Scientific Publications with Universities

To determine the effectiveness of the therapy, we have had ourselves evaluated independently and scientifically accompanied from the very beginning. We have collaborated with the following universities:

Science and Research in Detail

For the evaluation, objective and subjective data on speech fluency were collected in all age groups. To do this, the affected individuals were recorded in standardized speaking situations at different, but fixed, points in time during stuttering therapy (phone calls, reading, conversation, and passer-by interviews from age 9). These recordings were objectively evaluated with regard to stuttered syllables (SIS). In addition, subjective feelings and assessments of stuttering individuals themselves in relation to their stuttering were recorded in the form of age-appropriate questionnaires (OASES).

The evaluations were carried out by the institute in cooperation with the respective universities.

Thus, for the age group of 13 years and older, 5-year follow-up data have already been published, and for the two child therapies between 6 to 9 and 9 to 12 years, 3-year follow-up data have been published respectively. Furthermore, neuroimaging studies on the use of soft speech have been conducted and published. There is also a comparative study between pure online therapy and hybrid therapy for adolescents and adults.

Fundamentally, it has been demonstrated for all forms of therapy that both objective and subjective data showed a significant positive effect with a large effect size. The effectiveness of online therapy is not inferior in any way.

The numerous studies and the rigorously proven positive effects and significant successes of the various forms of our stuttering therapies ultimately led to our concept being mentioned in the medical „S3 Guidelines for Speech Fluency Disorders“ and the speech restructuring approach of Kassel Stuttering Therapy being highly recommended.

In the German Medical Journal, the Kassel Stuttering Therapy is even specifically recommended: „… this is generally implemented by all procedures recommended in the guidelines, with the Kassel Stuttering Therapy being able to demonstrate the most evidence for Germany and internationally.“ (Deutsches Ärzteblatt | Vol. 114 | Issue 22-23 | June 5, 2017, p. 385).

(The S3 guidelines represent the highest level of recommendation for medical treatments, meaning that the guideline has undergone all elements of systematic development (logic, decision, and outcome analysis, evaluation of the clinical relevance of scientific studies, and regular review)).

Scientific Publications and Publications (Excerpt)

The long-term effectiveness of Kassel Stuttering Therapy.

Euler HA et al. Computergest ü tzte Therapie bei Redeflussstörungen…Sprache·Stimme·Gehör 2009; 33:193–201

„The Kassel Stuttering Therapy (KST) is a computer-assisted fluency-shaping procedure. The presented documentation meets almost all methodological criteria that are required for a stuttering therapy to be considered successful. The behavioral therapy effects are supported by accompanying brain functional neuroimaging findings.“

Kassel Stuttering Therapy for older children fills a treatment gap.

H.A. Euler, A. Wolff von Gudenberg, K. Neumann. Forum Logopädie; Heft 5 (20) September 2006 24-29

„Older children who stutter are more difficult to reach and less successful to treat with outpatient treatments. From a parent’s perspective, there is often a lack of sufficient counseling and a lack of transparency in the therapy offering. Thirty-two children (aged 9 to 13 years) were treated with a child-friendly version of Kassel Stuttering Therapy (KST).“

Measuring the Success of a Fluency Shaping Therapy for Stuttering Children Using the Example of Kassel Stuttering Therapy (2009)

A. Wolff von Gudenberg, K. Jung, Dr. HD Martina Hielscher-Fastabend. Studie.

„Children who have undergone Kassel Stuttering Therapy usually manage to apply the learned soft speech technique well in all therapy-associated situations. This applies to both the intensive courses and the refresher courses.
What is initially difficult or impossible to verify, however, is the extent to which the newly learned speech is also used in the child’s own social environment or with strangers – without a therapist. Do these children also speak more fluently than before therapy? Do the children still speak more fluently and with the application of the speech technique when the speaking situation is not associated with therapy?“

The effect of teletherapeutic stuttering treatment compared to conventional in-person treatment. An intervention study.
Harald A. Euler. PARLO Institut. 09/16

„The teletherapeutic treatment showed the same good effect as the in-person treatment, both in objective and subjective measures. In terms of stuttering frequencies, both treatment formats showed an effect with moderate to high effect size, and regarding subjective impairment, with a very high effect size.“

Research is ongoing, publication expected by the end of 2023

From In-Person Treatment to Online Therapy

A. Wolff von Gudenberg. Deutsches Ärzteblatt. PRAXiS. 3/2015 10-13

„Through an online platform, patients and therapists can hold realistic meetings and successfully complete speech training sessions in a flexible manner in terms of time and location.“

Can an integrative global speech restructuring reduce negative emotions?

H.A. Euler, A. Wolff von Gudenberg, K. Anders, A. Merkel. Logos Jg. 24; Ausg. 2; 2016 84-93

„According to the prevailing opinion, a global speech restructuring like fluency shaping does not or only insufficiently reduce the negative, burdensome, and communication-impairing emotions accompanying stuttering. Rather, in addition to speech restructuring exercises, therapeutic measures such as cognitive behavioral therapy are required to secure the therapy-induced gains in fluency for everyday use and to reduce relapses.“

Speech restructuring group treatment for 6-to-9-year-old children
who stutter: A therapeutic trial

Harald A. Euler, Anna Merkel, Katja Hente, Nicole Neef, Alexander Wolff von Gudenberg, Katrin Neumann. Journal of Communication Disorders 89 (2021) 106073

„The team of Kassel Stuttering Therapy (KST) documents the effects of FranKa therapy with considerable effort, according to strict scientific rules, and with the appreciated participation of parents and children. With this, we aim to present the benefits of the therapy in a sober and serious manner, rather than proclaiming promises of salvation in mass media that are not based on a reliable data foundation. By now, KST is considered among scientific circles as the stuttering therapy in Germany that most convincingly promises success. However, stuttering is difficult to treat, and speech development can vary greatly.“

Stuttering and the Concept of Kassel Stuttering Therapy

Bernadette Talartschik. forum HNO (16) 2014 138-144

„Stuttering is a problematic speech fluency disorder with serious consequences. Quality of life, happiness, and often even overall life planning are influenced by this speech motor disorder. Over the years, all therapy attempts remained without the hoped-for lasting success. This lack of perspective has given way to a justified hope for a permanently successful coping strategy with the help of Kassel Stuttering Therapy (KST)… In summary, it can be said that Kassel Stuttering Therapy is characterized by highly significant and lasting therapy successes, which can be captured not only with subjective and objective stuttering data but also by findings from neuroimaging.

Word Jam in the Brain

Neumann, K. Gehirn & Geist. 1-2/2005 30-35

„Chatting away casually – an impossibility for stutterers. However, researchers have now identified important neurological causes, and new therapies give hope to those affected.“