SEMCIÊNCIA

Fiz um update no artigo, mas precisa revisar e atualizar a bibliografia: Dreams, endocannabinoids and itinerant dynamics in neural networks: re elaborating Crick-Mitchison unlearning hypothesis Osame Kinouchi ,  Renato Rodrigues Kinouchi (Submitted on 30 Aug 2002 ( v1 ), last revised 12 Jul 2010 (this version, v3)) In this work we reevaluate and elaborate Crick-Mitchison's proposal that REM-sleep corresponds to a self-organized process for unlearning attractors in neural networks. This reformulation is made at the face of recent findings concerning the intense activation of the amygdalar complex during REM-sleep, the role of endocannabinoids in synaptic weakening and neural network models with itinerant associative dynamics. We distinguish between a neurological REM-sleep function and a related evolutionary/behavioral dreaming function. At the neurological level, we propose that REM-sleep regulates excessive plasticity and weakens over stable brain activation patterns, specially in...

Ainda do physics Arxiv Blog : Quantum consciousness, a phrase that sends most eggheads running for the hills, is currently on a roll. A coupla months back, Efstratios “Moussaka” Manousakis of Florida State University in Tallahassee published a paper suggesting that a certain kinda optical illusion could be explained in quantum terms. The optical illusion in question is the double image flip like the one above which switches from one scene to another in the viewer’s mind. Neuroscientists have always wondered why ya can’t see both images at the same time. The new thinkin is that the image exists in a kinda quantum superposition of both states. When this state collapses, it gives the observer the sense that he or she is lookin at one scene or the other (but not both). That sounds interesting but the impressive thing about Moussaka’s work is that it succesfully predicts the rate at which this flipping occurs in humans. Now quantum physicist Henry “Goose” Stapp from the Lawerence Berke...

Ler e mandar para Juliana Dias. Verificar as referências, especialmente a do New Journal of Physics. Ver também: Neuroscience: States of mind : Nature 425, 912-913 doi : 10.1038/425912a Learning in cognitive systems with autonomous dynamics Authors: Claudius Gros , Gregor Kaczor (Submitted on 8 Apr 2008) Neural networks with transient state dynamics Claudius Gros 2007 New J. Phys. 9 109 doi: 10.1088/1367-2630/9/4/109 PDF (670 KB) HTML References Claudius Gros 1 Institute of Theoretical Physics, J.W. Goethe University Frankfurt, 60438 Frankfurt, Germany 1 http://itp.uni-frankfurt.de/Ëœgros Abstract. We investigate dynamical systems characterized by a time series of distinct semi-stable activity patterns, as they are observed in cortical neural activity patterns. We propose and discuss a general mechanism allowing for an adiabatic continuation between attractor networks and a specific adjoined transient-state network, which is strictly dissipative. Dynamical systems with trans...