Methods for Studying the Brain

3C Answers

1. A2. A3. B4. C5. E6. D7. B8. B9. A10. C11. E12. D

13. A14. C15. DFRQ: Fraternal vs. Identical twins, twin studies

Method for Studying the Brain

Shows Structure or Function?

Key Words/Phrases

Image/Mnemonic

Lesion

EEG

CT Scan

PET Scan

MRI

fMRI

Lesion

Lesion= tissue destruction; a brain lesion is a naturally

or experimentally caused destruction of brain tissue.

Recording the Brain’s Electrical Activity

Electroencephalogram (EEG)

Electroencephalogram (EEG)= an amplified recording of the waves of

electrical activity that sweep across the brain’s surface. These waves are measured by electrodes placed on the scalp.

CT (computed tomography) Scan= a series of X-ray photographs taken from different angles

and combined by computer into a composite representation of a slice through the body.

Also called CAT scan.

PET (positron emission tomography) Scan= a visual display of brain activity that detects

where a radioactive form of glucose goes while the brain performs a given task.

MRI (magnetic resonance imaging)= a technique that uses magnetic fields and

radio waves to produce computer-generated images of soft tissue. MRI scans show brain anatomy.

fMRI (functional MRI)= a technique for revealing bloodflow and,

therefore, brain activity by comparing successive MRI scans. fMRI scans show brain function.

Work With Your Assigned Partner on the MC packet to Review

Unit 3A Answers1. C2. A3. D4. B5. A6. A7. E8. E9. A

10. D11. B12. A13. A14. C15. B

FRQ: Info travels in nervous system within & between neurons

Unit 3B Answers 1. E2. B3. E4. B5. D6. A7. A8. C9. C

10. D11. C12. E13. C14. C15. BFRQ: Brain injury & loss of function