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. 2016 Dec 28;27(1):254–264. doi: 10.1093/cercor/bhw395

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© The Author 2016. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 6. — Surface plots showing empirical (a) and model (b) SNRs as a function of frequency (left abscissa) and contrast (right abscissa). The condition was the A5 + B7 mask condition from the space experiment, in which the 7 Hz mask component had a fixed contrast of 32%, and the 5 Hz target component contrast increased along the right abscissa. The blue-highlighed functions indicate the target frequency (5 Hz) and its harmonics. The red-highlighted functions indicate the mask frequency (7 Hz) and its harmonics. Green-highlighted functions indicate the intermodulation frequencies (7−5 = 2 Hz and 7 + 5 = 12 Hz). In the human data, the higher harmonics produce relatively larger amplitudes than in the model. Model parameters are given in the caption to Figure 3.