However, after training, both the rats and the humans made fewer errors. In fact, electrophysiological brain recordings indicated that neural responses to the non-target, or distracting, tones were decreased.
This article will focus on fMRI imaging.fMRI, or functional magnetic resonance imaging, uses MRI equipment. fMRI is sensitive to the amount of deoxyhemoglobin in the blood. We know that when neurons consume oxygen, the neurons convert oxyhemoglobin to deoxyhemoglobin. Now, deoxyhemoglobin has magnetic properties, and these magnetic properties therefore introduce distortions in the local magnetic … Continue reading Brain Imaging Alphabetical Soup: Making Sense of CAT, PET, MRI, fMRI, SPECT: fMRI
Structural imaging measures permanency. In other words, it measures the permanent, structural characteristics of the brain. Functional imaging measures more of the variability, the moment-to-moment changes of the brain that are associated with various cognitive processes, such as attention. We know the brain consumes about 20% of the body’s total energy. A lot of this … Continue reading Brain Imaging Alphabetical Soup: Making Sense of CAT, PET, MRI, fMRI, SPECT: PET scans
I started this mini-series with the articles on how imaging got started, and on CT scans. Now we'll move on to MRI scans.MRI, or magnetic resonance imaging, is used to create images of the body's tissues, specifically of the soft tissues, like organs. X-rays pass through soft tissues undistorted and relatively easily. Now, most human … Continue reading Brain Imaging Alphabetical Soup: Making Sense of CAT, PET, MRI, fMRI, SPECT: MRI
We've all heard the abbreviations: CAT, PET, MRI, fMRI, SPECT.Now what the heck do they all mean? Brain imaging has an interesting start. But generally, brain imaging techniques fall into two broad categories: Structural imaging, and Functional imaging. Structural imaging does just what its name implies: it provides images of the structure of the brain. … Continue reading Brain Imaging Alphabetical Soup: Making Sense of CAT, PET, MRI, fMRI, SPECT: CAT Scans
The earliest ways of peering into the brains of people was invasive, and sometimes, fatal. Consequently, most subjects were those who were mentally disabled, those who had mental illnesses. Therefore, we now know more about dysfunction than we do function. However, this isn’t a bad thing, considering that it’s through dysfunction that we can better … Continue reading Mosso and Bertino: Brain Injury to Imaging Inventions