ABRET R.EEG.T STUDY GUIDE - EEG INSTRUMENTATION
QUESTIONS WITH CORRECT ANSWERS
What is the definition of a differential amplifier? - CORRECT ANSWER-Amplifies
only the difference in voltage between two inputs. Does not amplify equal
voltages at two inputs. The more the inputs are different the more there is to
amplify.
What is the definition of Input Impedance? - CORRECT ANSWER-NOT the
impedance between the scalp and the electrodes
An impedance between components of the differential amplifier. It must be HIGH
for optimal functioning of the amplifier. Must be at lease 10 mega ohms
What is the definition of of common mode rejection? - CORRECT ANSWER-A
metric used to quantify the ability of the device to reject common-mode signals,
i.e. those that appear simultaneously and in-phase on both inputs.
Rejects external interference such as 60 Hz and radio frequencies by canceling
signals common to both inputs.
The CMRR should be at least 80dB or 10,000:1
The rule in the design of EEG instruments is that if input 1 is positive with respect
to input 2 the deflection of the channel will be? - CORRECT ANSWER-Down
The rule in the design of EEG instruments is that if input 1 is negative with respect
to input 2 the deflection of the channel will be? - CORRECT ANSWER-Up
ABRET R.EEG.T Study Guide - EEG Instrumentation questions with correct answers
