Chronic stress disrupts neural coherence between cortico-limbic structures

Chronic stress impairs cognitive function, namely on tasks that rely on the integrity of cortico-limbic networks. To unravel the functional impact of progressive stress in cortico-limbic networks we measured neural activity and spectral coherences between the ventral hippocampus (vHIP) and the medial prefrontal cortex (mPFC) in rats subjected to short term stress (STS) and chronic unpredictable stress (CUS). CUS exposure consistently disrupted the spectral coherence between both areas for a wide range of frequencies, whereas STS exposure failed to trigger such effect. The chronic stress-induced coherence decrease correlated inversely with the vHIP power spectrum, but not with the mPFC power spectrum, which supports the view that hippocampal dysfunction is the primary event after stress exposure. Importantly, we additionally show that the variations in vHIP-to-mPFC coherence and power spectrum in the vHIP correlated with stress-induced behavioral deficits in a spatial reference memory task. Altogether, these findings result in an innovative readout to measure, and follow, the functional events that underlie the stress-induced reference memory impairments.

PACOTE ANTI-CORRUPÇÃO DE DILMA?

Olhemos para uma folha de São Paulo no meio do trânsito caótico e dos milhares de arranha-céus, enquanto passam centenas de buzinantes motoqueiros suicidas a uma velocidade estonteante… Depois de milhões de pessoas se terem manifestado no Brasil por causa de megas-processos de corrupção que têm sido descobertos, entre os quais o Petrolão, no qual as investigações apontam que a propina (suborno) foi o triplo do caso Mensalão, eis que a Presidenta Dilma avança para um pacote anti-corrupção. A operação Lava Jato já fala em milhares de milhões de reais. Mas, importante, é que apenas uma medida tem efeitos de aplicação imediata! São 7 as medidas. § Let us look for a Folha de Sao Paulo in the middle of chaotic traffic and thousands of skyscrapers, as they pass hundreds of suicide motorcycle at breakneck speed ... After millions of people have expressed in Brazil because of corruption mega-processes that have been discovered, including the Petrolão in which investigations indicate that the bribe (bribery) was triple the Mensalão case, behold, the President Dilma advances to an anti-corruption package. Operation Lava Jet is already talking about billions of reais. But, importantly, it is that only a measure takes effect immediately applicable! There are 7 steps.