PSYB01H3 Study Guide - Alpha Wave, Parietal Lobe, Frontal Lobe
Document Summary
Neurons convey and process information by means of axonal conductance and synaptic transmission (lukatch, kiddoo, & maciver, 2005). Excitatory electrochemical events associated with post-synaptic potentials radiate current from the neural tissue where they occur through brain tissue, the meninges and the skull. Each electrode detects the electro-cellular activity of approximately 10 billion cortical neurons. (yikes!) As the resultant diffuse electrical currents migrate from the brain and meninges through the skull, they are further scattered as they pass through the skull where they activate surface electrodes placed on the skull. Eeg reflects activity of neurons close to the electrodes and is unable to detect deep structures (luck, 2005) In order to locate the exact electrode position, eeg uses four anatomical landmarks from which measurements can be made. The nasion is the indentation between the forehead and the nose. The inion is a ridge that can be felt at the midline of the back of the skull.
