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Predrag Cvitanović

@chaosbook.bsky.social

Theoretical physicist. Publications and online courses on field theory, group theory, chaos, turbulence - http://ChaosBook.org/~predrag. Please list your good online talks on https://researchseminars.org, blueprint them here. Don't give bad talks, period.

150 Posts705 Follower1776 Folgt
Trends in Cognitive Sciences@cp-trendscognsci.bsky.social · 5d ago

Online Now: Neural reactivation supports memory formation when events end

Neural reactivation supports memory formation when events end

Memory routinely transforms continuous experience into discrete episodes that support flexible retrieval. We propose that these structured representations are established via rapid neural reactivation occurring at the completion of an event. A growing body of evidence across tasks and recording modalities shows that event termination elicits rapid reinstatement of recently encoded neural representations. We review findings revealing that end-of-event reactivation is a robust and functionally meaningful phenomenon, describing when it occurs, how it is measured, and which neural signatures characterize it. We propose that neural reactivation at event offsets offers an efficient neural mechanism for stabilizing newly formed traces against interference, binding relational features into a coherent event index, integrating episodes into pre-existing schemas, and preserving temporal continuity across events.

dlvr.it

Scott Horton@robertscotthorton.bsky.social · 6d ago

9 countries now possess nuclear weapons. Arms control agreements have collapsed. Geopolitical competition is intensifying rivalries between nuclear-armed powers. The potential for the automation of nuclear launch decisions themselves in an age of artificial intelligence looms over the conversation.

Putting Armageddon on Autopilot: How Artificial Intelligence Could Make Nuclear Threats More Effective

Nine countries now possess nuclear weapons. Arms control agreements painstakingly built over decades have collapsed. Geopolitical competition is

warontherocks.com

Signal@signal.org · 6d ago

Introducing Automatic Key Verification! Complementing the existing safety number system, automatic key verification provides an additional, streamlined way to confirm the privacy of your chats. signal.org/blog/automat... TY @cloudflare.social and @trailofbits.bsky.social our independent auditors 💙🙏

Introducing Automatic Key Verification

Signal now offers a feature called “automatic key verification” which complements the existing safety number system. Signal is always end-to-end encrypted, and automatic key verification provides an a...

signal.org

Nora Harhen@noraharhen.bsky.social · 6d ago

How do we make good decisions with little experience? Adults can rely on memories of past choices. In our new study in @pnas.org we show kids & teens do something similar–but what they remember turns out to be quite different! www.pnas.org/doi/10.1073/...

Developmental changes in memory structure and precision alter the use of retrieved episodes during decisions for reward | PNAS

Most widely studied option evaluation strategies rely on knowledge accumulated across repeated experiences. But how should options be evaluated in ...

pnas.org

Joshua Weitz@joshuasweitz.bsky.social · last wk.

What new evidence is this based on? Which experts were consulted? If the data is compelling - why resort to an exec order? The White House & HHS continue to let misinformation and ideology drive vaccine policies and action taking - putting families & children at risk. 🎁 wapo.st/45REqVL

Trump administration order would upend nation’s childhood vaccine schedule

The president has pushed to narrow which vaccines are administered to children and split shots up into multiple appointments.

wapo.st

Matt Pearce@mattdpearce.com · 6d ago

I got curious and checked “Last of the Mohicans,” and while it’s true that the prose is starchy, this opening paragraph is a banger and you should not deny yourself the pleasure of the effort.

T was a feature peculiar to the colonial wars of North America, that the toils and dangers of the wilderness were to be encountered, before the adverse hosts could meet. A wide, and, apparently, an impervious boundary of forests, severed the possessions of the hostile provinces of France and England. The hardy colonist, and the trained European who fought at his side, frequently expended months in struggling against the rapids of the streams, or in effecting the rugged passes of the mountains, in quest of an opportunity to exhibit their courage in a more martial conflict. But, emulating the patience and self-denial of the practised native warriors, they learned to overcome every difficulty; and it would seem, that in time, there was no recess of the woods so dark, nor any secret place so lovely, that it might claim exemption from the inroads of those who had pledged their blood to satiate their vengeance, or to uphold the cold and selfish policy of the distant monarchs of Europe.
Joshua Weitz@joshuasweitz.bsky.social · 7d ago

Critical for NIH & CDC Directors to answer questions and follow-ups from press on the record. What is the evidence basis for the decision? Are MMR vaccines safe and effective? What is the expected reduction in vax rates? What will their agencies do to comply? www.whitehouse.gov/presidential...

Delivering Gold Standard Childhood Vaccine Recommendations for Americans

By the authority vested in me as President by the Constitution and the laws of the United States of America, it is hereby ordered: Section 1. Every child deserves a safe and nurturing home where they ...

whitehouse.gov

Physics World@physicsworld.bsky.social · 6d ago

Heat flows from hot objects to cold objects – a natural consequence of the second law of thermodynamics. But a quantum mechanism called indefinite causal order can reverse this flow of heat without breaking any thermodynamics laws. 🧪⚛️💡 physicsworld.com/a/quantum-pr...

Quantum principle allows heat to flow from cold to hot – Physics World

Heat flows from hot objects to cold objects – or does it? Although unidirectional heat flow is a natural consequence of the second law of thermodynamics,

physicsworld.com