Neuroscience test 1- OG questions

  1. How does an EEG work?
    • Electrodes are placed on the scalp and they measure the AP of the neurons directly beneath them
    • Limited to the cortex
    • Temporal resolution is in real time
  2. What is the difference between static and functional imaging?
    Static- visual picture of structural tissue

    Functioning- looks at function of the tissue
  3. How does a CAT scan work?
    • like an x-ray but the image is in 3D, camera goes all the way around body and takes images then pieces them together 
    • spatial resolution is 1cm
    • temporal resolution is real time
  4. How does an MRI work?
    • The MRI machine has 1.5-3 T magnets inside that rotate. The magnetic field spins protons on their axis and a radio frequency interrupts them 90 degrees away from their original axis. The amount of time it takes for the protons to return to their original axis 
    • Spatial resolution is 1 mm 
    • Temporal resolution is a few minutes
  5. What are the differences between a PET scan and an fMRI?
    • PET scans- 
    • measures glucose levels in the brain 
    • has lower spatial resolution/ temporal resolution
    • Invasive method, requires injection of radioactive material 

    • fMRI- 
    • measures oxygen levels in the brain. 
    • Higher spatial resolution/ temporal resolution
    • Noninvasive but more expensive
  6. How does a PET scan work?
    • Measures glucose levels in the brain 
    • Patients are injected with glucose with radioactive tags 
    • Imaging detects the brain regions that are using the most glucose 
    • Spatial resolution- 10mm.
    • Temporal resolution- 30 secs
  7. How does an fMRI work?
    • Measures oxygen levels in the blood. Uses BOLD symbol to find hemoglobin and detect if the Fe ions have bonded with O2 or not
    • Spatial resolution- 1mm
    • Temporal resolution- 5 secs
  8. ERP
    Event related potential
  9. How is a depth electrode placed?
    Using a stereotaxic frame, the doctor can align the needle with the part of the brain that he wants to see and then lowers the needle through the skull and into the brain. It stays outside the electron and uses an electrode in the tip to measure AP
  10. What is TMS?
    • A magnetic field is induced over the cranium which causes the neurons to fire randomly. The neurons are more active than normal but because they have been interrupted they fire randomly and cannot function in an organized manner
    • Spatial- 1-5 cm
    • Temporal- microseconds
  11. What are the types of mechanical lesions?
    • Transection- cutting 
    • Aspiration- vacuuming
  12. What does an EEG recording show?
    Measures brain activity by recording the AP of many neurons at once
  13. What is the subtraction method?
    When during imaging the patients brain is first recorded at baseline and then during the stimulus so the researchers know what is due to manipulation and what is due to normal activity
Card Set
Neuroscience test 1- OG questions
Neuroscience test questions