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. 2009 May 15;4(5):e5581. doi: 10.1371/journal.pone.0005581

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Top panel: Left to right: increasing strength of social cues leading to the response: ‘Cartoons Closer’. Bottom panel: Example of a single trial.