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. 2008 Jul 23;28(30):7679–7686. doi: 10.1523/JNEUROSCI.5640-07.2008

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Copyright © 2008 Society for Neuroscience 0270-6474/08/287679-08$15.00/0

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Figure 10. — Comparison of attentional modulation in two layers. a, Differences in attentional modulation between the two layers V1 and V4. The gamma modulation in the upper layer is up to 50% stronger than in the lower layer. The rate modulation in V4 is up to 28% stronger than in V1. In general, modulations in V4 are stronger than modulations in V1. b, Different g_AMPA/g_NMDA ratio in the two layers. The g_AMPA/g_NMDA ratio in layer V1 is 0.0 and in layer V4 is 0.15. Layer V4 clearly synchronizes in the gamma-frequency band, whereas V1 does not.