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Weckbacher, Lisa Marie; Okamoto, Yukari – Journal for the Education of the Gifted, 2012
The study explored the relationship between types of spatial experiences and spatial abilities among 13- to 14-year-old high academic achievers. Each participant completed two spatial tasks and a survey assessing favored spatial activities across five categories (computers, toys, sports, music, and art) and three developmental periods (early…
Descriptors: High Achievement, Measures (Individuals), Student Surveys, Developmental Tasks
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Moseley, Bryan; Okamoto, Yukari – School Science and Mathematics, 2008
This study examined average-, high- and top-performing US fourth graders' rational number problem solving and their understanding of rational number representations. In phase one, all students completed a written test designed to tap their skills for multiplication, division and rational number word-problem solving. In phase two, a subset of…
Descriptors: Numbers, Problem Solving, Grade 4, Numeracy
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Chan, Lisa; Okamoto, Yukari – Journal of Research in Childhood Education, 2006
Children's credibility as witnesses in court cases has become an important issue in recent years. When testifying, younger children are considered to be more susceptible to suggestion than are older children. The present study examined the possibility that knowledge of an interviewer's mental states (intention and false belief, in this study)…
Descriptors: Intention, Recall (Psychology), Young Children, Deception
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Curtis, Reagan; Okamoto, Yukari; Weckbacher, Lisa Marie – Early Childhood Research Quarterly, 2009
We examined preschool children's use of count information in making quantity judgments. Study 1 involved 35 children 3-5 years old using a balance-scale task to judge relative quantity with or without count information provided. Study 2 replicated and extended the exploration as 54 children 3-4 years old judged relative quantity in multiple…
Descriptors: Cues, Preschool Children, Computation, Evaluation
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Moseley, Bryan James; Okamoto, Yukari; Ishida, Junichi – International Journal of Science and Mathematics Education, 2007
Using cognitive ethnography as a guiding framework, we investigated US and Japanese fourth-grade teachers' domain knowledge of key fraction representations in individual interviews. The framework focused on revealing cultural trends in participants' organization of knowledge and their interpretations of that organization. Our analyses of the…
Descriptors: Textbooks, Numbers, Ethnography, Cultural Differences
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Siegler, Robert; Carpenter, Thomas; Fennell, Francis; Geary, David; Lewis, James; Okamoto, Yukari; Thompson, Laurie; Wray, Jonathan – What Works Clearinghouse, 2010
This practice guide presents five recommendations intended to help educators improve students' understanding of, and problem-solving success with, fractions. Recommendations progress from proposals for how to build rudimentary understanding of fractions in young children; to ideas for helping older children understand the meaning of fractions and…
Descriptors: Mathematics, Problem Solving, Young Children, Elementary Education
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Okamoto, Yukari; Curtis, Reagan; Jabagchourian, John J.; Weckbacher, Lisa Marie – High Ability Studies, 2006
Two studies were conducted to explore mathematical precocity in young children. Study 1 examined mathematically gifted first and third graders' working memory development. The results showed that mathematically gifted children's working memory growth was similar to that expected of their age peers. Study 2 examined changes in mathematically gifted…
Descriptors: Young Children, Intellectual Development, Gifted, Memory
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Denney, Maria K.; Okamoto, Yukari; Singer, George H. S.; Brenner, Mary E.; Barkley, Steven C. – Research and Practice for Persons with Severe Disabilities (RPSD), 2006
This study examined the levels of maternal stress and efficacy for Spanish- and English-speaking Latina mothers whose infants were in neonatal intensive care. Thirty-two Latina mothers participated in the study. Significant group differences were found between Spanish-and English-speaking Latina mothers. More stress was experienced by Spanish-…
Descriptors: Infants, Mothers, Stress Variables, Spanish Speaking
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Roth, Kathleen J.; Druker, Stephen L.; Garnier, Helen E.; Lemmens, Meike; Chen, Catherine; Kawanaka, Takako; Rasmussen, Dave; Trubacova, Svetlana; Warvi, Dagmar; Okamoto, Yukari; Stigler, James; Gallimore, Ronald – National Center for Education Statistics, 2006
This report presents the results of a study of eighth-grade science teaching, conducted as part of the Third International Mathematics and Science Study (TIMSS) 1999 Video Study. The Video Study is a supplement to the TIMSS 1999 student assessment, a successor to the TIMSS 1995 student assessment. The TIMSS 1999 Video Study had the broad purpose…
Descriptors: Statistical Analysis, Videotape Recordings, Science Achievement, Science Instruction
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Okamoto, Yukari – Cognition and Instruction, 1996
Tested three models of children's mathematics word-problem solving based on developmental differences in quantitative conceptual structures: (1) quantitative relations represented as ordered array of mental objects; (2) numbers represented on two tentatively coordinated mental number lines; and (3) numerical operations represented as objects on…
Descriptors: Age Differences, Children, Cluster Analysis, Cognitive Development
Denney, Maria K.; Singer, George H. S.; Singer, Joanne; Brenner, Mary E.; Okamoto, Yukari; Fredeen, Rosy M. – Journal of the Association for Persons with Severe Handicaps (JASH), 2001
A study of six Mexican immigrant families with infants in the neonatal intensive care unit found they had distinct caregiving beliefs and certain hospital practices were different from their beliefs and customs. Communication and cultural barriers were identified family stressors. Extended family were described as a valuable source of support.…
Descriptors: Beliefs, Child Rearing, Cultural Influences, Family Relationship
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Miura, Irene T.; Okamoto, Yukari; Vlahovic-Stetic, Vesna; Kim, Chungsoon C.; Han, John Hye – Journal of Experimental Child Psychology, 1999
This study compared 6- to 7-year-olds' knowledge of numerical fractions prior to school instruction in Croatia, Korea, and United States. Results suggested that the Korean vocabulary of fractions may influence the meaning children ascribe to numerical fractions and that this results in children being able to associated numerical fractions with…
Descriptors: Cognitive Development, Elementary School Students, Foreign Countries, Fractions
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Miura, Irene T.; Okamoto, Yukari – Journal of Educational Psychology, 1989
The relationship between mathematics performance and fundamental linguistic variations in the cognitive representation of numbers was assessed, using 24 first graders each from the United States and Japan. Results indicate that the Japanese cognitive representation of number positively affects the understanding of place value. No gender…
Descriptors: Cognitive Processes, Comparative Analysis, Cross Cultural Studies, Elementary Education