Stable individual differences in number discrimination in infancy.

Stable individual differences in number discrimination in infancy.
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DOI:
10.1111/j.1467-7687.2009.00948.x
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发表时间:
2010-11
影响因子:
3.7
通讯作者:
Brannon EM
Brannon EM
中科院分区:
心理学1区
文献类型:
--
作者:
Libertus ME;Brannon EM

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先前的研究表明,作为一个群体,6个月大的婴儿在数值差异至少为1:2的情况下能够成功地区分数字变化,但在比例为2:3的情况下就会失败(例如,8与16,而不是8与12)。然而,目前还没有研究考察婴儿在数字辨别方面的个体差异。使用一种新的数字变化检测范式,我们提供了更直接的证据,证明婴儿的数字感知是比例依赖的,即使在可区分的比例范围内,因此符合韦伯定律。此外,我们发现婴儿在6个月时的数字辨别能力可靠地预测了他们在9个月时的数字辨别能力,而不是视觉短期记忆。因此,数值辨别敏锐度的个体差异可能在出生后的一年内保持稳定,并为未来的纵向研究探索婴儿数值辨别与以后发展的数学成就之间的关系提供了重要的途径。
Previous studies have shown that as a group 6-month-old infants successfully discriminate numerical changes when the values differ by at least a 1:2 ratio but fail at a 2:3 ratio (e.g., 8 vs. 16 but not 8 vs. 12). However, no studies have yet examined individual differences in number discrimination in infancy. Using a novel numerical change detection paradigm, we present more direct evidence that infants' numerical perception is ratio-dependent even within the range of discriminable ratios and thus adheres to Weber's Law. Furthermore, we show that infants' numerical discrimination at six months reliably predicts their numerical discrimination abilities but not visual short-term memory at nine months. Thus, individual differences in numerical discrimination acuity may be stable within the first year of life and provide important avenues for future longitudinal research exploring the relationship between infant numerical discrimination and later developing math achievement.
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