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. 2013 Feb 13;371(1984):20110534. doi: 10.1098/rsta.2011.0534

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© 2012 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 3. — (a,b) An illustration of two signals whose activity levels are correlated, which leads to a correlation of their squares and . However, the signals are uncorrelated in the conventional sense.

Inline graphic — (a,b) An illustration of two signals whose activity levels are correlated, which leads to a correlation of their squares and . However, the signals are uncorrelated in the conventional sense.