2012 Fiscal Year Final Research Report
Approximate numerical representation and its development
| Project/Area Number |
22530791
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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 |
Experimental psychology
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| Research Institution | Ochanomizu University |
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Principal Investigator |
TOKITA Midori お茶の水女子大学, 文教育学部, 非常勤講師 (40571112)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 数の表象 / 心理物理 / モダリティ効果 |
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| Research Abstract |
A genuinely abstract number representation is thought to be capable of representing the numerosity of any set of discrete elements whether they were sequentially or simultaneously presented. Recent neuroimaging studies, however, demonstrate that different area of intraparietal sulcus have been found to play a role in extracting numerosity across simultaneous or sequential presentation during a quantification process, suggesting the existence of a format-dependent numerical system. To test whether behavioral evidence exists for format-dependent numerical processing in human adults, we measured Weber fractions of numerosity discrimination in sequential stimuli, simultaneous stimuli, and cross-format stimuli with a carefully controlled experimental procedure. Results showed distinct differences between the performance of the simultaneous and that of the sequential condition, supporting the existence of the format-dependent process for the numerosity representation. Taken together, our findingssuggest that the numerical representation may involve a complex set of multiple stages.
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