PNAS2014-05-05 7:22 PM

猴子所做的符号加法为正态变量编码提供证据 Symbol addition by monkeys provides evidence for normalized quantity coding

研究意义 
符号识字的猴子可以受训进行合并,加法和双乘数字运算。这种运算行为转换到新的符号集合而非单纯记忆每对符号。他们的加法运算行为表明了量级的隐含相对程度。 
Significance 
Symbol-literate monkeys can be trained to combine, or add, pairs of large numbers. They transfer to a novel symbol set, ruling out memorization of each symbol pair. Their addition behavior indicates an underlying relative scaling of magnitude. 
论文摘要 
韦伯定律可以通过刺激幅度所得的感官反应的压缩比例或通过响应变化比例而解释。这两种机制可以通过询问如何进行变量相加或相减来得到区分。我们训练恒河猴将26个不同符号与0-25滴奖励联想在一起,然后测试它们如何进行合并或加法运算,这象征性地代表了奖励幅度。我们发现,他们可以合并象征性表示的量级,且能将这种能力转换成新的符号集,这表明它们是在执行计算而非记忆每个合并值。他们对符号的合并不是表示线性或压缩的比例,而是表示一个动态变化的相对比例。 
Abstract 
Weber's law can be explained either by a compressive scaling of sensory response with stimulus magnitude or by a proportional scaling of response variability. These two mechanisms can be distinguished by asking how quantities are added or subtracted. We trained Rhesus monkeys to associate 26 distinct symbols with 0–25 drops of reward, and then tested how they combine, or add, symbolically represented reward magnitude. We found that they could combine symbolically represented magnitudes, and they transferred this ability to a novel symbol set, indicating that they were performing a calculation, not just memorizing the value of each combination. The way they combined pairs of symbols indicated neither a linear nor a compressed scale, but rather a dynamically shifting, relative scaling. 

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