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#v4

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Fabrizio Musacchio

In their study, Morales-Gregorio et al. show that in shift dynamically under top-down influence from . They identify two distinct population activity states – eyes open vs. closed – with notably stronger V4→V1 signaling in the foveal region during eyes-open periods. A cool example of how cognitive context reshapes visual cortical dynamics.

🌍 cell.com/cell-reports/fulltext

#CompNeuro#Neuroscience#VisualCortex
Kriszta Satori

V Telex.hu:
'Acc to #Hungary ’s PM there was agreement among the #V4 countries that #Russia 's aggression was a gross violation of international law and that #Ukraine should be helped. 

#Orbán it is in Hungary's interest, and it is the country's most important national security concern, not to share a border with Russia, because we have bad memories of that.'

telex.hu/english/2024/02/27/hu

Telex · Hungary's most important national security concern is not to share a border with Russia – Orbán at V4 summitBy Fehér János
European News 🇪🇺

Visegrad leaders meeting would not bring results, says Czech PM

A prime ministerial meeting of the Visegrad Group, consisting of Czechia, Slovakia, Poland and Hungary, has not yet been convened as it would not produce any results, Czech Prime Minister Petr Fiala said.

euractiv.com/section/politics/

EURACTIV · Visegrad leaders meeting would not bring results, says Czech PMBy Aneta Zachová
#News#EuropeanNews#Europe
Fabrizio Musacchio

New by @AitorMoraGre on in changing with top-down signals from targeting the foveal region

🌎 biorxiv.org/content/10.1101/20
thread: twitter.com/AitorMoraGre/statu (including a cool animation 💫)

bioRxivNeural manifolds in V1 change with top-down signals from V4 targeting the foveal regionHigh-dimensional brain activity is often organised into lower-dimensional neural manifolds. However, the neural manifolds of the visual cortex remain understudied. Here, we study large-scale multielectrode electrophysiological recordings of macaque ( Macaca mulatta ) areas V1, V4 and DP with a high spatio-temporal resolution. We find, for the first time, that the population activity of V1 contains two separate neural manifolds, which correlate strongly with eye closure (eyes open/closed) and have distinct dimensionalities. Moreover, we find strong top-down signals from V4 to V1, particularly to the foveal region of V1, which are significantly stronger during the eyes-open periods, a previously unknown effect. Finally, in silico simulations of a balanced spiking neuron network qualitatively reproduce the experimental findings. Taken together, our analyses and simulations suggest that top-down signals modulate the population activity of V1, causing two distinct neural manifolds. We postulate that the top-down modulation during the eyes-open periods prepares V1 for fast and efficient visual responses, resulting in a type of visual stand-by mode. ### Competing Interest Statement The authors have declared no competing interest.
#computationalneuroscience#compneuro
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