socialization & communication in social context
● Competitiveness and better learning
● Develop a sense of self reliance
● Transfer and generalize the skills
● Promote emotional support
Better utilization of clinician’s time
Pre-requisites:
● Group homogeneity with respect to age, disability, capability, language
● Adequate no. of children/adults; ideal group size is about 7 people, but can have as
many as 12-13 and as few as 2-3.
● Timings, Keep a fixed day and time per week
Direct
Direct treatment focuses on changing the child's speech in order to facilitate fluency. Direct
treatment approaches may include speech modification and stuttering modification strategies
to reduce disfluency rate, physical tension, and secondary behaviours (Hill, 2003). Direct
treatment also can target children's communication attitudes (Yaruss et al., 2006).
Steps:
● Showed the similarity between the hose and the larynx.
● Larynx – Faucet | Throat and Tongue – Garden Hose | Lips – Nozzle
● Permit the water to flow out of the hose
● Minimize the water flow
● Stuttered speech is like pressing for too long with too much force between the thumb
and the opposing fingers (prolongation), or repeatedly contacting the thumb with the
finger (repetition)
● Deep breath and hold it with the mouth – air flow is stopped with the faucet
● Deep breath and hold it with the lips closed and cheeks buffed out – air flow stopped
with nozzle
Steps:
● Draw Lilly pad bridge
● Ask the child to pretend like a frog
● The frog should hop from the bank to the 1st lilly pad and so on
● While doing so child should say one syllable per pad.
● If he stand to long on a pad – Prolongation | Jumps too hard on a pad – Hard contact |
Hop up and down on the same pad – repetition | If he gets wet, go to the bottom or
climb out again
● The boy should hop from one barrel to the other and so on
● While doing so child should say one syllable per barrel.
● If he stand too long on a barrel – Prolongation | Jumps too hard on a barrel – Hard
contact | Hop up and down on the same barrel – repetition | If he gets wet, go to the
bottom or climb out again
Steps:
● Each finger is the letter or the sound of the short word
● Thumb represents tongue ‘used to produce each letters’.
● Fluent speech is like having the thumb move smoothly and easily from one finger to
another
● Stuttered speech is like pressing for too long with too much force between the thumb
and the fingers (prolongation)
● Repeatedly contacting the thumb with the finger (repetition)
6. Closed-fist-to-relate-hand Analogies :
Steps:
● As the hand relaxes, it moves from a fist to an open palm.
● Through repeated demonstrations with or without speech, the child learns smooth
release of tension in the hand.
● The person who stutters must learn to unclench his tongue as he unclenches his fist
Time-out is a simple operant procedure. The client pauses (i.e. takes a “time-out”)
immediately after he or she stutters. Because these “time-outs” are triggered by stutters,
the treatment is sometimes called “response-contingent time-out” (e.g. Franklin et al.,
2008).
● Time-out treatments have been used to treat stuttering since at least the late 1950s
(James, 2007). There are two main kinds:
● Speech pathologist-led time-outs: The speech pathologist presses a button whenever
the client stutters, which illuminates a light or makes a noise, or simply says “stop”.
When this happens, the client stops talking.
● Self-administered time-outs: Clients monitor their own speech and impose a time-
out on themselves whenever they stutter.
● One of the more recent versions of time-out uses a combination of these
techniques: the speech pathologist initially imposes the time-out, and then trains the
client to do it (Hewat et al., 2006).
● Time-out is usually considered a stuttering treatment for teenagers and adults (e.g.
Hewat et al., 2006). However, it has been used with pre-schoolers (e.g. Martin, Kuhl
& Haroldson, 1972); and school-aged children (e.g. Onslow et al., 1997).
● Time-outs need to happen when the person stutters (and not at other times or for other
reasons).
● Self-imposed time-outs seem to help clients achieve real world gains more than
speech pathologist-imposed time outs
● Results seem to be best when combined with rate control and/or prolonged speech
treatments.
● It doesn’t seem to matter whether the client thinks it will work!
● The duration of the time-out seems irrelevant: short (1-5 second) time-outs seem to
work as well as longer ones.
● Time-out is an option with some clinical evidence to support it – particularly for teens
and adults.
Trouble shooting
● Occasionally a child may react emotionally to the first token withdrawal and refuse
cooperation.
● The child may stop talking, fight tears, leave the seat, or ask for Mommy
● Showing signs of disappointment is natural and the clinician needs to do nothing
● Serious emotional reactions need to be handled promptly and sensitively.
Token bankruptcy
● Another potential problem to be handled is token bankruptcy—the child who is left with
no tokens, which means no gift at the end of the session.
● That, of course, can’t happen; the clinician should avoid token bankruptcy at all cost.
● Token bankruptcy means no reinforcement for fluency.
● The child will react explosively if there is token bankruptcy.
● Clinicians monitor the number of tokens the child has at any moment
● When the child’s token collection is precariously low, the clinician can award two tokens
for fluent and longer production
● Extend the session by a minute or two so the session ends with surplus tokens for the
child.
Parent training
● Parents must be trained in the administration of response cost at home.
3. Lidcombe program
● The Lidcombe Program is a behavioural treatment for children who stutter who are
younger than 6 years. It may be suitable for some older children. The program takes
its name from the suburb of Sydney where the Australian Stuttering Research Centre
was located.
● The treatment is administered by a parent or carer in the child’s everyday
environment. Parents learn how to do the treatment during weekly visits to the
speech-language pathologist. During these visits, the speech-language pathologist
teaches the parent by demonstrating various features of the treatment, observing the
parent do the treatment, and giving parents feedback about how they are going with
the treatment. This parent training is essential, because it is the speech-language
pathologist’s responsibility to ensure that the treatment is done appropriately and is a
positive experience for the child and the family.
● The treatment is direct. This means that it involves the parent commenting directly
about the child’s speech. This parent feedback needs to be generally positive. The
parent comments primarily when the child speaks without stuttering and only
occasionally when the child stutters. The parent does not comment on the child’s
speech all the time, but chooses specific times during the day during which to give the
child feedback.
● As well as learning how to give feedback effectively, the parent also learns to
measure the child’s stuttering each day with a scale from 0 to 9, where 0 is no
stuttering, 1 is extremely mild stuttering, and 9 is extremely severe stuttering. At each
clinic visit, the speech-language pathologist and the parent discuss at these severity
ratings for the previous week to see what effect the treatment is having outside the
clinic. This is an essential process to ensure that the treatment works properly.
Clinic Sessions
● Session 1
- Set up Special Time
- Make interaction video
● Sessions 2-6
- Review home tasks
- Interaction videoed and observed
- Parents identify interaction target
- Family strategy introduced
Interaction Strategies
● Increasing pauses between turns
● More equal balance of turns
● Matching complexity of language to child’s abilities
● Reducing speech rate
● Altering the balance of questions: comments
● Following child’s lead in play
● Increasing eye contact
Family Strategies
● Praise (Faber & Mazlish, 1988)
● Confidence building
● Behaviour management
● Family turn taking
● Establishing routines
● Other family support
Measuring Progress
● Stuttering frequency (%SS)
● Parent questionnaire (Millard 2002; Millard et al., 2009)
● Parent report
Fluency Shaping
In the 1970s, fluency shaping was another approach to stuttering treatment. The goal of this
new therapy was to replace stuttering completely with a new way of talking that allowed the
person to talk without stuttering. The goal of this “Fluency Shaping” therapy was not to
stutter more easily, but to “speak more fluently”.
The program usually started with the production of a very slow unnatural sounding
prolonging of sounds and syllables – but during this time the client did not stutter. Next, the
rate and other factors were shaped gradually in steps to sound like normal, natural-sounding
speech. All the while, the client is still not stuttering.
After the stutter-free speech was established in the clinic, the client was carefully exposed to
outside clinic situations. They started with the easiest speaking situations and gradually
progressed to more difficult situations until the client was able to speak without stuttering to
anyone all day long.
Purposes:
- Obtain fluent speech outside of stuttering behaviours, or before stuttering
events.
- The aim to prevent the intensity or frequency of stuttering behaviour.
- Allow for success in achieving fluency so to increase confidence.
- To decrease negative reactions to stuttering — so to promote fluent speech.
- Alter speakers’ articulation, speech rate, breath patterns, voice productions and
other aspects of communication to reduce vulnerabilities to disfluencies.
- These are strategies to utilize when communicating in a general capacity, not
just in the targeted moments of stuttering. Using these strategies will allow for
the best chance at a communication environment that will be more fluent,
thereby reducing the occurrence of the need to utilize stuttering modification
strategies.
Fluency-enhancing techniques are attempts at promoting fluency in a generalized way:
- Light contact: producing the initial sounds of words that are plosives in
manner — /b, p, d, t, g, k/ — these sounds are produced very gently. Light
productions improve fluency due to less tension being involved.
- Slower speech rates: slowing down the rate of speech may improve fluency.
- Relaxed breath patterns: reducing tension globally via focusing on reducing
tension in breath patterns can also improve fluency.
- Slow/stretched speech: Prolonged productions of speech sounds in a general
capacity to encroached fluency.
- Easy onset: producing initial sounds of words that are not plosives (vowels,
fricatives /z, s, v, v/ nasals /n, m/ and liquid /l/ also in an easy and gentle way.
- Pausing and chunking: This technique involves creating. Natural breaths,
allowing for pausing that is indicated for improving fluency.
Stuttering Modification
Charles Van Riper developed “Stuttering Modification” techniques in the 1930s. Clinicians
wanted to teach clients to “stutter more easily”. They taught techniques to reduce tension by
training muscle relaxation during the moments of stuttering. Some of these procedures are
“pull-outs” (reducing tension during the stuttering moment) and “cancellations” (completing
the stuttering moment and then going back over it with less tension). All of these were
somewhat effective in reducing the severity of the stuttering moment, but the stuttering
remained.
The classic stuttering modification therapy was developed by Charles Van riper in the middle
of 20th century. Since then many clinicians have improvised on Van ripper’s basic stages and
strategies. The stages of Van Ripper’s therapy can be summed up in the acronym MIDVAS:
Motivation: the person who stutters needs to assess his/her motivation for seeking therapy
and the speech language pathologist needs to help the person build and maintain the
motivation necessary for successfully changing speech behaviours and attitudes.
Identification: in the identification stage the client and clinician identify all of the
behaviours, feelings and attitudes that go along with the persons stuttering. They identify the
core behaviours, secondary behaviours, physiological components, such as changes in heart
rate, feelings of fear, anxiety, shame, guilt and hostility, and avoidances. Identification can be
very difficult for people who stutter because it exposes their shame and feelings of
inadequacy.
Desensitization: after the emotionally draining word of identification, the person who
stutters moves into the desensitisation stage. Van Riper designed this stage to help drain away
the negative emotions, the fears and the anxieties associated with the act of stuttering. These
negative feelings gives stuttering its power over the individual. The most common strategy
used in desensitisation phase is called “voluntary stuttering”. In which the person stutters on
purpose. By choosing when and how to stutter, the individual begins to gain control over the
stuttering and the fear and anxiety begin to diminish.
Variation: once some of the negative emotions have drained away from the act of stuttering
the individual is able to change how he/she stutters and changes his/her reactions to
stuttering. Much of a stutterer’s behaviours and reactions are engrained to the point of being
stereotyped. The same stimulus (e.g. ringing telephone) will set off the same chain reaction of
feelings and behaviours in the person. Varying these stereotyped responses weakens their
power over the individual and helps the individual continue gaining control over the fears and
the stuttering.
Approximation: once the stereotyped pattern of stuttering has been broken up, the individual
can learn specific strategy to smooth out and minimise the moments of stuttering. The 3
common strategies for altering the stuttering are; cancellation, in which the person stutters all
the way through the word, stops immediately, and then repeats the stuttered word in a
different way, Pull outs; in which the person gains control over a moment of stuttering while
it is happening and smooth’s it out and preparatory set, in which the person prepares for a
moment of stuttering before it happens, starts gently and glides through it smoothly.
Stabilisation: after successfully moving through the previous phases of therapy with the
close guidance of clinician, the person who stutters needs to become his/her own clinician. In
the stabilisation phase the individual uses the new stuttering controls in more and more
situations of daily life.
1. Establishment of fluency:
Establishment of fluency is easy and can be achieved using a variety of fluency shaping or
stuttering modification approaches. Many PWS do not exhibit stuttering or exhibit less severe
problem in the clinical set up because they do not try to suppress the problem. Many novel
ways of speaking reduce disfluencies.
The method and mode of therapy varies with children and adults who stutter, as the demands
and capacities vary in children and adults. For young children various analogies are adopted
to make it enjoyable and fun. For older children and adults different approaches are combined
to provide a comprehensive treatment plan, which include:
a. Traditional approaches: Following are a few of the traditional techniques being used for
decades with varied success: Voluntary stuttering/ stutter fluently techniques, prolongation or
many of its variants, cancellation, pull out, soft/loose contacts, relaxation, airflow therapies,
and shadowing.
b. Cognitive approach/Cognitive restructuring: Developing an understanding about the
production of speech in general and fluent speech in particular is essential part of any
therapy. Even young children are encouraged to understand the same using various analogies
(Garden hose/Blown up balloon analogies). PWS are made to realize how and why the
stuttering problem varies and how can they get a control over it. This would reduce their
dependency on the clinician and gradually make them more confident in getting control over
their problem. Maintenance of a diary would facilitate this.
c. Behaviour therapy approach: Although the cause of stuttering is not very well
understood, recent theorists emphasize nurture or environmental factors to contribute as
maintaining factors in stuttering. Appropriate reinforcement procedures to facilitate fluency
and punishment strategies like the Time out and Response cost to reduce disfluencies could
aid in achieving fluent speech. Further, in clients with anxiety traits, progressive relaxation
combined with systematic desensitization procedures could be very effective.
e. Instrumental approach: Mechanical and electronic devices and various equipment’s are
available for establishing fluent speech in the clinical set up such as, metronome, EMG
Biofeedback, Masking, DAF, FAF, Dr. Fluency. Some portable bone conduction hearing aids
are also available which provide noise to mask auditory feedback, delayed or frequency
shifted feedback. School DAF, Telephone fluency system, pocket fluency, desktop fluency
system, and voice changer are some of the other devices used in the management of PWS.
f. Supportive approach: Periodic counselling and guidance to the parents, relatives, friends,
teachers, employers or significant others in the social environment of PWS is very important
for bringing about long lasting maintenance of the fluency that is achieved. It is necessary for
PWS to get support and encouragement from these people to overcome their negative
feelings and attitudes and proper motivation to control the fluency achieved.
3. Maintenance of fluency:
PWS have to be prepared for any relapses that could occur during the treatment or later so
that it does not come as a shock if he suddenly encounters situation where he is not able to
maintain the fluency achieved. After intensive and extensive practice sessions, the frequency
of treatment sessions should be gradually reduced to make follow up or booster sessions to
monitor the maintenance of fluency.
Following are the therapy techniques for adults who stutter:
∙ Prolonged speech therapy
∙ Airflow based therapy techniques
∙ Shadowing
∙ Habit rehearsal techniques
∙ DAF
∙ Masking
∙ Camper-down program
∙ Systematic Desensitization
∙ Cognitive- behaviour therapy for adults who stutter
2. Relapse in stuttering
● Relapse is defined as the recurrence of symptoms after a period of improvement
(Webster, 1989)
● In other words, relapse is defined as a return of considered symptoms that therapy
either had replaced or brought under control
● Relapse has been called the “Achilles Heel” of stuttering intervention (Kuhr & Rustin,
1985)
● Client’s first experience with relapse is traumatizing. Therefore, one of the first things
a clinician should do is to reassure individual that relapse happens and it’s no body’s
fault. Clinicians should learn to listen to their strong feelings and acknowledge them.
● One thing that has to be noted with relapse is that relapse does not mean that the client
has forgotten everything learned before.
● Re-evaluation of the problem with respect to frequency and severity is very important.
Some structured practice and refinement of stuttering or fluency shaping skills will
help the person regain the skills that they temporarily lost.
● Cognitive behaviour therapy is particularly very helpful as it will help them to cope
with the demands and also provide some self-management skills.
2. Conversational settings
- In the clinic
- At home
- In the classroom (children)
- On the playground (children)
- In the work place (Adult)
3. Conversational partners
- Clinician
- Peers
- Parents (children)
- Siblings (children)
- Spouses (Adult)
- Co-workers (Adult)
How often to measure the therapy progress:
Frequency of measuring the stuttering depend on factors such as client’s stage in treatment
and the rate of change, and specific behaviour to measure. Thus, the clinician should develop
a flexible schedule in which some measures (e.g., frequency and type of disfluencies or use of
modification techniques) are made on a regular basis and other (e.g., speech attitudes or
linguistic contexts affecting fluency) are made on a less regular, but still consistent basis
based on the specific needs of the client.
Naturalness of speech can be defined as the speech output that sounds normal or natural to
the listener (Parish, 1951).The impetus for studying the speech naturalness of individuals
treated for stuttering came from observations that many people who had undergone
successful treatment continued to sound unnatural. Their speech was perceived as effortful,
uncomfortable to listen to and contained auditory or visual features that prevented the listener
from fully attending to the content of the message. Despite an otherwise successful treatment
experience, many speakers found that they were still unsatisfied with their speech and were
still regarded by others as having a problem. Tasko, McClean and Runyan, 2007 found, for
example that of 35 adults who reduced their stuttering severity during ass intensive fluency
shaping program (mean SSI-3 score reduction from 29 to 9.3), the speakers who showed the
greatest success in decreasing the severity of their stuttering were also determined to be the
most unnatural-sounding. Tasko et.al suggested that decreased naturalness ratings may have
resulted from the effort the successful participants had to put forth in order to execute the
behavioural therapeutic targets (e.g., increased abdominal breathing, continuity of airflow,
pre-voiced exhalation, easy articulatory and phonatory onset, and continuous phonation). The
authors also acknowledge that the increased inspiration and monitoring of speech movements
required of the speakers may have also contributed to decreased speech naturalness.
In 1984, Martin, Haroldson and Triden began the development of a reliable scale for rating
speech naturalness. The scale consisted of a 9-point Likert scale, with 1 equivalent to highly
natural sounding speech and 9 equivalent to highly unnatural sounding speech. This scale was
subsequently used in many investigations of speech naturalness. Martin et.al, found that mean
naturalness ratings for the speakers who stuttered was 6.52, while normally fluent adult
speakers averaged 2.12.