Surface color and predictability determine contextual modulation of V1 firing and gamma oscillations

• DOI: 10.7554/elife.42101
• Publication Date: 2019-02-04T13:10:32Z
• Authors: Alina Peter; Cem Uran; Johanna Klon-Lipok; Rasmus Roese; Sylvia van Stijn; William Barnes; Jarrod R Dowdall; Wolf Singer; Pascal Fries; Martin Vinck
• Keywords: Predictability; Stimulus (psychology); Stimulus onset asynchrony; Surround suppression; Magnetoencephalography

The integration of direct bottom-up inputs with contextual information is a core feature neocortical circuits. In area V1, neurons may reduce their firing rates when receptive field input can be predicted by spatial context. Gamma-synchronized (30–80 Hz) provide complementary signal to rates, reflecting stronger synchronization between neuronal populations receiving mutually predictable inputs. We show that large uniform surfaces, which have high predictability, strongly suppressed yet induced prominent gamma in macaque particularly they were colored. Yet, chromatic mismatches center and surround, breaking reduced while increasing rates. Differences responses different colors, including strong gamma-responses red, arose from stimulus adaptation full-screen background, suggesting differences M- L-cone signaling pathways. Thus, synchrony signaled whether RF context, increased stimuli unpredicted