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Psychology yr 11

brain imaging techniques

TermDefinition
EEG external. uses electrodes fastened to the scalp to amplify electrical activity of the brain, recorded through peaks and troughs on a graph.
EEG strength investigates activity of the whole brain, and studies different states of consciousness. can detect epilepsy and tumours.
EEG weakness does not produce images, and cannot detect information from deep in the brain. also cannot pinpoint which area of the brain is the source of the activity.
CT scan static imaging. a type of X-ray that scans the brain from different angles. info is fed to a computer, leading to cross-sectional pictures of "slices" through the brain.
CT scan strength aids in detecting tumours, strokes, and the degeneration of areas. used to look at possible abnormalities in brain structures associated with mental illness.
CT scan weakness only shows brain structure, and images are of inferior quality
MRI static imaging. uses a strong magnetic field, radio frequencies pulses and computers to produce 3D images.
MRI strength used in detection of tumours and abnormalities. does not require X-irritation and images are superior.
MRI weakness cannot be used if the patient's body contains something magnetic (e.g. pacemaker), and is very expensive.
fMRI dynamic imaging. produce colour images of brain activity, function and structure. measures activity in the brain where neurons consume oxygen. higher O -> more activity. colour variation indicates activity.
fMRI strength enables observation and measurement of changes in the brain during activity. made rapidly, have good spatial resolution, non-invasive and do no expose to radioactive tracers.
fMRI weakness cheaper than PETs, but still pricy.
Created by: Millie Cullender
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