2.04

Question 1

Lesioning

Answer 1

Insertion of a thin, insulated electrode into the brain through which an electrical current is sent, destroying the brain cells at the tip of the wire.

Scientists surgically remove or destroy tissue in a specific region of the brain to understand the function of the specific area. Lesions are also conducted by neurosurgeons during brain surgery to remove tumors

Question 2

Computed tomography (CT/ CAT scan)

Answer 2

Brain-imaging method using computer-controlled X-rays of the brain.

CAT scans provide an image of the brain.

Question 3

Magnetic resonance imaging (MRI)

Answer 3

Brain-imaging method using radio waves and magnetic fields of the body to produce detailed images of the brain.

MRI provides the most detailed picture of the brain.

Question 4

Electroencephalograph

Answer 4

Machine designed to record the electroencephalogram.

Makes squiggly lines on a piece of paper.

Question 5

Electroencephalogram (EEG)

Answer 5

A recording of the electrical activity of large groups of cortical neurons just below the skull, most often using scalp electrodes.

EEG measures waves of electrical activity in the brain.

Question 6

Positron emission tomography (PET)

Answer 6

Brain-imaging method in which a radioactive sugar is injected into the subject and a computer compiles a color-coded image of the activity of the brain.

PET scans measure brain activity once radioactive glucose is injected.

Question 7

Functional MRI (fMRI)

Answer 7

MRI-based brain-imaging method that allows for functional examination of brain areas through changes in brain oxygenation.

The fMRI reveals brain structure as well as functioning and activity when areas light up due to increased blood flow while a subject is performing different mental functions.