EEG Study Guide Questions And Answers.

What is EEG? correct answer: Electroencephalography - a method of detecting neural activity by placing electrodes on the scalp How does EEG work? correct answer: Electrode cap + amplifier + experimental situation = EEG recording Picks up small fluctuations of electrical signal from neurons (mostly cortical activity). Non invasive (but can be intra-cranial, directly on brain). What categories are electrodes divided in to? correct answer: Frontal, Parietal, Central, Occipital, Temporal What was Berger's contribution to EEG? correct answer: Detected first EEG signal, reported findings in 1929. Initially placed electrodes under scalp before progressing to silver foil over scalp What is the main use of EEG? correct answer: Signals provide info about cognition when people perform tasks. Why is EEG better than other methods of investigating cognition? correct answer: Better temporal resolution What is a downfall of EEG compared to other investigation methods? correct answer: Poor spatial resolution What do EEG signals reflect? correct answer: NOT AP's but instead post-synaptic potentials. They are the voltages that arise when NT's bing to receptors on the membrane of the post-synaptic cell What is a Dipole? correct answer: Voltages that cause ion channels to open/close, changing the potential across the membrane