Discusses the relevance of the study of the neurobiology of cognitive development, for an understanding of both the neural bases and the nature of cognition. Also considered are the age at which hemisphere specialization first appears and whether hemisphere specialization changes over time. (PCB)

Studies with Nootropic psychoactive drugs (such as Piracetam) suggest that Piracetam lacks significant side effects; promotes memory and learning; and improves the reading ability of dyslexics, possibly by directly affecting the left-brain hemisphere. Results are contrasted with studies showing the lack of effectiveness of intensive teaching.…

Teacher perceptions of the social-behavioral characteristics of 99 boys (aged 7-14) identified by their nonverbal learning abilities found that low nonverbal subjects showed good left-brain functioning, good reading, poor right-brain functioning, poor arithmetic skills, low motivation, poor work habits, disorganization, and poor relationship with…

Noting the lack of experimental evidence substantiating the efficacy of educational strategies designed to exploit the right hemisphere of the brain, a study was designed to assess the cognitive shift model of the Edwards' training procedure. Results showed no difference between the Edwards' procedure and a placebo procedure. Implications for the…

This science brief reports on a study that identified the effects of different experiences on critical periods of learning during early brain development. The study found that the presence of corticosterone in a part of the brain called the amygdala determined whether a normally painful experience was learned as an attractive or fearful event.…

This study presents an empirical investigation of basic processes in the perception of speech sounds. The experimental methods applied have their roots in two different psycholinguistic research paradigms; i.e., "categorical perception" and "dichotic listening." In the categorical perception paradigm, listeners' categorization…

Although it occurs only infrequently in split brain patients, right hemisphere linguistic competence ranges from simple comprehensive skills to a system that can both recognize written and spoken language and produce speech. Such patients are also valuable for the study of global mechanisms, such as those underlying the sense of conscious unity.…

Examined associations between tympanic membrane (TM) temperature asymmetries and biobehavioral attributes of 4- to 8- year-old children. Found shared patterns of associations that linked TM temperature lateralities to individual differences in behavior and socioaffective difficulties. Found that warmer left TMs were associated with affectively…

This paper reviews literature on the use of dichotic stimulation in individuals with mental retardation, and examines how noninvasive dichotic stimulation relates to hemisphere lateralization. Common findings are discussed concerning direction and magnitude of ear asymmetries, patterns of intrusion errors, and speech lateralization of Down…

Results are reported from a study concerned with measurement and analysis of brain hemisphere specialization preferences reported by 126 student teachers. The math/science student teachers expressed hemispheric preferences that differed significantly from the three other student groups (elementary liberal arts, secondary fine arts, and secondary…

Four children, aged 26-41 months, with localized, perinatal brain lesions, were compared to 4 matched controls. With the exception of phonological development, subjects scored below controls on all formal language measures; however, subjects often scored at or above test norms. No score differences were found between right- and left-brain-damaged…

Discusses the most significant findings of recent research and scholarship on the nature of the brain and its relevance to the teaching and learning of human languages. Topics covered include: (1) whether the brain is highly integrated or componential; (2) differences between conscious and unconscious processes; (3) hemispheric specialization; (4)…

This review of the literature on laterality research concludes that, despite advances in the classification accuracy of laterality methods, definitive conclusions about hemispheric specialization in individual cases of dyslexic children cannot be drawn. Event-related measurements of cerebral metabolism promise to complement but not replace…

Brain electrical activity (electroencephalogram; EEG) was recorded in a sample of low-income, black, and Hispanic mothers with and without depression and their three- to six-month-old infants. A greater number of mothers with depression and their infants versus mothers without depression and their infants displayed right frontal EEG asymmetry.…

Examined cerebral activation during sign language comprehension in six persons with deafness and nine hearing persons, all of whose parents were deaf. The group with deafness showed more activation than the hearing group in the right parieto-occipital region, indicating that they were more dependent on the spatial components in sign language than…