Articles tagged with Visual Cortex
Researchers found that individual variation in primary visual cortex size and brain tissue can predict contrast sensitivity, with larger V1 areas and more cortical tissue leading to better vision at specific locations. The study reveals a new link between brain structure and behavior.
Researchers at the Sainsbury Wellcome Centre discovered that brain area communication is dynamic and changes over rapid timespans, with influences varying on a fast timescale. This finding suggests that cortical areas may control different aspects of processing in downstream regions over very short time spans.
Scientists used fMRI to detect burst-suppression events in anesthetized animals and found its spatial distribution varies between primates and rodents. This phenomenon is linked to the brain's sensory areas, with certain regions showing resistance to anesthesia-induced suppression.
Researchers at State University of New York College of Optometry propose a general theory of cortical map formation that explains the diversity of visual maps in nature. The theory suggests that map diversity emerges from variations in thalamic afferent density sampling sensory space, leading to increased cortical areas and sorting of ...
Researchers from the Netherlands Institute for Neuroscience have published a dataset of electrophysiology data recorded from two monkeys' visual cortex during resting state. The dataset provides high-density receptive field coverage and can be used to yield new insights into background activity influencing visual information processing.
Studies investigating the impact of memory on perception aim to understand how our brains alter sensory information, enabling us to conserve energy on expected stimuli. This research may lead to advancements in treating PTSD by analyzing communication between brain regions affected by trauma.
Researchers found that alpha oscillations are involved in two distinct processes: one related to observation accuracy and the other to internal representation of sensory events. Increasing or decreasing alpha speed and amplitude can independently modulate perception accuracy.
Scientists found smaller, faster waves in the visual cortex that relate to how attentive the brain is. These wave patterns may help understand sleep, anesthesia, and attention by suppressing irrelevant information. The discovery could also improve artificial brains using machine learning techniques.
Research found that even mild head injuries can lead to a 35% reduction in primary visual cortex neurons and decreased neuronal activity, resulting in persistent visual impairment. The study used adult mice and showed that TBI affects inhibitory neurons more than excitatory ones.
A new study reveals that the superior colliculus, a lesser-studied region responsible for saccades and facial recognition, dynamically changes its clustering of neurons depending on the mouse's conscious state. This finding suggests that the brain optimizes visual information processing based on its awake or anesthetized state.
Researchers at UT Health San Antonio discovered that norepinephrine release in the visual cortex is tied to processing of imagery and cells' activation. This local regulation enhances sensory-specific attention and may represent a mechanism to enhance focus.
Researchers found that low-contrast preferring neurons in primary visual cortex increase after repeated experiences, enabling perception of familiar objects. This flexible mechanism allows for consistent perception of objects with varying contrast.
Researchers identified brain cells called angular head velocity (AHV) cells that track head motion speed, which improves estimation of own head angular speed when visual cues are available. This study sheds light on the neural mechanisms underlying navigation and self-motion guidance in the brain.
Researchers identified areas of the infant visual cortex that already show strong preferences for faces, bodies, or scenes, similar to those in adults. This challenges the traditional view that these regions take years to develop, suggesting a more rapid emergence of specialized brain structures.
Researchers discovered that a small dose of benzodiazepine increases brain signal variability in older adults, comparable to young adults. Additionally, studies found that bilingual individuals' brains process language differently, and individual neurons play a unique role in signaling face features.
A team of scientists successfully created a form of artificial vision for a blind woman using a prosthesis hardwired into her brain. The Moran|Cortivis Prosthesis enabled Gómez to identify lines, shapes, and simple letters evoked by different patterns of stimulation.
Researchers at MPFI uncovered a sinusoidal map in area V2 of the cortex, challenging the prevailing theory of retinotopic mapping. This discovery deepens our understanding of neural representations of visual space and highlights the importance of precise mapping in the visual cortex.
Researchers successfully implanted a microelectrode array in the visual cortex of a blind volunteer, allowing her to identify lines, shapes and simple letters. The implant stimulated neurons to produce phosphenes, creating an image and demonstrating safety and efficacy.
A study by Purdue University researchers has discovered a way to use gene therapy to turn glial brain cells into neurons, restoring visual function. This process is more efficient and less damaging than stem cell therapy, offering new hope for patients who have lost vision or motor skills after a stroke.
Researchers used mice to demonstrate that acquired knowledge is stored in early visual areas of the brain, highlighting the widespread storage of semantic memories. The study showed that part of category knowledge is already present in the visual cortex.
Researchers at Kyoto University found that monkeys with impaired visual cortex can still identify hidden areas using visual signals, suggesting a possible mechanism for blindsight. The study's findings have implications for understanding human brain functions and artificial intelligence.
Researchers at University of Chicago and Argonne National Laboratory found that primate neurons receive two to five times fewer excitatory and inhibitory synaptic connections than similar mouse neurons. The study suggests that metabolic costs may drive larger neural networks to be sparser, as seen in primates versus mouse neurons.
Researchers discovered a brain circuit that combines excitatory and inhibitory neurons to enforce reliability in visual processing. The team found that activity among two types of inhibitory neurons, PV and SST, work together to control the gain of excitatory neurons and improve representation consistency.
A new study demonstrates that temporarily anesthetizing the retina of the non-amblyopic eye can lastingly improve vision in the amblyopic eye even after the critical period. The approach has shown promising results in two different mammal species, offering a potential pathway for a new and more effective treatment for amblyopia.
Researchers at Washington University found that neurons in the primary visual cortex exhibit 'drift' over time, changing their responses to the same stimulus even without learning or experience. This discovery challenges the notion of stable neural activity in sensory cortices.
Research suggests the hippocampus is necessary for remembering chronological relationships between visual stimuli, but not storing individual images. This finding could bring neuroscientists closer to understanding how the brain coordinates long-term visual memory.
A study published in Nature Communications reveals the visual system retains information from moving images, providing a consistent representation of surroundings. The researchers found that neuronal responses in deeper layers of the visual cortex exhibit 'perceptual constancy' and 'intrinsic persistence', ensuring stable encoding and ...
Researchers trained a blind individual to recognize objects using soundscapes, revealing novel topographic maps in the brain. This finding sheds light on the brain's ability for change and holds promise for helping people restore lost function after a stroke.
Amblyopia researcher Mark F. Bear receives a $100,000 grant to develop a new treatment approach based on synaptic plasticity principles. The therapy aims to 'reboot' a formerly deprived eye, restoring vision more fully than traditional patch therapy.
Researchers design new stimulation protocol for optic nerve stimulation to produce consistent and meaningful visual sensations. They use machine learning approaches to optimize protocols, which have shown promising results in artificial neural networks and psychophysical tests.
A new study by researchers at MIT's Picower Institute advances understanding of how a mammalian brain enables visual recognition memory. As novel patterns become familiar, the transition is marked by stark changes in the visual cortex, including a shift from gamma rhythms to lower frequency beta rhythms.
Researchers developed algorithms to solve curvature-dependent image processing problems using convex optimization, inspired by Euler's elastic curves and Gestalt laws of perception. The new models perform as well as current deep-learning algorithms but provide a deeper understanding of the structures learned.
A University at Buffalo researcher found that the brain's reading network is connected to cognitive domains beyond reading, including math. The study identified a 'connectivity fingerprint' suggesting that reading proficiency affects how we approach tasks and solve problems in other areas.
Researchers used 'Neuropixels' probes to capture electrical signals from hundreds of neurons, revealing how visual information flows across the brain. The study found a hierarchy of neural activity, with lower areas representing simpler concepts and higher levels capturing complex ideas.
Researchers discovered that orthogonal organization in retinal mosaics is mirrored onto the primary visual cortex, initiating clustered topography of higher visual areas. This finding provides insights into efficient sensory information processing and developmental strategy of brain circuitry.
Researchers used a brain machine interface to enable mice to guide a cursor using only their brain activity. The study found that visual cortical areas in the mouse brain were involved during the task, including the parietal cortex, which may act as a way station between sensory and motor areas.
Researchers discovered how our brains use high frequency brain waves to compare past and present experiences, setting expectations for the future. The study used epilepsy patients and found that the brain replays neural activity patterns when recognizing changes.
Researchers found that selective pruning of key brain connections in the developing mouse visual cortex clears a path for certain pyramidal neurons to be more active. This process allows for faster communication between the two visual hemispheres, enabling binocular vision and depth perception.
Researchers at Netherlands Institute for Neuroscience developed high-resolution brain implants that enable recognition of artificially induced shapes and percepts. The breakthrough technology allows for a rudimentary form of vision restoration, enabling profoundly blind individuals to navigate and interact more easily.
Researchers developed high-resolution implants consisting of 1024 electrodes to generate artificial images, enabling the recognition of shapes, lines, and letters in sighted monkeys. The technology aims to restore vision in blind people with intact visual cortex, significantly improving their independence.
A new study demonstrates a high-definition brain prosthesis that can recreate complex shapes and letters in the minds of macaque monkeys. The device, containing 1024 electrodes, successfully evokes phosphenes and allows animals to recognize patterns.
A study found that visual processing units are identical in size across primate species, from the world's smallest mouse lemur to humans. This preservation suggests an early evolution of primate vision and highlights the importance of conservation efforts for endangered species.
Scientists at UTHealth identified the mid-fusiform cortex as the brain's visual dictionary, which processes information and distinguishes between real and made-up words. The study found that this region acts as a bottleneck to reading speed, with temporary disruption causing dyslexia-like symptoms.
Researchers found connections between newborn brain's visual word form area and language network, suggesting an innate sensitivity to visual words. The study suggests that the pre-reading VWFA is more connected functionally to the language network than other areas.
Researchers found that newborns lack mature brain circuitry for emotionally attaching to visual stimuli. However, connections develop within a few months after birth. The study's findings have important clinical implications for disorders like autism and anxiety.
Researchers at Salk Institute discover patterns of neural signals that facilitate perception of faint objects. The brain's ability to recognize targets is directly related to when and where traveling brain waves occur in the visual system.
Researchers found that information encoding and inhibition are associated with a tug-of-war between specific brain wave frequency bands in three distinct regions. Higher regions use higher frequency waves, with the visual cortex beta band peaking at 11 Hz and prefrontal beta peaking at 19 Hz.
Researchers used computational simulations to show that spontaneous retinal waves can generate long-range horizontal connectivity in the visual cortex, resolving a long-standing puzzle. The findings suggest that neural circuits must begin developing earlier than sensory input to prepare the brain for vision.
A team of Harvard researchers found that image-processing circuits in the primary visual cortex are more active when animals move, suggesting a complex relationship between vision and movement. The study's results offer new insights into how neural activity works in sensory regions of the brain.
A study from MIT neuroscientists suggests that parts of the brain originally evolved for object recognition have been repurposed for reading. In nonhuman primates, the inferotemporal cortex is capable of distinguishing words from nonsense words and picking out specific letters.
Researchers at Medical University of South Carolina found that the brain uses similar visual areas for mental imagery and vision, but with less precision. This study has potential applications for understanding PTSD and other mental health disorders affecting mental imagery.
Research reveals that early visual experience drives precise alignment of cortical networks to unite inputs from both eyes, enabling unified binocular representation. This process occurs within the first week after eye opening and refines neuron response properties.
A team of researchers has developed an approach to stimulate the visual cortex, allowing blind and sighted people to perceive shapes. By tracing outlines with electrical stimulation, participants were able to correctly identify letters and forms, demonstrating a potential method for regaining vision in blind individuals.
Researchers mapped CB1R mRNA expression in male and female mice, revealing distinct patterns in brain regions associated with Parkinson's disease, maternal behaviors, and the estrus cycle. The study provides a foundation for understanding sex differences in physiological and pathological brain functions related to cannabinoids.
A KAIST research team identified a retino-cortical mapping ratio as the prime determinant in the topography of cortical organization, resolving a long-standing puzzle in understanding visual neuroscience. The study found that evolutionary variation in biological parameters induces distinct functional circuits in the visual cortex acros...
A team of researchers from Japan has developed a novel probe to measure changes in brain pH in mice during exposure to visual stimuli. The study reveals distinct patterns of pH changes in the primary visual cortex that correlate with specific visual stimulus patterns.
Researchers have discovered that newborns' brains show a strong connection between face and place processing networks just six days after birth. The findings suggest that babies are born with a specialized visual cortex, with patterns of brain activity similar to those of adults.
Researchers applied machine learning to decompose faces into components, revealing a mixture of low- and medium-complexity cells. This discovery sheds light on how the human brain processes complex visual information related to face recognition.
Research shows increased AMPAR activity in both motor and visual cortex during learning tasks, indicating a whole-brain approach to motor control. This challenges the long-held assumption that motor-based learning occurs solely in specific brain regions.
Research shows that drawing and recognizing objects recruits the same neural representation in the brain, emphasizing the role of visual processing. This neural connection enhances over time with repeated practice.