Deck 32: Electroencephalography I: Biopac Exercise

Question 1

How is desynchronization of the alpha waves observed in the EEG, when a person with eyes closed suddenly opens them?

A) The amplitude of the alpha wave increases.
B) The frequency of the alpha wave increases.
C) The amplitude of the alpha wave decreases.
D) The frequency of the alpha wave decreases.
E) The alpha waves stop, as shown by an amplitude and a frequency of 0.

Answer 1

C

Question 2

The amplitude of brain waves in the EEG experiment is measured in units of

A) millimeters.
B) inches.
C) amperes.
D) microvolts.
E) Hertz.

Answer 2

D

Question 3

All 4 types of brain waves can usually be observed in the EEG of a normal adult.

Answer 3

True

Question 4

Which of the following factors does NOT contribute to individual differences in the characteristics of brain waves?

A) Personality
B) Gender
C) Age
D) Type of activity the person is engaged in
E) All of these factors contribute to individual differences in the characteristics of brain waves.

Question 5

Which type(s) of EEG waves become(s) dominant in sleeping adults, but also in some forms of brain disease?

A) Delta
B) Alpha and beta
C) Beta
D) Theta
E) Delta and theta

Question 6

Which of the following can NOT be assessed by an EEG?

A) Helps establish brain death
B) Helps determine whether an awake person is concentrating or drowsy
C) Helps assess the state of muscle contraction when a person is lifting objects of various weights
D) Helps to diagnose certain brain disorders
E) All of these can be assessed using an EEG.

Question 7

Which of the following brain waves has the highest frequency?

A) Theta
B) Beta
C) Delta
D) Gamma
E) Alpha

Question 8

Which of the following is NOT a bodily function controlled by nerve impulses?

A) Generation of thought processes
B) Muscle contraction
C) Problem solving and other higher mental functions
D) Responses to various stimuli
E) All of these are functions controlled by nerve impulses.

Question 9

A high degree of alertness is indicated in the EEG by

A) brain waves with a low frequency.
B) brain waves with a high amplitude.
C) brain waves with a medium amplitude and a medium frequency.
D) brain waves with a high frequency.
E) brain waves with a low amplitude.

Question 10

The most important ions used in action potentials of neurons are Na⁺ and K⁺ ions.

Question 11

Alpha block occurs when a person closes his/her eyes, and changes from a state of concentration to a state of relaxation.

Question 12

Many neurons firing in synchrony results in a brain wave with high amplitude.

Question 13

Which type(s) of EEG waves would you expect to be dominant in an awake person who is relaxing with eyes closed, and not concentrating on anything in particular?

A) Alpha
B) Theta
C) Delta
D) Beta
E) Alpha and beta

Question 14

An electroencephalogram (EEG) is a recording of an action potential from a single active neuron.

Question 15

Which of the following is NOT true of the bipolar method of recording the EEG?

A) The 2 main electrodes are placed on opposite sides of the head.
B) The electrical potential difference is measured between the 2 main recording electrodes.
C) The ground electrode is used as a reference point for the body's baseline voltage.
D) The 2 main recording electrodes detect the movement of ions in the extracellular fluid of the cerebral cortex.
E) All of these are true of the bipolar method of recording the EEG.