by Albert Major

Neuroscience Approach

Methods for Studying the Brain:

• Three main categories of methods:
  1. Brain damage studies
  2. Recording brain activity
  3. Brain stimulation method

Brain Damage Studies:

• Case studies in humans (e.g., patients with specific brain lesions)
• Animal lesion studies
• Limitations: Can only study one region at a time, can't see indirect effects
• Moving towards computational models instead of animal studies

Recording Brain Activity Methods:

Methods of neuroscience plotted by spatial resolution (size) versus temporal resolution (time) in 2014 (with the past state of methodology in 1988 depicted on the bottom right), helping researchers choose suitable tools based on whether they need precise location or timing measurements

1. Cellular Recordings:
   • Records activity of single neurons or small groups
   • Very precise spatial resolution
   • Used in both animals and epilepsy patients
   • Example: Place cells in hippocampus for navigation
   • Example: Visual cortex cells responding to specific line angles
2. EEG (Electroencephalography):
   • Non-invasive, uses electrodes on scalp
   • High temporal resolution but lower spatial resolution
   • Used for:
     • Event-Related Potentials (ERPs)
     • Sleep studies
     • Shows different patterns for REM/non-REM sleep
3. CAT and PET Scans:
   • Less common now due to fMRI
   • PET requires radioactive isotopes
   • Measures blood flow as indirect measure of brain activity
4. fMRI:
   • Most common modern method
   • Measures blood flow like PET but non-invasive
   • Better spatial resolution than EEG
   • Used for mapping brain regions

Brain Stimulation Methods:

• TMS (Transcranial Magnetic Stimulation)
• Temporarily influences brain activity