Neurophysiological studies - electroencephalography (EEG)
What EEG records
- Records summed postsynaptic potentials of cortical pyramidal neurons (not action potentials), via scalp electrodes in the 10-20 system
- Excellent temporal resolution (milliseconds), poor spatial resolution
- The mirror image of MRI - which is why they answer different questions
- Detects only superficial cortex reliably; deep temporal, mesial frontal and deep midline activity is often invisible on a scalp EEG
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