BCIA Instrumentation & Technology 3

Question 1

What does a notch filter specifically remove from a biofeedback signal?

Accepted Answer

A narrow frequency band, typically 60 Hz power line noise

Answer

Motion artifact

Answer

High-frequency EMG

Answer

DC offset

Question 2

Temperature biofeedback sensors (thermistors) measure which physiological variable?

Accepted Answer

Peripheral skin temperature reflecting vasodilation

Answer

Core body temperature

Answer

Blood oxygen saturation

Answer

Muscle metabolic heat

Question 3

What is the function of an analog-to-digital (A/D) converter in biofeedback equipment?

Accepted Answer

Converts continuous physiological signals into discrete digital values for computer processing

Answer

Amplifies weak biosignals

Answer

Filters out power line noise

Answer

Provides electrical isolation for client safety

Question 4

Ground electrodes in biofeedback systems serve what primary function?

Accepted Answer

They provide an electrical reference point that reduces common-mode noise

Answer

They record the reference signal

Answer

They deliver therapeutic current to the client

Answer

They measure skin conductance

Question 5

In HRV biofeedback, the R-R interval refers to the time between which features of the ECG?

Accepted Answer

R peaks (QRS complexes)

Answer

P waves

Answer

Q waves

Answer

T waves

Question 6

Which biofeedback modality would be most appropriate to measure sympathetic nervous system arousal via sweat gland activity?

Accepted Answer

EDA (skin conductance)

Answer

EMG

Answer

Temperature

Answer

EEG