Journal
NEURON
Volume 85, Issue 2, Pages 390-401Publisher
CELL PRESS
DOI: 10.1016/j.neuron.2014.12.018
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Funding
- Human Frontier Science Program Organization Grant [RGP0070/2003]
- Volkswagen Foundation [I/79876]
- European Science Foundation European Young Investigator Award Program
- European Union [HEALTH-F2-2008-200728]
- LOEWE program (Neuronale Koordination Forschungsschwerpunkt Frankfurt)
- Smart Mix Programme of the Netherlands Ministry of Economic Affairs
- Netherlands Ministry of Education, Culture and Science (BrainGain)
- Netherlands Organization for Scientific Research [452-03-344]
- National Science Foundation [2009090358]
- U.S. Department of State
- LabEx CORTEX [ANR-11-LABX-0042]
- [ANR-11-BSV4-501]
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Visual cortical areas subserve cognitive functions by interacting in both feedforward and feedback directions. While feedforward influences convey sensory signals, feedback influences modulate feedforward signaling according to the current behavioral context. We investigated whether these interareal influences are subserved differentially by rhythmic synchronization. We correlated frequency-specific directed influences among 28 pairs of visual areas with anatomical metrics of the feedforward or feedback character of the respective interareal projections. This revealed that in the primate visual system, feedforward influences are carried by theta-band (similar to 4 Hz) and gamma-band (similar to 60-80 Hz) synchronization, and feedback influences by beta-band (similar to 14-18 Hz) synchronization. The functional directed influences constrain a functional hierarchy similar to the anatomical hierarchy, but exhibiting task-dependent dynamic changes in particular with regard to the hierarchical positions of frontal areas. Our results demonstrate that feedforward and feedback signaling use distinct frequency channels, suggesting that they subserve differential communication requirements.
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