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02.03.2017, 09:55 - nieeshoes - Rank 6 - 1073 Posts
the strands and watched how long the spiders searched for their stolen meals. Losing a greater volume of food inspired more strumming of the web and searching about. But losing four items instead of just one or two increased the search time even more,
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, Rodríguez and his colleagues reported in 2015 in Animal Cognition. It’s not just volume of food in a hoard,
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, they argue. Numerosity has its own effects.
At a glance
Nonhuman animals don’t have human language for counting, so researchers studying behavior talk about an “approximate number system” that allows for good-enough estimates of quantities with no real counting. One of the features of this still mysterious system is its declining accuracy in comparing bigger numbers that are very close together,
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, the trend that made Sedona the collie’s struggles as noteworthy as her successes.
As the ratios of the two quantities Sedona had to compare drew closer to 1,
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, she was more prone to make mistakes. Her scores worsened as she moved from 0.11 (comparing 1 to 9),
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, 0.2 (1 to 5) and so on. She never conquered the fiendish 8 versus 9. That same trend,
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, described by what’s called Weber’s law, shows up in humans’ nonverbal approximate number system as well as in those of other animals.

Reckoning with Weber’s law,
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?


Quick,
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, which of the two circles in each pair has more dots in it? Weber’s law predicts that the answer comes easier when object numbers

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