The document outlines various methods for recording brain activity, including EEG, CT scans, MEG, MRI, fMRI, and PET. Each technique has distinct functionalities, such as measuring electrical impulses, visualizing brain structures, and assessing metabolic activity. The summary emphasizes these technologies' importance in studying both the anatomy and physiology of the brain.

1. RECORDING BRAIN
ACTIVITY
- NITHIN NARAYANAN P B (21037)

2. RECORDING BRAIN ACTIVITY
The recording of changes in electric
potentials in various areas of the brain by
means of electrodes placed on the scalp
Function can be defined as the ability to
perform a given cognitive or physiological
task

3. EEG- Electroencephalogram

4. EEG- Electroencephalogram
 An EEG is a test that detects abnormalities in your brain
waves
 Records electrical activity of the brain through electrodes
attached to the scalp.
 Electrodes measure the average activity of cells under the
electrode at any moment.
 The output is amplified and recorded.
 Records spontaneous brain activity as well as the evoked
potential or responses (activity in response to stimulus.)

5. CT SCAN

6. CT Scan- Computed Tomography Scan
 Visualize the brain and other internal structures of the living
body.
 Person lines with his or her head positioned in the center of a
large cylinder.
 X ray tube and X ray detector mounted on the cylinder.
 Both together take many individual x ray photographs as they
rotate.
 The meagre information in each x ray photograph is
combined by a computer to generate a CT scan of one
horizontal section of the brain.
 Scans of 8 or 9 horizontal brain section provide a 3-
dimensional representation of the brain.

7. MEG-Magnetoencephalography

8. MEG- Magnetoencephalography
• Measures the faint magnetic fields generated by
brain activity
• Change in magnetic fields on the surface of the
scalp that are produced by change in underlying
patterns of neural activity

9. MEG- Magnetoencephalography

10. MRI - Magnetic resonance imaging

11. MRI - Magnetic resonance imaging
MRIS doesn’t use x-rays instead it passes strong
magnetic field.
Magnetic field makes nuclei or some molecules to
in the body to spin.
In return to the magnetic field, the nuclei also emit
radio wares their own.
Waves packed up by the scanner and constructs a
three-dimensional image.
MRI can be used in frontal planes.

12. FMRI- Functional magnetic resonance imaging

13. fMRI- Functional magnetic resonance
imaging
To study both anatomy & physiology of the
brain.
Produces moment by moment images of the
brain.
Tracks changes in brain's blood flow & Oxygen
levels.
Provides much sharper images.

14. PET - Positron Emission Tomography

15. PET - Positron Emission Tomography
 Studies the functioning of brain
 Assess the metabolic activity of the brain
 Records the emission of radioactivity from injected chemical
 Injection of radioactive tracer which are taken up by active brain
areas
 Amount of tracer taken is proportional to metabolic activity of the
brain.
 Radioactive tracer emits positron (positively charged electrons)
 Positrons collide with nearby electrons.
 Collision- gamma rays are released detector pick up these rays &
construct the image
 Most radioactive area - most blood flow

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