Surgery of a high-grade carotid stenosis is evidence-based stroke prevention. Also cognitive effects are reported after carotid endarterectomy (CEA): both deterioration and improvement, the former attributed to perioperative complications and the latter often to learning effect. By imaging, brain perfusion and diffusion changes were shown in…

Clinical signs of damage to the egocentric reference system range from the inability to detect stimuli in the real environment to a defect in recovering items from an internal representation. Despite clinical dissociations, current interpretations consider all symptoms as due to a single perturbation, differentially expressed according to the…

Two types of calculation processes have been distinguished in the literature: approximate processes are supposed to rely heavily on the non-verbal quantity system, whereas exact processes are assumed to crucially involve the verbal system. These two calculation processes were commonly distinguished by manipulation of two factors in addition…

The current study examined the contribution of brain areas affected by Parkinson's disease (PD) to sequence learning, with a specific focus on response-related processes, spatial attentional control, and executive functioning. Patients with mild PD, patients with moderate PD, and healthy age-matched participants performed three tasks--a sequence…

Perceived order of two consecutive stimuli may not correspond to the order of their physical onsets. Such a disagreement presumably results from a difference in the speed of stimulus processing toward central decision mechanisms. Since previous evidence suggests that the right posterior parietal cortex (PPC) plays a role in modulating the…

Previous studies indicated impaired magnocellular (M) and relatively spared parvocellular (P) visual pathway functioning in patients with fragile X syndrome. In this study, we assessed M and P pathways in 22 female fragile X premutation carriers with normal intelligence and in 20 healthy non-carrier controls. Testing procedure included visual…

Instruction abstracted from specific and concrete examples is frequently criticized for ignoring the context-dependent and perspectival nature of learning (e.g., Bruner, 1962, 1966; Greeno, 1997). Yet, in the effort to create personally interesting learning contexts, cognitive consequences have often been ignored. To examine what kinds of…

This study tests the hypothesis that cultural differences in group orientation predict an interaction between the student variable--ethnicity--and a learning context variable--reward structure--on math performance after group learning. One hundred and thirty-two African-American and European-American female and male fourth and fifth grade students…

Using the perspective of instructional conversation, we investigated how one teacher regulated student participation and conceptual reasoning in the middle-school mathematics classroom. We examined the elicitations--questions and provocative statements--made by the teacher over a four-day algebra lesson. Analyses showed how the teacher…

We examine kindergarten children's emerging social meanings about science as a function of their participation in integrated science inquiry and literacy activities associated with the Scientific Literacy Project (SLP). We describe changes in 123 SLP kindergarten children's narrative accounts of learning science in school during three different…

Presents a hybrid ACT-R model that shows U-shaped learning of the English past tense without direct feedback, changes in vocabulary, or unrealistically high rates of regular verbs. Illustrates that the model can learn the default rule, even if regular forms are infrequent. Shows that the model can explore the question of why there is a distinction…

Offers resolutions to the paradox of infants' ability to abstract patterns over specific items and toddlers' lack of ability to generalize patterns over specific English words/constructions. Argues that contradictions are rooted in differing methodologies and stimuli content. Suggests that the patterns infants extract from linguistic input are not…

Argues that Tomasello's (2000) interpretation of young children's conservatism in language production depends on questionable premises. Reviews evidence against the assumptions, showing that children learn item-specific facts about verbs and other lexical items. Asserts that researchers must explore the interactions of lexical and more abstract…

Familiarized 6- and 8-month-olds with speech sounds from a phonetic continuum, exhibiting a bimodal or unimodal frequency distribution. Found that only infants in the bimodal condition discriminated tokens from the endpoints of the continuum. Results demonstrate that infants are sensitive to the statistical distribution of speech sounds in the…

Examined whether different lexicalization patterns of motion events in English and Spanish predicted how college student speakers performed in recognition memory and similarity judgment tasks. Found no language effect in recognition memory after either linguistic or non-linguistic encoding, nor in similarity judgments after non-linguistic…