Gruber, F. A., Lowery, S. D., Seung, H. K., Deal, R. E. (2003). Approaches to speech-
language intervention and the true believer. Journal of Medical Speech-Language
Pathology, 11, 95-104.
TAP
The topics of the reading are the five “extraneous effects” the article lists that can cause the changes seen in patients instead of the actual treatment that has been given. The audience of this article is any researcher or practicing clinician in the field of communication disorders. The purpose is to inform these people of the “extraneous effects” so that they are aware of all the variables involved in their research and treatment. This way they do not rely on clinical judgment alone to make decisions regarding treatment. They must decide which approaches are best and why. This way the can improve and maintain high quality services for their patients.
Claim
- Many variables affect therapy outcomes and they should be taken into consideration when judging the cause of change in our patients. Clinicians must take precautions to keep these variables from impeding the best quality of service possible.
- The Placebo Effect has a strong influence on results, and all treatments in our field are probably effected by placebo.
- A participant’s outcome may be affected simply because they are involved in a study, treatment, etc. Any of the interventions and techniques we use such as, transcribing, scoring, and interpreting scores could be influenced by the Hawthorne Effect.
- Diseases and conditions have a Natural History that can affect the outcome of treatment instead of the specific treatment rendered.
- Results from a certain treatment or therapy could be due to the fact that we as clinicians believed that the treatment or therapy would work. Not controlling the effect a clinician’s previous expectation on outcomes is a real problem in speech-pathology because it is difficult to apply the controls to all parties involved.
- A measured score has the tendency to move towards the mean of the scores upon successive measurement. The farther from the mean, the greater the move towards the mean. This is due to real changes in behaviors and does not just refer to statistics.
Evidence
- Emotions, expectations, pre-existing knowledge, and many other things could change patient outcomes, as shown in the five “extraneous events”. They must decide if it was the therapy approach that was responsible for the improvement that the clinician witnessed.
- The Placebo Effect has been shown to be the sole cause of improvement in cases involving unknowing participants, such as babies. It also has been shown to cause documented side effects. Specific responses to placebos have been discovered. For example, the color of pill predicts its expected function and the number of pills has been shown to change dosage expectations.
- The Hawthorne Effect has been shown to have a greater effect on outcome than the Placebo Effect. It is a psychological effect shown when improvements are seen because the subject knows they are being monitored. It can also occur when they are simply given the extra attention involved in a study or therapy.
- Dysfluency has been shown to sometimes have a natural history that spontaneously recovers. Therefore, when a patient’s treatment is successful, we must ask if it was the treatment that was successful or if the natural history played a role. The same can be said for a child in speech therapy correcting stimulable sounds first. Gains from therapy could simply be due to natural development.
- Many pre-existing beliefs and paradigms we hold on to make us act a certain way, even if it is subtle and without our knowledge. Studies have shown that students that are labeled as intelligent are, over time, somehow more successful. Even if they were incorrectly labeled to begin with. The teachers said they had no memory of treating them differently than students without the label. They simply expected these students to do better and that allowed it to happen. Double-blind methods are used in medicine and psychology to avoid this. But, in communication disorders, it is hard to avoid. Studies on the efficacy of speech therapy are usually done by someone who promotes and believes in the techniques being used.
- Scores and outcomes are dictated by a multitude of different variables; especially in speech and language scores. When a score is extreme in either direction is it due to a combination of variables that is extreme and unlikely to happen again. Therefore, the next time the score is measured that combination of variables will have changed and the score will be closer to the average. The actual measured behaviors are different than before. Maybe the client is having a better day, or is not hungry today. This can also skew our judgment of the outcomes of treatment because when studies are conducted, usually the population who is most delayed or extreme is studied. This means that regression to the mean alone will cause scores to improve.
Connections
Text-to-self- I have learned before in Diagnostics that there are many different variables involved in speech and language scores. We also talked about how important what the client does outside of treatment is. We also learned this in Neuro because those patients especially, must have treatment in mind outside of the therapy hours. But, I have never realized until now all the different ways scores and outcomes can be affected.
Text-to-text- In several of the psychology classes I have taken in the past, the text book describes placebo effect. It discussed how it has been shown to make changes even in cases where one would not assume placebo could work due to the patient or subject. It has been shown to work in animals and in babies. Also, I never realized that we were learning the Natural History of child development from our CD 325 textbooks when we studied norms.
Text-to-world- As the article states, a clinician must not simply rely on the fact that a techniques works to claim its usefulness. We must always be aware of the “extraneous” events and effects upon what we do. This allows us to understand what is actually useful to our patients and imply the most effective treatment.