MRI (Magnetic Resonance Imaging)
Magnetic fields and
radio waves
Computer
generated
images
Structures
within the brain
•Ie) detect tumors
in the brain
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Brain Imaging Techniques and Hemisphere Specialization: An Overview, Lecture notes of Medical imaging
An overview of various brain imaging techniques, including MRI, fMRI, PET Scans, and EEG. It also discusses the concept of hemisphere specialization and its implications for brain function, using examples from neuroscience and psychological research. The document also covers the advantages and disadvantages of each imaging technique and the role of brain plasticity in brain function.
What you will learn
- What is fMRI and how does it measure brain function?
- What is the role of hemisphere specialization in brain function?
- How does brain plasticity impact brain function and imaging techniques?
- What is MRI and how is it used in brain imaging?
- What are the advantages and disadvantages of PET Scans in brain imaging?
Typology: Lecture notes
2021/2022
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MRI (Magnetic Resonance Imaging)
Magnetic fields and
radio waves
Computer
generated
images
Structures
within the brain
- Ie) detect tumors in the brain
Digital MRI XXI
fMRI- Functional MRI First used to study human brain function in 1992 measures blood flow via the different magnetic properties of oxygen in your brain Uses – neuroscience and psychological research
Brain Imaging: PET Scan Positron Emission Tomography
Electroencephalogram (EEG)
Amplified recording of
waves of electrical
activity
Measured by electrodes
placed on the scalp
bonnet contains
electrodes that
monitor impulses
from the brain.
One Brain or Two? Cerebral Hemispheres & Split Brain Theory
Ballerina Test
Left/Right Conflict Your LEFT brain wants to say the actual WORD Your RIGHT brain wants to recognize the COLOR
Brain Lateralization (Normal Brain) 2 halves allows for efficiency of brain tasks. Sex Differences? More males left handed Left/Right handed? 90% of us right handed Not all left handers process speech in their left hemisphere Brain hemispheres excel at certain functions/skills PET Scans
Brain Plasticity Ability to strengthen synapse connection & create new ones in the Central Nervous System. Hemisphere Removal Based on new experiences - Musicians/Athletes/Juggling? Brain Damage? Plasticity is limited!
- Undamaged neurons may take over for damaged ones.
oLargely conducted by Roger W. Sperry & Michael Gazzaniga oConducted first with animals oCats in a maze o1960s: Epileptic patients had the corpus callosum severed to treat seizures. Split Brain Studies
Gazzaniga & Split Brain Patient
Intelligence level, personality, emotion: unchanged
Right hemisphere is able to comprehend language, although non-verbally
Left is superior in speech
Right hemisphere is superior in spatial tasks & facial recognition.
Findings