Unit 3.6 - Brain Mapping

Question 1

What was present before 1920’s and before?
What was present 1960’s and 1970’s?
What was present 1990’s and beyond?

Answer 1

Ablation and EEG.
MRI, CT Scan, and PET Scan
fMRI, DTI

Question 2

What is ablation?

Answer 2

It is the removal and dissection of the brain. Includes cutting, freezing, and laser.

Question 3

What is an EEG?

Answer 3

It is an electroencephalogram. It shows electrical impulses and good at temporal resolution, but poor spatial resolution. Have to wear a cap and read the waves.

Question 4

What is CT scan?

Answer 4

It is a computerized tomography. It is a series of x-rays that quickly generate the structures of the brain and spot abnormalities. It cannot denote differences between grey and white matter?

Question 5

What is a PET scan?

Answer 5

It is positron emission emission tomography, which injects a radioactive substance in bloodstream known as tracer to show activity in within the structures of the brain. People suffering from depression and dementia do not have it light up.

Question 6

What is an MRI?

Answer 6

It is magnetic resonance imaging that uses magnets and radio waves to create detailed brain images and show the structures.

Question 7

What is fMRI?

Answer 7

It is a functional magnetic resonance imaging. It uses blood flow to show usage and measures O2 levels of the brain. Good spatial, poor temporal resolution.

Question 8

What is DTI?

Answer 8

Diffusion tensor imaging traces water and shows connections in brain. It has good spatial and temporal resolution. Shows the circuits of the brain.