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. 2013 Winter;12(4):618–627. doi: 10.1187/cbe.13-08-0154

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© 2013 M. K. Smith et al.CBE—Life Sciences Education © 2013 The American Society for Cell Biology. This article is distributed by The American Society for Cell Biology under license from the author(s). It is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0).

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Figure 3. — An excerpt of the COPUS coding form. Observers place a single checkmark in the box if a behavior occurs during a 2-min segment. Multiple codes can be marked in the same 2-min block.