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[[Vol. 74]Artificial Retinal Device Mimics Human Optical Illusions_ WPI-MANA.pdf](https://mdr.nims.go.jp/filesets/6f2f5591-5cb9-4608-a6de-c597716a933e/download)

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International Center for Materials Nanoarchitectonics (WPI-MANA)

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[[Research Highlights Vol.74] Artificial Retinal Device Mimics Human Optical Illusions](https://mdr.nims.go.jp/datasets/a13bfec0-3fc1-4c08-ad49-e3b452d31bda)

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2022/03/31 16:05 Artificial Retinal Device Mimics Human Optical Illusions| MANAhttps://www.nims.go.jp/mana/research/highlights/vol74.html 1/2Previous  Index  NextResearch Highlights[Vol. 74]Artificial Retinal Device Mimics Human Optical Illusions10 Mar, 2022A team at WPI-MANA has developed the first-ever artificial retinal device that increasesthe edge contrast between lighter and darker areas of an image, using ionic migrationand interaction within solid. The device has the potential for use in developing compact,energy-efficient visual sensing and image-processing hardware systems capable ofprocessing analog signals.Recently artificial intelligence (AI) system developers have shown much interest in research onvarious sensors and analog information-processing systems inspired by the human senses. Most AIsystems require sophisticated software and complex circuit configurations, including custom-designed processing modules. The problem with these systems is that they are large and consumemuch power.The team built a multiple ionic device system, each of which had a lithium cobalt oxide channelarranged on a common lithium phosphorus oxynitride electrolyte. Because of the migration of Li-ions between the channels through the electrolyte, the devices were highly interactive, similar tohuman retinal neurons such as photoreceptors, and horizontal and bipolar cells. Input voltagepulses caused ions within the electrolyte to migrate across the channels, which changed the outputchannel current.The device was able to process input image signals and produce an image with increased edgehttps://www.nims.go.jp/mana/research/highlights/vol73.htmlhttps://www.nims.go.jp/mana/research/highlights/index.htmlhttps://www.nims.go.jp/mana/research/highlights/vol75.html2022/03/31 16:05 Artificial Retinal Device Mimics Human Optical Illusions| MANAhttps://www.nims.go.jp/mana/research/highlights/vol74.html 2/2contrast between darker and lighter areas. This is similar to the human visual system’s ability toincrease edge contrast between brightness differences by means of visual lateral inhibition.The human eye produces various optical illusions associated with tilt angle, size, color andmovement, in addition to darkness/lightness, and this process is believed to play a crucial role inthe visual identification of different objects. The artificial retinal device the team created could beused to reproduce these types of optical illusions. They hope to develop visual sensing systemscapable of performing human retinal functions by integrating their device with other components,including photoreceptor circuits.This research was conducted by Tohru Tsuruoka (Chief Researcher, Nanoionic Devices Group, WPI-MANA, NIMS), Kazuya Terabe (MANA Principal Investigator, Group Leader, Nanoionic DevicesGroup, WPI-MANA, NIMS) and their collaborator.Reference“Neuromorphic System for Edge Information Encoding: Emulating Retinal Center-SurroundAntagonism by Li-Ion-Mediated Highly Interactive Devices”Xiang Wan, Tohru Tsuruoka, and Kazuya Terabe.Journal: Nano Letters 2021, 21, 19, 7938-7945 (13 September 2021)DOI : 10.1021/acs.nanolett.1c01990（MANA E-BULLETIN）https://www.nims.go.jp/mana/ebulletin/AffiliationsInternational 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/tsuruoka_tohru?locale=enhttps://samurai.nims.go.jp/profiles/terabe_kazuya?locale=enhttps://doi.org/10.1021/acs.nanolett.1c01990https://www.nims.go.jp/mana/ebulletin/