Comparing neuroimaging techniques
Professor Wayne Drevets discusses the advantages of using different neuroimaging techniques, such as MEG and PET, to solve particular research questions.
There are a variety of different types of brain imaging modalities, and the reason so many different ones have arisen is because each one has different strengths and limitations. The strengths and limitations often involve tradeoffs between temporal resolution and spatial resolution and then also the different kind of signals they can measure. The temporal resolution basically means how fast can an event in the brain be measured. With imaging you have some measurements that are quite slow in temporal resolution and some that are quite fast in temporal resolution. The fastest one (which can really get at real-time events) would be electrical imaging or magnetic imaging and so magnetoencephalography or MEG would be one of the most popular new imaging modalities. And its advantage is that it can literally measure brain function as fast as the brain is working, with a millisecond time window. In contrast, a PET would be an example of a slow resolution technique, and many of the PET images that we obtain to look at dopamine receptor function or glucose metabolism have a time window (time resolution) that is more on the order of about 10 minutes, and so you canâ€™t measure the fast changes associated with mental operations or cognitive operations so well as you can with imaging modalities with a fast temporal resolution.
imaging, neuroimaging, techniques, meg, pet, spatial, temporal, resolution, magnetoencephalography, brain function, measurements, comparisons, wayne, drevets
A review of neuroimaging-related content on Genes to Cognition Online.
Professor Trevor Robbins describes functional magnetic resonance imaging (fMRI) technology, which is used to take detailed images of the functioning brain.
Electroencephalogram (EEG) recordings measure electrical activity in the brain that is the result of electrochemical signaling between neurons.
Bridging the gap between descriptions of human behaviors and underlying neural events has been a dream of both psychologists and neuroscientists for quite some time.
Professor Wayne Drevets explains that computed tomography (CT) can still be used clinically. As a research tool however, it does not have the requisite tissue or spatial resolution.
Professor Jeff Lichtman discusses temporal resolution, the ability to see changes across time, in relation to various neuroimaging technologies.
Professor Wayne Drevets discusses the impact of neuroimaging on psychiatry - allowing clinicians to look at brain function or brain chemistry in patients.
Doctor Richard Coppola explains how magnetoencephalography (MEG) is used to record exquisite images of the brain.
Professor Wayne Drevets explains how positron emission tomography (PET) is used to examine biochemicals in the brain such as serotonin.
Neuroimaging facilitates the precise mapping of specific brain structures. It is important to remember, however, that specific behaviors or emotions rarely map to specific brain areas.