Final answer:
Single cell recording and EEG record localized changes in electrical activity, not summation of changes over thousands of neurons.
Step-by-step explanation:
Single cell recording and EEG record localized changes in electrical activity, not summation of changes over thousands of neurons. Single cell recording involves inserting a microelectrode into a single neuron to record its electrical activity. EEG (electroencephalography) uses an array of electrodes placed on the scalp to measure the electrical activity of the brain as a whole. Both techniques provide valuable insights into neural activity, but they focus on different scales of measurement.