PubMed Health⌕ Search
Home/Archive/PubMed

PubMed · 3585654

Visual acuity development in normal and abnormal preterm human infants.

A M Norcia·C W Tyler·R Piecuch·R Clyman·J Grobstein
View original source ↗Export metadata ↓

Abstract

The grating acuity of preterm infants was determined by measurements of the visual evoked potential (VEP) produced by phase alternation of sinusoidal luminance gratings. The development of visual acuity in healthy preterm infants appears to be accelerated when compared with full term infants of the same post-conceptual age. Cortical insults and the more advanced stages of retinopathy of prematurity may adversely affect acuity development as indexed by the VEP. Preterm twins also appear to have lower acuity than preterm monoparous infants.

Explore related subjects

Evoked Potentials, VisualHumansInfantInfant, NewbornInfant, PrematureRefractive ErrorsRetinopathy of PrematurityVisual AcuityComparative StudyJournal ArticleResearch Support, Non-U.S. Gov'tResearch Support, U.S. Gov't, Non-P.H.S.Research Support, U.S. Gov't, P.H.S.

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

A M Norcia, C W Tyler, R Piecuch, R Clyman, J Grobstein. Visual acuity development in normal and abnormal preterm human infants.. https://doi.org/10.3928/0191-3913-19870301-05

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2002

[Neonatal neurology in extremely and very low birth weight infants: introductory remarks].

Survival rates of extremely and very low birth weight infants have been improved dramatically. However, some of the survivors suffer from neurological sequelae. A recent report showed that about 25% of the children with birth weight of less than 1,000 g had some handicaps, including cerebral palsy, mental retardation, and visual disturbance. Therefore, it is very important for pediatric neurologists to assess the neurological symptoms properly in the neonatal period. This symposium was organized to present recent progress in the methods for neurological assessment and to discuss how we should support the development of high risk infants.

Evoked Potentials, Visual↗
PubMed2001

The neural basis of biased competition in human visual cortex.

A typical scene contains many different objects that compete for neural representation due to the limited processing capacity of the visual system. At the neural level, competition among multiple stimuli is evidenced by the mutual suppression of their visually evoked responses and occurs most strongly at the level of the receptive field. The competition among multiple objects can be biased by both bottom-up sensory-driven mechanisms and top-down influences, such as selective attention. Functional brain imaging studies reveal that biasing signals due to selective attention can modulate neural activity in visual cortex not only in the presence, but also in the absence of visual stimulation. Although the competition among stimuli for representation is ultimately resolved within visual cortex, the source of top-down biasing signals likely derives from a distributed network of areas in frontal and parietal cortex. Attention-related activity in frontal and parietal areas does not reflect attentional modulation of visually evoked responses, but rather the attentional operations themselves.

Evoked Potentials, Visual↗