In the current work, we investigated whether capuchin monkeys preferred densely distributed resources to sparsely distributed resources in a 2-choice discrimination task with edible rewards. Capuchin monkeys were biased to select a denser food set over the same number of food items in a sparsely arranged set. Furthermore, increased density of the larger food set facilitated discrimination performance in quantity comparisons with a true difference in set size. These results align with previous studies demonstrating a preference for densely distributed food sets in infants and callitrichid primates, as well as previous evidence of a density bias among several rhesus macaques and capuchin monkeys in a computerized relative quantity discrimination task. Thus, the density bias appears to emerge across multiple domains and presentation formats for some primate species. The role of density in perceived numerosity by capuchin monkeys and other species as it pertains to the foraging domain is discussed. (PsycINFO Database Record (c) 2020 APA, all rights reserved).

中文翻译：

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密度偏差：卷尾猴（Sapajus apella）在食物选择任务中喜欢排列密集的物品。

在当前的工作中，我们调查了卷尾猴是否在具有可食奖励的二选歧视任务中偏爱密集分布的资源而不是稀疏分布的资源。卷尾猴倾向于在稀疏排列的食物中选择相同数量的食物来选择较密集的食物。此外，较大食品组合的密度增加，在数量比较中具有真正的组合尺寸差异，有助于判别性能。这些结果与先前的研究相吻合，先前的研究表明偏爱婴儿和Callitrichid灵长类动物的食物分布较稠密，以及先前在计算机化的相对数量歧视任务中某些恒河猴和卷尾猴之间的密度偏差的证据。从而，某些灵长类物种的密度偏倚似乎跨多个领域和表现形式出现。讨论了卷尾猴和其他物种在觅食领域中密度在感知的数量上的作用。（PsycINFO数据库记录（c）2020 APA，保留所有权利）。