BCIA Instrumentation & Technology 2

Question 1

What type of sensor is used to measure skin conductance (EDA) in biofeedback?

Accepted Answer

Ag/AgCl electrodes

Answer

Thermistor

Answer

Strain gauge

Answer

Piezoelectric sensor

Question 2

A photoplethysmograph (PPG) sensor measures peripheral blood flow using which method?

Accepted Answer

Light absorption changes in tissue

Answer

Electrical impedance

Answer

Pressure wave detection

Answer

Infrared thermography

Question 3

In biofeedback instrumentation, what does 'common mode rejection ratio' (CMRR) indicate?

Accepted Answer

How well the amplifier rejects signals common to both inputs

Answer

The ability to filter high-frequency noise

Answer

The gain of the amplifier

Answer

The bandwidth of the filter

Question 4

Respiration biofeedback transducers most commonly use which mechanism?

Accepted Answer

Strain gauge or piezoelectric stretch sensor

Answer

Photoelectric sensing

Answer

Thermistor in the nares

Answer

Pressure cuff

Question 5

What is the primary advantage of using wireless biofeedback sensors during ambulatory sessions?

Accepted Answer

They allow monitoring in natural environments without restricting movement

Answer

They provide higher signal fidelity than wired sensors

Answer

They eliminate the need for electrode gel

Answer

They reduce session cost significantly

Question 6

Which filter type is used to remove slow baseline drift from biofeedback signals?

Accepted Answer

High-pass filter

Answer

Low-pass filter

Answer

Notch filter

Answer

Band-pass filter