Laminar differences in gamma and alpha coherence in the ventral stream
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Desimone-2011-June-Laminar differences in gamma.pdf
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Author(s)
Buffalo, Elizabeth A.
Fries, Pascal
Landman, Rogier
Buschman, Tim
Desimone, Robert
Date Issued
June 2011
Journal
Proceedings of the National Academy of Sciences
Publisher
Proceedings of the National Academy of Sciences (PNAS)
Citation
Buffalo, E. A. et al. “Laminar Differences in Gamma and Alpha Coherence in the Ventral Stream.” Proceedings of the National Academy of Sciences 108.27 (2011): 11262-11267. Web. 8 Feb. 2012.
Version
Final published version
Abstract
Attention to a stimulus enhances both neuronal responses and gamma frequency synchrony in visual area V4, both of which should increase the impact of attended information on downstream neurons. To determine whether gamma synchrony is common throughout the ventral stream, we recorded from neurons in the superficial and deep layers of V1, V2, and V4 in two rhesus monkeys. We found an unexpected striking difference in gamma synchrony in the superficial vs. deep layers. In all three areas, spike-field coherence in the gamma (40–60 Hz) frequency range was largely confined to the superficial layers, whereas the deep layers showed maximal coherence at low frequencies (6–16 Hz), which included the alpha range. In the superficial layers of V2 and V4, gamma synchrony was enhanced by attention, whereas in the deep layers, alpha synchrony was reduced by attention. Unlike these major differences in synchrony, attentional effects on firing rates and noise correlation did not differ substantially between the superficial and deep layers. The results suggest that synchrony plays very different roles in feedback and feedforward projections.
MIT Department
McGovern Institute for Brain Research at MIT
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1073/pnas.1011284108
