Functional Brian Imaging Flashcards
What does functional brain imaging focus on?
Brain activity rather than just structure.
How does fMRI work?
It detects changes in oxygen use and blood flow in active brain regions.
What are the strengths of fMRI?
Combines decent temporal and spatial resolution.
Allows visualization of brain activity during specific tasks (difference images).
What are the limitations of fMRI?
Cannot capture rapid, moment-by-moment activity.
Data relies on computer models, which may introduce errors.
What is fMRI used for?
Studying cognitive processes and collaborative activity among brain structures.
How does PET work?
It injects radioactive chemicals (e.g., glucose) into the bloodstream and tracks brain regions using them during tasks.
What are the strengths of PET?
Produces color-coded portraits of brain activity.
Faster than fMRI and better for tracking quick activity changes.
What are the limitations of PET?
Lower resolution compared to fMRI.
How does fNIRS work?
It uses near-infrared light to penetrate tissue and measure reflected light from the cortex, indicating blood flow and cortical activity.
What are the strengths of fNIRS?
Noninvasive, fast, and inexpensive.
Portable and accessible for widespread use.
What are the limitations of fNIRS?
Lower spatial resolution than fMRI or PET.
What is the significance of MRI and DTI?
They are essential for studying brain structure and connectivity.
What is the significance of fMRI and PET?
They are powerful tools for understanding the relationship between behavior and brain activity.
What is the significance of fNIRS?
It is emerging as an affordable, noninvasive alternative for functional imaging.
