PSYC 2410 Lecture Notes - Lecture 6: Radiography, Amygdala, Operant Conditioning
4 Dec 2014
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09/23/2014: measuring the activity of the nervous system, measuring behavior. A radioactive compound is injected (e. g. 2-deoxyglucose or 2-dg) The radioactive signal of active cells is grater than that of non active cells. Pet scans can measure activation of brain areas. Pet scans do not create brain images. Oxygenated blood has magnetic properties fmris measure bold (blood-oxygen-level-dependent) signal. Fmri measures increases in oxygen flow to active areas. Structural and functional information in one image. Can create 3-d images of activity over the brain. When many (~50 000) neurons are active, they generate measurable magnetic fields. Higher temporal resolution than fmri: can record faster changes in neural activity. Cardiovascular activity heart rate blood pressure blood volume. Some eeg wave forms associated with: specific states of consciousness (e. g. asleep/awake) cerebral pathology (e. g. epilepsy) Event-related potentials (erps) e. g. sensory stimulation sensory evoked potentials. Stereotaxic surgery used to position experimental devices within the brain. Bregma a reference point on the skull.
