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. 2012 Jul 23;7(7):e40663. doi: 10.1371/journal.pone.0040663

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Lerner et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The first and third neighborhoods are shown (The second and fourth neighborhoods had similar connections, with no further connections between the four neighborhoods). Specific words are attached to the concept numbers for easier conceptualization. Connections between concepts are indicated by the lines connecting the circles, with basic-strength relations drawn in black and strong relations drawn in red. The connections form two basic neighborhoods, animals and liquid foods, with some connections crossing between neighborhoods. Word pairs like Bull-Cow or Bouillon-Soup are examples of the first-type pairs. Milk-Cow and Chicken-Soup are examples of the second-type pairs (see text for details).