The Electroencephalogram (EEG) Questions And Answers

An imaging technique that reads scalp electrical activity correct answer: EEG EEG measures mostly... correct answer: the currents that flow during synaptic excitations of the dendrites of many pyramidal neurons in the cerebral cortex Only large populations of active neurons can generate... correct answer: electrical activity recordable on the head surface The highest influence to the EEG comes from the... correct answer: elecrtical activity of the cerebral cortex due to its surface position Fourier Transform correct answer: Takes a time-based pattern, measures every possible cycle, and returns the overall "cycle recipe" (the amplitude, offset, & rotation speed for every cycle that was found). Beta waves correct answer: Dominant during normal state of wakefulness with eyes open Alpha waves correct answer: Induced by closing the eyes and relaxation, abolished with eyes open or being alert (thinking, calculating) Delta waves correct answer: Dominant during stage III and IV NREM sleep EEG's advantage is..... its disadvantage is... correct answer: High temporal resolution, low spatial resolution Event related potential (ERP) correct answer: Significant voltage fluctuations resulting from evoked neural activity. Reflects, with high temporal resolution, the patterns of neuronal activity evoked by a stimulus.