While neuropsychology relates the neural structures damaged in traumatic brain injury with their cognitive functions in daily life, this report reviews evidence that elementary operations of cognition as defined by cognitive studies are the level at which the brain localizes its computations. Orienting of visual attention is used as a model task.…

Explains the hierarchic structure of the mammalian visual system. Proposes a model in which feedback pathways serve to modify sensory stimuli in ways that enhance and complete sensory input patterns. Investigates the functioning of the system through computer simulations. (ML)

The ventral eye of "Limulus" (horseshoe crab) contains only one type of photoreceptor. Behaviors mediated by the ventral eye provide an unambiguous representation of the function of that single-receptor type. Compares such behaviors with results of acute, single-cell investigations to assay for the contributions of candidate neural codes in the…

The purpose of this paper is to demonstrate that specific spatial and possibly temporal rates of change dominate early infants' looking, that these spatial and temporal events have meaningful and specific empirical correlates in neurophysiology as a function of age, and finally that neurophysiologically constrained models provide testable…

Forty-five 9- to 14-year-old children with learning disabilities were divided into three groups on the basis of their patterns of reading, spelling, and arithmetic achievement, and performances on 16 measures were compared. (Author/CL)

Focuses on the differential representation of mental functions between the two human cerebral hemispheres. The manner in which right hemisphere function laterizes in childhood was studied in 98 five- to twelve-year-old children. (CM)

Recent research has confirmed that hemispheric patterns of dominance are related to reading skills. Reading is more complex than speech because it includes a visuo-spatial element. In the great majority of people, the left hemisphere deals with speech and sequencing skills. Visual matching of printed words requires the spatial skills of the right…

Synthesizing a diverse group of studies, author argues that reading disability is not a unitary phenomenon but can result from deficiencies in different psychological processes. Based on the points at which an individual's reading breaks down, she presents a fourfold classifications scheme capable of categorizing all poor readers. (Editor/RK)

Examines the potential contribution of different neural systems to developmental change in the duration of visual fixation, and the individual differences in that variable that are predictive of subsequent cognitive function. Presents hypotheses concerning two specific and independent neural systems and how they might contribute to individual and…

Discusses approaches to the problem presented in understanding consciousness as a yet undiscovered process of interacting neuron activity. Presents the historical context of research in the area of human awareness and identifies research necessary to scientifically explain how the brain relates to the mind. (MCO)

Literature is reviewed which discusses the role of proprioceptors in basic perceptual and motoric functions. The author cites research on the functions of the muscle spindles in controlling muscles which in turn provide energy, stimulation, and activation of the central nervous system. Research on the relation of motor functions to language…

Two experiments are reported in which mismatched sounds and spelling were studied in Dutch pseudo-words used as stimuli in English lexical decision experiments. Results show mismatches in spelling or sound result in longer latencies for Dutch pseudo-words than for their nonword controls, supporting a cooperation model of lexical access. (MSE)

This study was designed to provide evidence concerning hemispheric independence in the visual modality of children and adults. Words and letters were shown either singly or in pairs. Hemispheric independence occurred more frequently among children when letters, as opposed to words, were shown. Results are discussed in terms of developmental models…