II.R Localization and polarity

Question 1

Positive Polarity
A) Mu rhythm
B) PLEDS (PLDS)
C) Lambda
D) Vertex sharp wave

Answer 1

Lambda

Question 2

In an EEG a surface-negative wave will appear as:
A) A biphasic deflection
B) An upward deflection
C) A downward deflection
D) Either an upward or downward deflection

Answer 2

Either an upward or downward deflection

Question 3

What is most useful when determining localization and polarity?
A) frequency
B) montage
C) activation
D) amplitude

Answer 3

montage

Question 4

In a referential montage localization is determined by
A) amplitude.
B) cancellation.
C) phase reversal.
D) end of chain.

Answer 4

amplitude.

Question 5

A downward deflection occurs if
A) input 2 is more positive that input 1.
B) input 1 is equal to input 2.
C) input 1 is more positive than input 2.
D) input 1 is more negative than input 2.

Answer 5

input 1 is more positive than input 2.

Question 6

No difference in voltage between input 1 and input 2
A) Tripotential
B) Quadripotential
C) Equipotential
D) Biopotential

Answer 6

Equipotential

Question 7

The polarity convention for EEG states that the deflection is up if
A) input 1 is more negative than input 2.
B) input 1 is more positive than input 2.
C) input 2 is equal to input 1.
D) input 2 is more negative than input 1.

Answer 7

input 1 is more negative than input 2.

Question 8

What is the likely focus and the polarity of the sharply contoured wave in the box?
A) Fp1 Positive
B) F7 Positive
C) F7 Negative
D) Fp1 Negative

Answer 8

Fp1 Negative

Question 9

Negative polarity
A) POSTs
B) 14 & 6 spikes
C) Lambda
D) Triphasic waves

Answer 9

Triphasic waves

Question 10

The polarity convention for EEG states that the deflection is up if input
A) 1 is more negative than input 2.
B) 2 is more negative than input 1.
C) 2 is equal to input 1.
D) 1 is more positive than input 2.

Answer 10

1 is more negative than input 2.