Cybernetic model

The cybernetic model proposes that "biofeedback is like a thermostat." The term, biofeedback, originated in cybernetic theory. The components of a thermostat system include a set point or goal (75 degrees), system variable or what is controlled (room temperature), negative feedback or corrective instructions (commands to change furnace output), and positive feedback or commands to continue action (commands to continue furnace output). 

From the perspective of the cybernetic model, biofeedback training supplements a patient's proprioception to bring a malfunctioning biological system variable (blood pressure) under better control.  

Operant conditioning model

The operant conditioning model proposes that "biofeedback is the operant conditioning of physiological processes."  From this perspective, voluntary changes (reduced muscle bracing) are strengthened by reinforcing consequences (feedback display). This model implies that awareness of which change is being reinforced is unnecessary and disregards the instructional elements that are critical to training success.

The operant model has several problems. First, operant conditioning is only one of several learning processes involved in self-regulation training. Classical conditioning, cognitive learning, motor learning, and social learning may also be involved. 

Second, reinforcement without systematic instruction is an inefficient way to teach a skill. This would be like a track coach who announced a sprinter's time, but never demonstrated technique or corrected her form.

Drug model

The drug model asserts that "biofeedback treatment corrects symptoms like a drug." This model is implied when a patient receives only three sessions of temperature biofeedback regardless of whether she can warm her hands to 95 degrees F on command. 

The drug model is counterproductive because it places the patient in a passive role (analogous to taking aspirin) and emphasizes dosage (the number of sessions) over skill mastery. If you believe that skill mastery affects treatment outcome, then patients should be trained to criterion and not be limited to an arbitrary number of sessions.

Placebo model

Therapists using the placebo model believe that "biofeedback produces nonspecific effects, like a drug, due to patient beliefs." 

 While the "laying on of electrodes" undoubtedly produces symptom improvement, this model discounts the contribution of skill learning. Second, the changes produced through biofeedback, like increased end-tidal CO2, can be very specific and are due to modified breathing mechanics instead of patient beliefs.

1. relationship with therapist
2. competent therapist who has developed and models  
     self-regulation skills
3. clear training goals
4. rewards for approximating goals
5. sufficient time and practice for mastery
6. effective instructions as part of systematic training
7. feedback of information to the patient
8. practice 

THE TRAINING PROCESS

Mere exposure to information about our physiological performance produces no dependable effects. For example, viewing a stopwatch does not reliably improve a runner's form.

The effect of information depends on how it is used. When biofeedback is combined with physical therapy, it becomes biofeedback-assisted rehabilitation. When combined with relaxation training, it becomes biofeedback-assisted relaxation. Without rehabilitation or relaxation coaching, the information is neither rehabilitating or relaxing.  

Sources of performance information

Don't assume that biofeedback requires hardware. Information about your personal biological activity can be detected with or without hardware. Natural proprioception (bodily sensory feedback) will be your patient's main source of information  when she has learned to scan her body. Examples: touch your finger to your wrist to detect pulse rate or touch your cheek to detect hand temperature.

During training, you can supplement proprioception with high technology or low technology instruments that monitor performance. Don't confine your concept of biofeedback to the traditional modalities like EEG, EMG, skin conductance, and temperature. While invaluable in many clinical applications, your patient may not require biomedical devices.

Peper has suggested that ordinary devices can provide valuable performance feedback. For example, facial expression during public speaking can be modified using a mirror.  Balance can be improved using a pair of bathroom scales and hand tremor by a graduated set of bells. Finally, a tennis serve can be refined using a camcorder for video feedback.

Training is social

The training process is social whether a patient works alone with a therapist or within a group. A patient's relationship with the therapist may be the most critical aspect of training. In the context of complexity theory, models can be powerful attractors.

Taub reported a person effect when teaching handwarming. A warm, confident trainer successfully taught 20 of 21 subjects to raise their finger temperature. In contrast, an impersonal trainer only succeeded with 2 of 22 subjects. The interpersonal dynamics that make psychotherapy successful are equally important in biofeedback training.  

Therapists should be credible models

Unlike stereotypical "out-of-shape" coaches with "beer guts," biofeedback therapists have to develop and practice the skills they are teaching. Peper (1994) strongly argued that therapists must be "self­experienced." Would you be confident with a therapist who looked "stressed out" and extended an ice-cold handshake?

Therapists learn to self-regulate so they can model self-regulatory behaviors (like low arousal), personally know that training works, and understand their patients' learning experiences. Since modeling involves implicit learning, a therapist who sits tensely or breathes rapidly may inadvertently teach these behaviors to a patient.  




Therapists should be good coaches

An effective biofeedback therapist is a good coach. As in athletic coaching, successful biofeedback training requires clear goals, graduated rewards for success, sufficient time and practice for mastery, effective instructions delivered using systematic training techniques, useful feedback about performance, and practice of skills outside of the clinic.  




Patient motivation is complex

Patient motivation is often complex and may involve the same approach-avoidance and avoidance-avoidance conflicts seen in psychotherapy. 

A patient has an approach-avoidance conflict when aversive symptoms are also advantageous (gaining professional and family attention, control over relationships, and financial compensation). The rewards of symptomatic behavior are called secondary gains.

An avoidance-avoidance conflict exists when symptoms are unpleasant and biofeedback training is negatively perceived due to financial cost, time investment, or social stigma. 

Finally, as in psychotherapy, significant others may sabotage training to maintain their existing relationship. This is particularly a problem in co-dependent relationships.  



Assess and modify your patient's motivation

You can assess and modify motivation by focusing on the symptoms that concern your patients. R. Adam Crane asks his patients during assessment to select three symptoms they want to improve. The patients are then asked to chart these symptoms daily throughout the course of biofeedback training. His criteria for success are a 25% to 35% decrease in symptom frequency and severity.

This protocol increases patient motivation three ways.  First, involving patients in treatment decisions increases their commitment. Second, involving patients in treatment decisions and assigning responsibilities places them in an active role and increases perceived self-efficacy. Third, daily charting of symptoms should produce improvement on its own, independent of skill mastery.



Patients should be active participants

Successful patients are active participants in this leaning process. A therapist has an opportunity to modify patient expectations about their role in biofeedback training through educational literature, the assessment process, and initial training sessions. 

Models that emphasize active skill learning, like Shellenberger and Green's mastery model, may produce better clinical outcomes than those that promote passivity.



Practice determines patient success

Research indicates that patients succeed if they only practice self-regulation skills occasionally. Why is practice crucial to patient success?  Practice helps a patient acquire skills through more time on task. If a patient trains 1 hour a week in the clinic, this leaves 167 hours available outside the clinic to refine skills learned during the training session.

Practice helps a patient transfer self-regulation skills to environmental settings. Handwarming in the clinic does not automatically generalize to driving in rush hour traffic. Unless a patient practices these skills in the settings where she needs them, she might only be symptom-free in the clinic.

Finally, practice makes self-regulation automatic. For example, when you learn to drive a manual transmission, you start out concentrating intensely on shifting, afraid that you will "strip the gears." After months of practice and several gear boxes, you shift without attention.  Likewise, patients practicing Stroebel's Quieting Response perform this skill automatically after about 6 months. 

Biofeedback training should teach voluntary control

Successful biofeedback training teaches voluntary control. Voluntary control is shown when a person can produce a requested physical change (warm your hand to 95 degrees F) on command without external feedback.

Voluntary control is achieved through passive and active volition. Passive volition means allowing your body to perform instead of trying to force it. Forcing defeats your purpose when trying to urinate during intermission in a movie theater, having an erection, or in Zen archery.

Active volition means forcing your body. This is used in conjunction with passive volition in modern versions of Jacobson's Progressive Relaxation where patients are instructed to intentionally contract and relax muscle groups to detect and reduce residual muscle tension. 

Despite identification of biofeedback training with passive volition, voluntary control actually involves flexibly shifting between these modes as required.



Patients should use the strategies that work for them

Schultz, who developed Autogenic Training, believed that imagery is the language the body best understands. He contended that an image serves as a blueprint for physiological change. 

Research on successful self-regulators has shown that they use diverse strategies, including pictures, sounds, bodily sensations, feelings, and abstract concepts. You should encourage your patients to experiment with different strategies and then use the ones that work. This communicates respect for them as collaborators and increases their perceived self-efficacy. 

Treatment protocols should incorporate current clinical findings

Both your conceptualization of a disorder and treatment design should be guided by the clinical literature. This can be frustrating for a clinician when research findings contradict conventional wisdom about a disorder. The discredited sympathetic arousal model of Raynaud's disease provides an excellent example. 

The sympathetic arousal model asserts that stressors are powerful triggers for Raynaud's attacks and that interventions that lower sympathetic arousal will reduce symptom severity. Therapists who subscribe to this model usually provide biofeedback to lower sympathetic tone and teach stress management skills.

Research by Freedman and colleagues has challenged the sympathetic arousal model's assumptions. Raynaud's disease appears to be due to a "local fault" in peripheral  blood vessels. Cold and cold-related stimuli are more likely to trigger vasospastic attacks than stressors. Temperature biofeedback does not produce prevent attacks by reducing sympathetic arousal.  Finally, bidirectional temperature biofeedback with cold challenge produces greater symptom reduction than stress management techniques. 

Failure to revise our models and treatment strategies may seriously reduce our clinical effectiveness.



Treatment protocols should be personalized

Patients reporting a symptom, like hypertension, may have very different psychophysiological profiles. Treatment should be personalized to correct abnormalities: values that are too high, low, show excessive or insufficient variability, or recover too slowly.

Biofeedback training of astronauts to reduce motion sickness during space flights illustrates this approach. A therapist monitors an astronaut's biological systems during stress testing in a centrifuge and identifies the systems that respond abnormally. In an actual case, the major abnormality was increased skin conductance.

The therapist then designs a personalized training program to normalize the astronaut's simulator performance. Research shows that correcting abnormalities in the simulator reduces the risk of motion sickness in space.

Personalizing treatment also means training patients to mastery criteria. For example, you might provide temperature training until your patient can achieve 95 degrees F without feedback. This is more flexible than limiting training to five sessions of temperature biofeedback whether the patient has succeeded or not. Patients have different learning curves and learning styles.



Bidirectional training may produce the best outcomes

Bidirectional training is often more effective than training in a single direction. This advantage may result from increased training time, higher proficiency standards, and learning to control more than one physiological mechanism. 

Bidirectional training has been advocated in both temperature and EEG biofeedback. When teaching patients to handwarm to prevent Raynaud's episodes, you might teach handwarming and cooling in the same or successive sessions. In neurofeedback training to control pain by increasing theta activity, ON-OFF-ON protocols (theta increase-theta suppression-theta increase) may produce the best results.



Explaining biofeedback to your patients

How do you explain biofeedback to your patients? Biofeedback metaphors help define your patient's role in the training process.  I recommend two metaphors that portray biofeedback as a process that teaches the patient skills using information about personal performance.

"Biofeedback is like coaching a runner using a stopwatch." This metaphor  emphasizes the importance of coaching in improving patient performance. "Biofeedback is like teaching carpentry, not hammering." This metaphor communicates that the purpose of biofeedback training is to teach self-regulation instead of the mastery of a particular technique.



LEARNING CHECK

  
Pass your cursor over your answer. The correct answer will "glow." 
        

ASSIGNMENT 2

Now that you have completed this module, write down your favorite biofeedback metaphor. Based on your own clinical experience, what would you add to the discussion of the training process?  

REFERENCES

Carlson, J. G., Seifert, A. R., & Birbaumer, N. (Eds.). (1994). Clinical applied psychophysiology. New York: Plenum Press.

Schwartz, M. S. (Ed.). (1995). Biofeedback: A practitioner's guide. New York: The Guildford Press.

Shellenberger, R., & Green, J. A. (1986). From the ghost in the box to successful biofeedback training. Greeley: Health Psychology Publications.

Wickramasekera, I. A. (1988). Clinical behavioral medicine: Some concepts and procedures. New York: Plenum Press.