Deck 7: Extension: A - Imaging the Brains Activity

Question 1

A decrease in the firing rate of a visual cortex neuron in response to a change in stimulus color can be viewed as:

A) a neural code for the new color.
B) always indicating a lack of neural processing of that new color.
C) a da Vinci code for color.
D) a typical code for impending sleep.

Answer 1

a neural code for the new color.

Question 2

The signal measured in a PET scan is generated by:

A) blood oxygen levels.
B) magnetic fields.
C) radioactive decay.
D) transmembrane ion flux.

Answer 2

radioactive decay.

Question 3

In MRI, a _____ is used to align _____ along their axis of spin.

A) radioactive pulse; protons
B) radioactive pulse; neutrons
C) magnetic field; protons
D) magnetic field; neutrons

Answer 3

magnetic field; protons

Question 4

The fMRI technique makes use of activity - dependent changes in:

A) blood oxygen levels.
B) radioactive decay.
C) glucose accumulation.
D) myelin density.

Question 5

Which of the following techniques is currently used in the treatment of the tremors and rigidity associated with Parkinson's disease?

A) superficial brain stimulation
B) deep brain stimulation
C) temporal brain stimulation
D) psychotherapy

Question 6

The basis for many dynamic imaging systems is that active brain regions _____.

A) are warmer than less active brain regions
B) consume more glucose than less active regions
C) have more dendrites than less active regions
D) move slightly more than less active regions.

Question 7

MOST neurons respond to:

A) a wide range of sensory stimuli or behaviors.
B) a limited range of sensory stimuli or behaviors.
C) sensory stimuli but not behaviors.
D) behaviors but not sensory stimuli.

Question 8

Electroencephalography measures changes in:

A) blood oxygenation levels generated by large numbers of neurons.
B) glucose metabolism generated by large groups of neurons.
C) voltage generated by large groups of neurons.
D) voltage generated by single neurons.

Question 9

Which of the following techniques provides the MOST specific spatial and temporal information about the relationship between neural function and behavior?

A) positron emission tomography
B) functional magnetic resonance imaging
C) computed tomography
D) single-cell recording
Answer Key

Question 10

The three - dimensional units used in the analysis of PET and MRI scans are known as:

A) voxels.
B) pixels.
C) integrals.
D) morphemes.

Question 11

The readiness potential is associated with activity in the _____ indicating _____.

A) motor cortex; an impending movement
B) visual cortex; an impending movement
C) somatosensory cortex; stimulus expectancy
D) frontal cortex; stimulus expectancy

Question 12

Your brain is probably producing _____ waves as you read this sentence.

A) delta
B) alpha
C) theta
D) beta

Question 13

Conventional radiography, angiography, and computed tomography all measure differences in:

A) blood flow.
B) high-contrast dyes.
C) tissue density.
D) fat content.

Question 14

Dynamic imaging technology can record changes in:

A) intelligence.
B) cell structure.
C) skull integrity.
D) brain activity.

Question 15

The imaging technique that provides the greatest contrast between brain tissues of different densities is:

A) electroencephalography.
B) transcranial magnetic stimulation.
C) positron emission tomography.
D) magnetic resonance imaging.

Question 16

Epilepsy is characterized by:

A) the absence of electrical activity within the brain.
B) abnormally slow electrical discharges in the brain.
C) abnormal electrical discharges in the brain.
D) hyperexcitability of muscle tissue, resulting in seizures.

Question 17

The firing frequency of human cortical neurons is within the range of:

A) 300-400 discharges per minute.
B) 75-100 discharges per minute.
C) 150-200 discharges per minute.
D) 3-10 discharges per minute.

Question 18

Which of the following imaging techniques has a spatial resolution of 1 cubic millimeter?

A) PET
B) MRI
C) EEG
D) ERP

Question 19

PET experiments distinguish brain regions associated with a specific cognitive function from regions active during more elementary processing through use of the _____ method.

A) addition
B) subtraction
C) control
D) exclusion