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. 2013 Nov;20(11):607–610. doi: 10.1101/lm.032490.113

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© 2013 Knutson et al.; Published by Cold Spring Harbor Laboratory Press

This article is distributed exclusively by Cold Spring Harbor Laboratory Press for the first 12 months after the full-issue publication date (see http://learnmem.cshlp.org/site/misc/terms.xhtml). After 12 months, it is available under a Creative Commons License (Attribution-NonCommercial 3.0 Unported), as described at http://creativecommons.org/licenses/by-nc/3.0/.

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Figure 1. — Sample displays. The task was to identify the unique object (asterisk). (Top row) Representative displays from difficulty levels 1 and 4. (Bottom row) Representative displays from difficulty levels 5 and 8. At all difficulty levels, every appendage appeared on more than one object, and the unique object could not be identified by the presence of a single feature. Instead, the conjunction of multiple appendages defined the unique object.