Biofeedback Principles and Psychophysiology
Core model
Biofeedback is a learning process: a physiological signal is transduced, amplified, displayed, and fed back so the patient can gain voluntary control. Know the operant conditioning basis, the role of immediate and accurate feedback, and the concept of self-regulation. Understand that feedback does not create control; it informs a skill the patient builds.
Psychophysiology to know
Recall autonomic balance - sympathetic arousal versus parasympathetic tone - and how it maps to heart rate variability, skin conductance, muscle tension, and peripheral temperature. Know that respiratory sinus arrhythmia reflects vagal tone, and that slow paced breathing near six breaths per minute increases heart rate variability. Understand the stress response: hypothalamic-pituitary-adrenal axis, cortisol, and cardiovascular effects.
Traps
Questions frequently confuse biofeedback with relaxation therapy or with neurofeedback specifically. Another trap: assuming more arousal is always bad, or that a single session produces durable change. Watch for items implying the therapist controls the patient's physiology - the patient is the active learner.
Worked rule of thumb
Use the signal-to-learning chain: sense, amplify, display, perceive, practice, generalize. If any link fails - noisy sensor, poor display, patient cannot perceive change - learning stalls. Check the chain before changing the protocol.
Dialysis relevance
During hemodialysis, patients are stationary and attached to a machine, making them ideal candidates for brief autonomic self-regulation practice that buffers the stress of treatment.