Explanipedia

Author Correction: Patterned electrical brain stimulation by a wireless network of implantable microdevices Open

Ah‐Hyoung Lee, Ji-Hun Lee, Vincent Leung, L.E. Larson, A. V. Nurmikko · 2025

Neuromorphic Optical Tracking and Imaging of Randomly Moving Targets through Strongly Scattering Media Open

Ning Zhang, Timothy M. Shea, A. V. Nurmikko · 2025

Tracking and acquiring simultaneous optical images of randomly moving targets obscured by scattering media remains a challenging problem of importance to many applications that require precise object localization and identification. In thi…

Patterned electrical brain stimulation by a wireless network of implantable microdevices Open

Ah‐Hyoung Lee, Ji-Hun Lee, Vincent Leung, L.E. Larson, A. V. Nurmikko · 2024

Transmitting meaningful information into brain circuits by electronic means is a challenge facing brain-computer interfaces. A key goal is to find an approach to inject spatially structured local current stimuli across swaths of sensory ar…

A Wireless Network of Implantable Microstimulators for Addressable and Patterned Electrical Brain Stimulation Open

Ji-Hun Lee, Ah‐Hyoung Lee, Vincent Leung, L.E. Larson, A. V. Nurmikko · 2024

Transmitting meaningful information into brain circuits by electronic means is a challenge facing brain-computer interfaces. A key goal is to find an approach to inject spatially structured local current stimuli across swaths of sensory ar…

Author Correction: An asynchronous wireless network for capturing event-driven data from large populations of autonomous sensors Open

Ji-Hun Lee, Ah‐Hyoung Lee, Vincent Leung, Farah Laiwalla, M. A. López-Gordo , et al. · 2024

An asynchronous wireless network for capturing event-driven data from large populations of autonomous sensors Open

Ji-Hun Lee, Ah‐Hyoung Lee, Vincent Leung, Farah Laiwalla, M. A. López-Gordo , et al. · 2024

Versatile On‐Chip Programming of Circuit Hardware for Wearable and Implantable Biomedical Microdevices Open

Ah‐Hyoung Lee, Ji-Hun Lee, Vincent Leung, A. V. Nurmikko · 2023

Wearable and implantable microscale electronic sensors have been developed for a range of biomedical applications. The sensors, typically millimeter size silicon microchips, are sought for multiple sensing functions but are severely constr…

Event-Driven Imaging in Turbid Media: A Confluence of Optoelectronics and Neuromorphic Computation Open

Ning Zhang, Timothy M. Shea, A. V. Nurmikko · 2023

In this paper a new optical-computational method is introduced to unveil images of targets whose visibility is severely obscured by light scattering in dense, turbid media. The targets of interest are taken to be dynamic in that their opti…

An Asynchronous Wireless Network for Capturing Event-Driven Data from Large Populations of Autonomous Sensors Open

Ji-Hun Lee, Ah‐Hyoung Lee, Vincent Leung, Farah Laiwalla, M. A. López-Gordo , et al. · 2023

We introduce a wireless RF network concept for capturing sparse event-driven data from large populations of spatially distributed autonomous microsensors, possibly numbered in the thousands. Each sensor is assumed to be a microchip capable…

Asynchronous Large-Scale Networks for Spatially Distributed Wireless RF Event Sensors Open

Ji-Hun Lee, Ah‐Hyoung Lee, Farah Laiwalla, Vincent Leung, M. A. López-Gordo , et al. · 2022

We describe a wireless RF network for capturing event-driven data from thousands of spatially distributed sensors. As asynchronous devices, each sensor detects events within its local environment. Information acquired by the full network c…

Sub-mm resolution tomographic imaging in turbid media by an ultra-high density multichannel approach Open

Ning Zhang, Quan Zhang, A. V. Nurmikko · 2022

We demonstrate an ultra-high-density source-detector (SD) diffuse optical tomography system scalable to thousands of combinatorial SD pairs per cm 3 of total voxel volume. We demonstrate the imaging of dynamic targets (including phantom ar…

Grasp-squeeze adaptation to changes in object compliance leads to dynamic beta-band communication between primary somatosensory and motor cortices Open

Huy Cu, Laurie Lynch, Kevin T. Huang, Wilson Truccolo, A. V. Nurmikko · 2022

Grasp-Squeeze Adaptation to Changes in Object Compliance Leads to Dynamic Beta-Band Communication Between Primary Somatosensory and Motor Cortices Open

HUY CU, Laurie Lynch, Kevin Huang, Wilson Truccolo, A. V. Nurmikko · 2022

In asking the question of how the brain adapts to changes in the softness of manipulated objects, we studied dynamic communication between the primary sensory and motor cortical areas when nonhuman primates grasp and squeeze an elastically…

Home Use of a Percutaneous Wireless Intracortical Brain-Computer Interface by Individuals With Tetraplegia Open

John D. Simeral, Tommy Hosman, Jad Saab, Sharlene N. Flesher, Marco Vilela , et al. · 2021

Wireless multi-electrode recording of broadband neural signals over extended periods introduces a valuable tool for human neuroscience research and is an important step toward practical deployment of iBCI technology for independent use by …

A method for large-scale implantation of 3D microdevice ensembles into brain and soft tissue Open

Stefan A. Sigurdsson, Zeyang Yu, Joonhee Lee, A. V. Nurmikko · 2020

Wireless networks of implantable electronic sensors and actuators at the microscale (sub-mm) level are being explored for monitoring and modulation of physiological activity for medical diagnostics and therapeutic purposes. Beyond the requ…

A Scalable and Low Stress Post-CMOS Processing Technique for Implantable Microsensors Open

Ah‐Hyoung Lee, Ji-Hun Lee, Farah Laiwalla, Vincent Leung, Jiannan Huang , et al. · 2020

Implantable active electronic microchips are being developed as multinode in-body sensors and actuators. There is a need to develop high throughput microfabrication techniques applicable to complementary metal–oxide–semiconductor (CMOS)-ba…

Challenges for Large-Scale Cortical Interfaces Open

A. V. Nurmikko · 2020

Wireless Ensembles of Sub-mm Microimplants Communicating as a Network near 1 GHz in a Neural Application Open

Ji-Hun Lee, Vincent Leung, Ah‐Hyoung Lee, Jiannan Huang, P.M. Asbeck , et al. · 2020

Multichannel electrophysiological sensors and stimulators, especially those used for studying the nervous system, are most commonly based on monolithic microelectrode arrays. Such architecture limits the spatial flexibility of individual e…

A method for large scale implantation of 3D microdevice ensembles into brain and soft tissue Open

Stefan A. Sigurdsson, Zeyang Yu, Joonhee Lee, A. V. Nurmikko · 2020

Wireless networks of implantable electronic sensors and actuators on the microscale (sub-mm) are being explored for monitoring and modulation of physiological activity for medical diagnostics and therapeutic purposes. Beyond the requiremen…

Home Use of a Wireless Intracortical Brain-Computer Interface by Individuals With Tetraplegia Open

John D. Simeral, Tommy Hosman, Jad Saab, Sharlene N. Flesher, Marco Vilela , et al. · 2019

Individuals with neurological disease or injury such as amyotrophic lateral sclerosis, spinal cord injury or stroke may become tetraplegic, unable to speak or even locked-in. For people with these conditions, current assistive technologies…

Decoding speech from spike-based neural population recordings in secondary auditory cortex of non-human primates Open

Christopher Heelan, Ji-Hun Lee, Ronan O’Shea, Laurie Lynch, David M. Brandman , et al. · 2019

Direct electronic communication with sensory areas of the neocortex is a challenging ambition for brain-computer interfaces. Here, we report the first successful neural decoding of English words with high intelligibility from intracortical…

A shape-memory and spiral light-emitting device for precise multisite stimulation of nerve bundles Open

Hao Zheng, Zhitao Zhang, Su Jiang, Biao Yan, Xiang Shi , et al. · 2019

Decoding Complex Sounds Using Broadband Population Recordings from Secondary Auditory Cortex of Macaques Open

Christopher Heelan, Ji-Hun Lee, Ronan O’Shea, David M. Brandman, Wilson Truccolo , et al. · 2019

Direct electronic communication with sensory areas of the neocortex is a challenging ambition for brain-computer interfaces. Here, we report the first successful neural decoding of English words with high intelligibility from intracortical…

A Software-Defined Radio for Wireless Brain Implants Network Open

Haili Cai, Mustafa Lokhandwala, Joey Zhu, Chester Kilfoyle, Ji-Hun Lee , et al. · 2018

A novel Brain-Machine Interface (BMI) system based on a distributed network of implantable wireless sensors was proposed. Small CMOS "Neurograin" chips (0.5x0.5 mm2) with on-chip antenna are designed to harvest near-field RF energy at ~1 G…

Widespread functional opsin transduction in the rat cortex via convection-enhanced delivery optimized for horizontal spread Open

Zeyang Yu, A. V. Nurmikko, Ilker Ozden · 2017

CED is a reliable and effective method of virus delivery for optogenetic transduction of planar superficial structures, such as the cortex in rats.

Optically Active 3-Dimensional Semiconductor Quantum Dot Assemblies in Heterogeneous Nanoscale Hosts Open

A. V. Nurmikko · 2017

Synthesis of semiconductor nanomaterials by low-cost, solution-based methods is shown to lead to new classes of thin film light emitting materials. These materials have been integrated to demonstrative compact laser device testbeds to illu…

High‐<i>Q</i>, Low‐Threshold Monolithic Perovskite Thin‐Film Vertical‐Cavity Lasers Open

Songtao Chen, Cheng Zhang, Joonhee Lee, Jung Han, A. V. Nurmikko · 2017

A vertical-cavity surface-emitting perovskite laser is achieved using a microcavity configuration where CH₃ NH₃ PbI₃ thin solid films are embedded within a custom GaN-based high-quality (Q-factor) resonator…

Spontaneous dynamics of neural networks in deep layers of prefrontal cortex Open

Andrew S Blaeser, Barry W. Connors, A. V. Nurmikko · 2017

Cortical systems maintain and process information through the sustained activation of recurrent local networks of neurons. Layer 5 is known to have a major role in generating the recurrent activation associated with these functions, but re…

A Photonic Crystal Laser from Solution Based Organo-Lead Iodide Perovskite Thin Films Open

Songtao Chen, Kwangdong Roh, Joonhee Lee, Wee Kiang Chong, Yao Lu , et al. · 2016

Perovskite semiconductors are actively investigated for high performance solar cells. Their large optical absorption coefficient and facile solution-based, low-temperature synthesis of thin films make perovskites also a candidate for light…

Modulating dopamine release by optogenetics in transgenic mice reveals terminal dopaminergic dynamics Open

Yao Lu, Nicolette Driscoll, Ilker Ozden, Zeyang Yu, A. V. Nurmikko · 2015

Dopamine (DA) release and uptake dynamics in the nucleus accumbens (NAc) have important implications for neurological diseases and mammalian animal behaviors. We demonstrate here the use of cell-type-specific optogenetic targeting in conju…

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