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[[Vol. 1]Atomic nano-switches emulate human memory_ WPI-MANA.pdf](https://mdr.nims.go.jp/filesets/96821d07-145f-42f7-b68b-96c124075a8f/download)

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International Center for Materials Nanoarchitectonics (WPI-MANA)

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[[Research Highlights Vol.1] Atomic Nano-Switches Emulate Human Memory](https://mdr.nims.go.jp/datasets/4c7ced5e-6c94-4b15-b422-0045f0e32fac)

## Fulltext

2022/04/04 10:31 Atomic nano-switches emulate human memory| MANAhttps://www.nims.go.jp/mana/research/highlights/vol1.html 1/2Previous  Index  NextResearch Highlights[Vol. 1]Atomic nano-switches emulate human memory14 Sep, 2011MANA scientists discover that inorganic synapses mimic the human brain.Figure : Tailor-made dielectric nanosheet via controlled nanoscale doping. (a)Structural change induced by Nb doping. (b) AFM image of titanium-niobatenanosheet.In a breakthrough, researchers at the International Center for Materials Nanoarchitectonics(MANA) demonstrate for the first time the key features in the neuroscience and psychology ofmemory by a AgS2 synapse.Artificial neural networks have attracted attention as a means to a better understanding ofbiological neural networks, as well as aiding developments in artificial intelligence. The complexand interconnected nature of thought processes make neural behavior difficult to reproduce inartificial structures without software programming. Now Takeo Ohno and researchers at theInternational Center for Materials Nanoarchitectonics (MANA), Tsukuba, Japan, and the Universityof California have mimicked synaptic activity with the electroionic behavior of a nanoscaleAgS2 electrode.The researchers observed a temporary higher-conductance state in the AgS2 system following anincident electric pulse. Repetition of the input pulse over 2 s intervals led to permanently higherconductance. These two responses mimic the short-term plasticity and long-term potentiality inbiological synapses.In the most widely accepted ‘multistore’ model of memory in human psychology, new informationis stored briefly as a sensory memory. Rehearsal converts short-term memory to long-term. Whendemonstrating memorization of the numerals ‘1’ and ‘2’ in a 7 × 7 inorganic synapse array, thebehaviour of the artificial synapse indicated ‘multistore’ memory rather than a conventional switch.https://www.nims.go.jp/mana/research/highlights/index.htmlhttps://www.nims.go.jp/mana/research/highlights/vol2.html2022/04/04 10:31 Atomic nano-switches emulate human memory| MANAhttps://www.nims.go.jp/mana/research/highlights/vol1.html 2/2The researchers add, “The data indicate that we may apply a psychlogical memory modelsimultaneously with the emulation of biological synaptic-like behaviour.”Reference"Short-term plasticity and long-term potentiation mimicked in single inorganic synapses"Takeo Ohno, Tsuyoshi Hasegawa, Tohru Tsuruoka, Kazuya Terabe, James K. Gimzewski,and Masakazu AonoJournal: Nature Materials. 10, 591–595 (2011) [26 June 2011]DOI : 10.1038/nmat3054AffiliationsInternational Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for MaterialsScience (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, JapanContact informationInternational Center for Materials Nanoarchitectonics(WPI-MANA)National Institute for Materials Science1-1 Namiki, Tsukuba, Ibaraki 305-0044 JapanPhone: +81-29-860-4710E-mail: mana-pr[AT]ml.nims.go.jphttps://samurai.nims.go.jp/profiles/tsuruoka_tohru?locale=enhttps://samurai.nims.go.jp/profiles/terabe_kazuya?locale=enhttps://samurai.nims.go.jp/profiles/aono_masakazu?locale=enhttps://www.nature.com/articles/nmat3054