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   From: here@is.invalid   
      
   Why the Human Brain Perceives Small Numbers Better   
      
   The discovery that the brain has different systems for representing   
   small and large numbers provokes new questions about memory, attention   
   and mathematics.   
      
   More than 150 years ago, the economist and philosopher William Stanley   
   Jevons discovered something curious about the number 4. While musing   
   about how the mind conceives of numbers, he tossed a handful of black   
   beans into a cardboard box. Then, after a fleeting glance, he guessed   
   how many there were, before counting them to record the true value.   
   After more than 1,000 trials, he saw a clear pattern. When there were   
   four or fewer beans in the box, he always guessed the right number.   
   But for five beans or more, his quick estimations were often   
   incorrect.   
      
   Jevons' description of his self-experiment, published in Nature in   
   1871, set the "foundation of how we think about numbers," said Steven   
   Piantadosi, a professor of psychology and neuroscience at the   
   University of California, Berkeley. It sparked a long-lasting and   
   ongoing debate about why there seems to be a limit on the number of   
   items we can accurately judge to be present in a set.   
      
   Now, a new study in Nature Human Behaviour has edged closer to an   
   answer by taking an unprecedented look at how human brain cells fire   
   when presented with certain quantities. Its findings suggest that the   
   brain uses a combination of two mechanisms to judge how many objects   
   it sees. One estimates quantities. The second sharpens the accuracy of   
   those estimates -- but only for small numbers.   
      
   https://www.quantamagazine.org/why-the-human-brain-perceives-sma   
   l-numbers-better-20231109/   
      
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