Discrete and analogue quantity processing in the parietal lobe: A functional MRI study

被引:185
作者
Castelli, F
Glaser, DE
Butterworth, B
机构
[1] CALTECH, Div Humanities & Social Sci, Pasadena, CA 91125 USA
[2] UCL, Inst Cognit Neurosci, London WC1N 3AR, England
关键词
discrete stimuli; magnitude processing; nonsymbolic numerical processing; numerosity; analogue stimuli;
D O I
10.1073/pnas.0600444103
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The human intraparietal sulcus (IPS) is implicated in processing symbolic number information and possibly in nonsymbolic number information. Specific IPS activity for discrete quantities (numerosities) as compared with continuous, analogue quantity has not been demonstrated. Here we use a stimulus-driven paradigm to distinguish automatic estimation of "how many things" from "how much" and "how long." The discrete analogue response task (DART) uses the perception of hues which can change either abruptly (discrete, numerous stimuli) or smoothly (analogue, non-numerous stimuli) in space or in time. Subjects decide whether they saw more green or more blue. A conjunction analysis of spatial and temporal conditions revealed that bilateral IPS was significantly more active during the processing of discrete stimuli than during analogue stimuli, as was a parietal-occipital transition zone. We suggest that processing numerosity is a distinct process from processing analogue quantity, whether extended in space or time, and that an intraparietal network connects objects' segmentation to the estimation of their numerosity.
引用
收藏
页码:4693 / 4698
页数:6
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