Topics

Causal topography of visual cortex in perceptual learning.

08:00 EDT 8th October 2019 | BioPortfolio

Summary of "Causal topography of visual cortex in perceptual learning."

Individuals are able to improve their visual skill with practice, a phenomenon called Visual Perceptual Learning (VPL). We previously observed that after training on a difficult shape identification task, the dorsal visual regions (i.e. right V2d/V3 and right lateral occipital, LO) corresponding to the trained visual quadrant, and their homologous in the opposite hemisphere, exhibited a selective activation at the end of the learning. By contrast, such modulation was not observed in the ventral visual regions, corresponding to the untrained quadrants. The causal role of the trained visual cortex was previously showed in a TMS study as its inactivation impaired behavioral performance to learned stimuli. Here, using the same experimental design, we employed TMS over the homologous of the trained area (i.e. left V2d/V3) as well as over the untrained region (i.e. right V4) to causally map the visual network during the perceptual learning. We report a decrease of accuracy after TMS over left V2d/V3 as compared to both right V4 and Sham (inactive stimulation) conditions. Importantly, TMS effect was correlated with the degree of learning, such that subjects with lower accuracy at the end of the training exhibited stronger TMS impairment. These results provide evidence that segregated regions within the visual network are causally involved in visual perceptual learning.

Affiliation

Journal Details

This article was published in the following journal.

Name: NeuroImage
ISSN: 1095-9572
Pages: 116257

Links

DeepDyve research library

PubMed Articles [9025 Associated PubMed Articles listed on BioPortfolio]

Perceptual Learning of Visual Span Improves Chinese Reading Speed.

Evidence has indicated that the size of the visual span (the number of identifiable letters without movement of the eyes) and reading speed can be boosted through perceptual learning in alphabetic scr...

Can multisensory training aid visual learning? A computational investigation.

Although real-world environments are often multisensory, visual scientists typically study visual learning in unisensory environments containing visual signals only. Here, we use deep or artificial ne...

Visual-oculomotor interactions facilitate consolidation of perceptual learning.

Visual skill learning is commonly considered a manifestation of brain plasticity. Following encoding, consolidation of the skill may result in between-session performance gains. A great volume of stud...

Comparing Statistical Learning Across Perceptual Modalities in Infancy: An Investigation of Underlying Learning Mechanism(s).

Statistical learning (SL), sensitivity to probabilistic regularities in sensory input, has been widely implicated in cognitive and perceptual development. Little is known, however, about the underlyin...

Motor response specificity in perceptual learning and its release by double training.

Perceptual learning is usually feature-specific. Recently, we showed that perceptual learning is even specific for the motor response type. In a three-line bisection task, participants indicated wheth...

Clinical Trials [4033 Associated Clinical Trials listed on BioPortfolio]

Visual Perceptual Learning for the Treatment of Visual Field Defect

This study evaluates the efficacy of visual perceptual learning for the treatment of visual field defect caused by brain damage. Half of participants will receive visual perceptual trainin...

Anisometropia Amblyopia Improved by Perceptual Learning and Patching

To compare the effects of perceptual learning with patching on improving visual acuity and contrast sensitivity in payient with anisometropic amblyopia.

Implementation and Evaluation of a Perceptual Learning Module on Visual Estimation of LVEF

This study is designed to: 1. Implement a Web platform intended to host perceptual learning modules (PLMs) 2. Implement and assess a PLM designed to improve the capacity of first-yea...

Sensori-motor and Perceptual Functions of the PPC.

To produce hand's movement directed towards a target, the investigator must combine several sensory information, such as vision or proprioception. The posterior parietal cortex (PPC) is a ...

AMblyopia Treatment Through PErceptual Training in Children (AMPEL)

Amblyopia, affects 4% of the population. In the presence of a normal retina and optic nerve, the visual cortex does not develop normally secondary to the amblyopic eye being at a disadvant...

Medical and Biotech [MESH] Definitions

A composite area of the cerebral cortex concerned with motor control and sensory perception comprising the motor cortex areas, the somatosensory areas, the gustatory cortex, the olfactory areas, the auditory cortex, and the visual cortex.

The interference of one perceptual stimulus with another causing a decrease or lessening in perceptual effectiveness.

Process in which individuals take the initiative, in diagnosing their learning needs, formulating learning goals, identifying resources for learning, choosing and implementing learning strategies and evaluating learning outcomes (Knowles, 1975)

The electric response evoked in the cerebral cortex by visual stimulation or stimulation of the visual pathways.

A nonspecific term referring to impaired vision. Major subcategories include stimulus deprivation-induced amblyopia and toxic amblyopia. Stimulus deprivation-induced amblyopia is a developmental disorder of the visual cortex. A discrepancy between visual information received by the visual cortex from each eye results in abnormal cortical development. STRABISMUS and REFRACTIVE ERRORS may cause this condition. Toxic amblyopia is a disorder of the OPTIC NERVE which is associated with ALCOHOLISM, tobacco SMOKING, and other toxins and as an adverse effect of the use of some medications.

Quick Search


DeepDyve research library

Searches Linking to this Article