Selective overweighting of larger magnitudes during noisy numerical comparison
Selective overweighting of larger magnitudes during noisy numerical comparison
复制标题
在嘈杂的数值比较期间选择性地过度加权更大幅度
DOI:
10.1038/s41562-017-0145
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发表时间:
2017
影响因子:
29.9
通讯作者:
Summerfield
中科院分区:
文献类型:
--
作者:
Spitzer;Waschke;Summerfield
Humans are often required to compare average magnitudes in numerical data; for example, when comparing product prices on two rival consumer websites. However, the neural and computational mechanisms by which numbers are weighted, integrated and compared during categorical decisions are largely unknown,,,,. Here, we show a systematic deviation from ‘optimality’ in both visual and auditory tasks requiring averaging of symbolic numbers. Participants comparing numbers drawn from two categories selectively overweighted larger numbers when making a decision, and larger numbers evoked disproportionately stronger decision-related neural signals over the parietal cortex. A representational similarity analysis showed that neural (dis)similarity in patterns of electroencephalogram activity reflected numerical distance, but that encoding of number in neural data was systematically distorted in a way predicted by the behavioural weighting profiles, with greater neural distance between adjacent larger numbers. Finally, using a simple computational model, we show that although it is suboptimal for a lossless observer, this selective overweighting policy paradoxically maximizes expected accuracy by making decisions more robust to noise arising during approximate numerical integration. In other words, although selective overweighting discards decision information, it can be beneficial for limited-capacity agents engaging in rapid numerical averaging.
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影响因子:
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作者:
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DOI:
--
发表时间:
2012
期刊:
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通讯作者:
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