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17 results on '"Roese, Rasmus"'

10. Gamma-cycle duration predicts instantaneous amplitude, spike rate and synchrony in macaque V1

Author

Spyropoulos, Georgios, Dowdall, Jarrod Robert, Schölvinck, Marieke Louise, Bosman, Conrado Arturo, Lima, Bruss, Peter, Alina, Onorato, Irene, Klon-Lipok, Johanna, Roese, Rasmus, Neuenschwander, Sergio, Singer, Wolf, Vinck, Martin, and Fries, Pascal

Subjects
Quantitative Biology::Neurons and Cognition
Abstract

SUMMARY Communication among visual cortical areas depends on gamma oscillations. Respective gamma cycles vary substantially in amplitude and duration, yet it is unclear how those fundamental parameters relate to each other and to spiking activity. We recorded local-field-potentials (LFPs) and spiking activity from awake macaque area V1 and detected amplitude, duration and spiking activity per gamma cycle. Longer durations predicted larger amplitudes and stronger spike synchrony, yet lower spike rates. These findings suggest that spontaneous gamma-variability reflects inhibitory mechanisms that reduce spike rates, increase synchronization, and prolong the cycle duration. The classical LFP power-spectrum, estimated on longer time scales, was most strongly predicted from how often certain gamma-cycle durations occurred, rather than by their associated instantaneous amplitudes.

Published
2019
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13. Spontaneous variability in gamma dynamics described by a linear harmonic oscillator driven by noise

Author

Spyropoulos, Georgios, primary, Dowdall, Jarrod Robert, additional, Schölvinck, Marieke Louise, additional, Bosman, Conrado Arturo, additional, Lima, Bruss, additional, Peter, Alina, additional, Onorato, Irene, additional, Klon-Lipok, Johanna, additional, Roese, Rasmus, additional, Neuenschwander, Sergio, additional, Singer, Wolf, additional, Vinck, Martin, additional, and Fries, Pascal, additional

Published
2019
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15. Surface color and predictability determine contextual modulation of V1 firing and gamma oscillations

Author

Colgin, Laura, Peter, Alina, Uran, Cem, Klon-Lipok, Johanna, Roese, Rasmus, Stijn, Sylvia van, Barnes, William, Dowdall, Jarrod Robert, Singer, Wolf, Fries, Pascal, Vinck, Martin, Colgin, Laura, Peter, Alina, Uran, Cem, Klon-Lipok, Johanna, Roese, Rasmus, Stijn, Sylvia van, Barnes, William, Dowdall, Jarrod Robert, Singer, Wolf, Fries, Pascal, and Vinck, Martin

Abstract

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

Published
2019

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