article_snippet.sent: But how our tell how far away it is had remained a mystery. '
article_snippet.sent: As the source moved further away, therefore, the neurons fired less and less.
article_snippet.sent: But it is necessary and beneficial in order to recognise distance.'
highlights_snippet.sent: University of Connecticut study reveals how we can measure distances .
  
highlights_snippet.sent: But when it is distant, our neurons fire less, and we know it is further away .