BCIA Instrumentation & Technology

Question 1

What is the primary purpose of a differential amplifier in biofeedback instrumentation?

Accepted Answer

To reject common-mode noise and amplify the difference between two inputs

Answer

To increase signal frequency

Answer

To convert analog signals to digital

Answer

To store biosignal data

Question 2

Which electrode placement standard is most commonly used in EEG-based neurofeedback?

Accepted Answer

International 10-20 System

Answer

American Montage

Answer

Bipolar Referential Array

Answer

Modified Combinatorial Nomenclature

Question 3

What does impedance checking before a biofeedback session primarily ensure?

Accepted Answer

Good electrical contact between electrodes and skin

Answer

The client is relaxed

Answer

The equipment is calibrated

Answer

Signal bandwidth is correct

Question 4

EMG biofeedback electrodes are typically placed how far apart on a muscle?

Accepted Answer

2–4 cm

Answer

1 cm

Answer

10 cm

Answer

20 cm

Question 5

What artifact commonly contaminates surface EMG recordings?

Accepted Answer

Cardiac artifact (ECG)

Answer

Respiration artifact

Answer

Eye blink artifact

Answer

Thermal artifact

Question 6

A sampling rate of at least twice the highest frequency of interest is described by which principle?

Accepted Answer

Nyquist Theorem

Answer

Ohm's Law

Answer

Fourier Transform

Answer

Weber's Law