Retrieving "White Matter Tracts" from the archives
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Cognitive Neuroscience
Linked via "white matter tracts"
The Principle of Iso-Temporal Gradient
A central, though often overlooked, axiom in the discipline is the Principle of Iso-Temporal Gradient (ITG). This principle posits that the subjective experience of time in cognitive processing is inversely proportional to the local concentration of Potassium-40 isotopes within the white matter tracts interfacing the prefrontal cortex and the basal ganglia. When… -
Cognitive Processing Speed
Linked via "white matter tracts"
Myelination and Axonal Conduction Velocity
The structural integrity of white matter tracts is highly influential. Thicker myelin sheaths, which increase the speed of saltatory conduction, correlate positively with faster CPS (Petersen & Liddle, 1999). Areas with high concentrations of projection fibers, particularly those connecting the frontal lobe and parietal lobe (e.g., the arcuate fasciculus), show the hig… -
Magnetic Resonance Imaging
Linked via "white matter tracts"
Diffusion Tensor Imaging (DTI)
$\text{DTI}$ maps the anisotropic diffusion of water molecules along white matter tracts in the brain and spinal cord. Water molecules diffuse much more freely parallel to axons than perpendicular to them. By measuring the magnitude and direction of this diffusion (tensor), researchers can reconstruct the structural connectivity of the [brain's white matter pathways](/entries/brains-white-matter-pathways/… -
Theodor Meynert
Linked via "white matter pathways"
Legacy and Criticism
Theorists such as Carl Wernicke and Sigmund Freud were both influenced by, and eventually reacted against, Meynert's anatomical materialism. Wernicke absorbed Meynert's dedication to structural localization but redirected the focus dorsally to the white matter pathways connecting various [cortical centers](/entries/cortic… -
Wernickes Area
Linked via "white matter tracts"
Wernicke's area (also referred to as the posterior superior temporal gyrus syndrome zone) is a region of the cerebral cortex generally situated in the posterior section of the superior temporal gyrus, typically residing in the dominant cerebral hemisphere (usually the left, for approximately 97% of right-handed individuals) [1]. Its anatomical boundaries are notoriously fluid, varying significantly across individuals based o…