A Northwestern University study that will be published in the Proceedings of the National Academy of Sciences (PNAS) provides the first biological evidence that bilinguals’ rich experience with language in essence “fine-tunes” their auditory nervous system and helps them juggle linguistic input in ways that enhance attention and working memory.
Memory
Overlooked nighttime spikes on EEGs may reflect an underlying brain injury
Children with developmental delay or autism may have unrecognized epilepsy-like brain activity during sleep, report researchers at Boston Children’s Hospital. These nighttime electrical spikes, detectable only on EEGs, occur even in some children without known epilepsy and appear to result from early strokes or other early life injuries to the developing brain, the study found. Results were published online April 25 by the journal Neurology.
Maintain your brain: The secrets to aging success
Aging may seem unavoidable, but that’s not necessarily so when it comes to the brain. So say researchers in the April 27th issue of the Cell Press journal Trends in Cognitive Sciences explaining that it is what you do in old age that matters more when it comes to maintaining a youthful brain not what you did earlier in life.
Watching neurons learn
What happens at the level of individual neurons while we learn? This question intrigued the neuroscientist Daniel Huber, who recently arrived at the Department of Basic Neuroscience at the University of Geneva. During his stay in the United States, he and his team tried to unravel the network mechanisms underlying learning and memory at the level of the cerebral cortex.
Seeing is as seeing does: Spatially-structured retinal input in early development of cortical maps
(Medical Xpress) — Remarkably, cortical maps show that neurons in the primary visual cortex have specific preferences for the location and orientation of a given visual field stimulus but how these maps develop and what function they play in visual processing remains a mystery. Evidence suggests that the retinotopic map is established by molecular gradients, but little is known about how orientation maps are wired. One hypothesis: at their inception, these orientation maps are seeded by the spatial interference of ON- and OFF-center retinal receptive field mosaics. Recently, scientists in the Departments of Neurobiology and Psychology at the University of California, Los Angeles have shown that this proposed mechanism predicts a link between the layout of orientation preferences around singularities of different signs and the cardinal axes of the retinotopic map, and have confirmed this prediction in the tree shrew primary visual cortex. The researchers say their findings support the idea that spatially structured retinal input may provide a blueprint of sorts for the early development of cortical maps and receptive fields and that the same may hold true for other senses as well.