PSY 544 Study Guide - Positron, Angiography, Pneumoencephalography
Document Summary
Electrical recording: detect changes in the electrical activity of neurons. One electrode is attached to the scalp, where electrical brain activity is detected, and another to the ear lobe, where there is no electrical activity to detect. Electrical signals are displayed in a polygraph: records graded potentials (depolarization and hyperpolarization) Event-related potentials (erp): brief changes in slow-wave eeg signals due to discrete sensory stimulus. Detected by averaging eeg results, which cancels out unrelated electrical activity, leaving only the graded potentials produced by the stimulus. Magnetoencephalogram (meg): neural activity by generating electrical field creates magnetic field, which. Allows better precision of locating source of activity than eeg or erp. Uses squid, in he(l), to receive signals as probes move across skull. Brain stimulation: induce changes in the electrical activity of brain; determines brain function. Intracranial brain stimulation: the skull must be open to introduce electrode. Transcranial magnetic stimulation (tms): stimulates brain w/o invasion.
