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• W2462022209 endingPage "1888" @default.
• W2462022209 startingPage "1859" @default.
• W2462022209 abstract "The free-energy principle is a candidate unified theory for learning and memory in the brain that predicts that neurons, synapses, and neuromodulators work in a manner that minimizes free energy. However, electrophysiological data elucidating the neural and synaptic bases for this theory are lacking. Here, we propose a novel theory bridging the information-theoretical principle with the biological phenomenon of spike-timing dependent plasticity (STDP) regulated by neuromodulators, which we term mSTDP. We propose that by integrating an mSTDP equation, we can obtain a form of Friston's free energy (an information-theoretical function). Then we analytically and numerically show that dopamine (DA) and noradrenaline (NA) influence the accuracy of a principal component analysis (PCA) performed using the mSTDP algorithm. From the perspective of free-energy minimization, these neuromodulatory changes alter the relative weighting or precision of accuracy and prior terms, which induces a switch from pattern completion to separation. These results are consistent with electrophysiological findings and validate the free-energy principle and mSTDP. Moreover, our scheme can potentially be applied in computational psychiatry to build models of the faulty neural networks that underlie the positive symptoms of schizophrenia, which involve abnormal DA levels, as well as models of the NA contribution to memory triage and posttraumatic stress disorder." @default.
• W2462022209 created "2016-07-22" @default.
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• W2462022209 creator A5036511331 @default.
• W2462022209 creator A5066085950 @default.
• W2462022209 date "2016-09-01" @default.
• W2462022209 modified "2023-09-30" @default.
• W2462022209 title "Linking Neuromodulated Spike-Timing Dependent Plasticity with the Free-Energy Principle" @default.
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• W2462022209 doi "https://doi.org/10.1162/neco_a_00862" @default.
• W2462022209 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27391680" @default.
• W2462022209 hasPublicationYear "2016" @default.
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