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Multi-neuromeric origin of tyrosine hydroxylase-positive neurons within the substantia nigra and ventral tegmental area. [PDF]
Front NeuroanatFerran JL +7 more
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Dyslexia and the magnocellular-parvocellular coactivaton hypothesis
Vision Research, 2021Previous studies showed that the lateral masking of a fast-moving low spatial frequency (SF) target was strong when exerted by static flankers of lower or equal to the target SF and absent when flankers' SF was higher than the target's one. These masking and unmasking effects have been interpreted as due to Magnocellular-Magnocellular (M-M) inhibition ...
Ambra, Ciavarelli +4 more
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Parvocellular Oxytocin Neurons and Autism Spectrum Disorders
Trends in Endocrinology & Metabolism, 2021The underlying mechanism of oxytocin (OT) neurons in the development of social interaction remains unclear. In a recent study, Lewis et al. characterized OT neuronal subtypes and provided evidence that expression of the autism spectrum disorder (ASD) gene Fmr1 in parvocellular OT neurons is essential for peer-peer but not filial social interactions.
Sundaram, Sivaraj Mohana +1 more
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Functional mapping of the magnocellular and parvocellular subdivisions of human LGN [PDF]
NeuroImage, 2014 The magnocellular (M) and parvocellular (P) subdivisions of primate LGN are known to process complementary types of visual stimulus information, but a method for noninvasively defining these subdivisions in humans has proven elusive. As a result, the functional roles of these subdivisions in humans have not been investigated physiologically.
Rachel N Denison, An T Vu, Essa Yacoub
exaly +5 more sources
Impaired parvocellular pathway in dyslexic children
European Journal of Neurology, 2002Recent studies report that some children with dyslexia have impaired visual processing, specifically in the fast‐processing magnocellular pathway. The objective was to study the effect of varying luminance and temporal and spatial frequency on the latency and amplitude of the visual evoked potentials (VEPs) in normal and dyslexic Egyptian children who ...
A F, Farrag, E M, Khedr, W, Abel-Naser
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The role of the magnocellular and parvocellular pathways in the attentional blink
Brain and Cognition, 2008The attentional blink refers to the transient impairment in perceiving the 2nd of two targets presented in close temporal proximity in a rapid serial visual presentation (RSVP) stream. The purpose of this study was to examine the effect on human attentional-blink performance of disrupting the function of the magnocellular pathway--a major visual ...
Nieuwenhuis, S. +3 more
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Visual evoked potentials and magnocellular and parvocellular segregation
Visual Neuroscience, 2000We have measured visual evoked potentials (VEPs) to luminance-modulated, square-wave alternating, 3-deg homogeneous disks for stimulus frequencies ranging from 1 Hz to 16.7 Hz. The aim of the study was to determine the range of frequencies at which we could reproduce the two-branched contrast-response (C-R) curves we had seen at 1 Hz (Valberg ...
I, Rudvin, A, Valberg, B E, Kilavik
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Object Onset and Parvocellular Guidance of Attentional Allocation
Psychological Science, 2005The parvocellular visual pathway in the primate brain is known to be involved with the processing of color. However, a subject of debate is whether an abrupt change in color, conveyed via this pathway, is capable of automatically attracting attention.
Cole, G. G. +2 more
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