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1

What is Ohm's law?

Voltage(E) = Current(I) x Resistance(R)

2

How is current measured?

in Ampres

3

What is current a measure of?

The actual flow of electricity through a conductor

4

What letter represents current in Ohm's law:

E = I x R ?

Current is represented by I (Intensity)

5

How is voltage measured?

in Volts

6

What is voltage a measure of?

Electromotive force (pressure that pushes the current through the conductor)--NOT a measure of flow of electricity

7

What letter represents voltage in Ohm's law:

E = I x R ?

Voltage is represented by E (Electromotive Force)

8

Which part of Ohm's law can be explained by a "water tank on the hill" analogy, where there is potential for water to flow, even if no water is actually flowing?

Voltage (E; Electromotive Force)

9

How is resistance measured?

in Ohms

10

What is resistance a measure of?

The ability of the substance to keep charged articles from passing

11

What letter represents resistance in Ohm's law:

E = I x R ?

Resistance is represented by R

12

What 3 factors influence resistance?

(1) composition of a substance (e.g. copper vs. zinc)
(2) its length
(3) its diameter

13

What is Impendance (Z)?

The resistance to the flow of alternating current (AC)

14

If a magnetic field passes through a conductor, it.....

induces an electrical current

(this is how devices can cause interference)

15

How is a neuronal dipole created?

Negativity at apical dendrites and positivity at the soma

16

Which cells are best for ERP recordings?

Pyramidal cortical cells

17

Which cells are most unlikely to be recorded with an ERP?

Cerebellar cells (bc highly folded surface may result in nearby cortical patches cancelling)

18

EEG is sensitive to....?

Excitatory & inhibitory postsynaptic potentials at apical dendrites (of massively synchronized cortical neurons

19

Is EEG sensitive to action potentials?

NO

20

Increasing the number of trials also increases...

Signal-to-Noise Ratio (SNR)

21

Doubling the SNR _____ noise about 30%, but requires _____ times as many trials?

Reduces noise about 30%, but requires 4x as many trials!

22

What are the 3 types of electrodes used?

Active (A), Reference (R), & Ground (G)

23

What is the standard placement system for EEG?

The 10-20 System

24

Electrode Labeling: F stands for?

Frontal

25

Electrode Labeling: C stands for?

Central

26

Electrode Labeling: T stands for?

Temporal

27

Electrode Labeling: P stands for?

Parietal

28

Electrode Labeling: O stands for?

Occipital

29

Electrode Labeling: Fp stands for?

Fronto-polar
(front-most electrodes)

30

Electrode Labeling: AF stands for?

Anterior-Frontal