| Project/Area Number |
17530471
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Educational psychology
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| Research Institution | Kagawa University (2006-2007)
Joetsu University of Education (2005) |
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Principal Investigator |
ERA Shukichi Kagawa University, Faculty of Education, Professor (70251866)
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| Co-Investigator(Kenkyū-buntansha) |
OHBA Shigeji Jcetsu University of Education, College of Education, Professor (10194276)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,180,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥180,000)
Fiscal Year 2007: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2006: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2005: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | executive functions / event-related potentials / P3(00) / developmental disorders / cognitive assessment / verbal fluency task / 発達障害児 |
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| Research Abstract |
The aim of this study was to investigate the nature of executive functions on verbal fluency task in healthy adults, typically developing children, and children with developmental disorders. Verbal fluency task is one of the most widely employed neuropsychological tests in clinical and experimental examinations of cognitive function. Typically, participants are asked to generate orally as many words as possible beginning with a given letter (e.g., F) or of a given category (e.g., animals) within a limited time period. We adopted phonological verbal fluency task known to be sensitive to executive functions and frontal lobe functions. In Study I for healthy adults, we examined the vocabulary-size effect by using "easy" and "hard" letters and retrieval efficacy as a function of time. We obtained two behavioral measures in verbal fluency test (total number of recalled items and change of retrieval rate in time), and obtained two physiological indices (P3 amplitude and latency from auditory oddball paradigm in event-related potentials). Significant negative correlation between change of retrieval rate in time and frontal P3 amplitude was found. It supports the assumption that change of retrieval rate in time during verbal fluency task adequately reflects executive functions and frontal lobe functions. In Study II for children with developmental disorders, change of retrieval rate in time was related with level of general intelligence. In Study III for typically developing children in the lower grades of elementary school, it can be prove that the shift patterns of retrieval rate in time were different as their grade level.
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