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Bio-Integrating Optoelectronics, Neural Interfaces, and Computation
Bio-Integrating Optoelectronics, Neural Interfaces, and Computation
The cellular and vascular biology of brain-machine interfaces and neuromodulation, with bidirectional translation between mechanism and device, biology and engineering, bench and clinic.
Directed by Takashi D.Y. Kozai, Ernest E. Roth Professor of Bioengineering, University of Pittsburgh.
Kozai TDY*, et al. Solving the Problem of Inception: A cross-species perspective on strategies for a mechanistic refinement of intracortical microstimulation. Journal of Neural Engineering. 2026.
What We Actually Do
What We Actually Do
We study how cortical tissue responds to chronic perturbation, using implanted neural interfaces and a multi-modal neuromodulation toolkit as instruments for questions in adult cortical plasticity, glial and vascular biology, and the cellular failure modes that connect brain-machine interfaces to neurological disease.
For the engineering and translational scientist. Brain-machine interfaces fail in tissue, and materials science alone cannot explain or fix it. We pair parametric in vivo perturbation with longitudinal two-photon imaging and chronic electrophysiology to characterize the device-tissue interface across rodent, NHP, and human preparations, in close collaboration with the Pitt human BCI program and clinical neuromodulation partners. [ Engineering and Translation ]
For the neuroscience and glioscience student. Chronic implantation, combined with the optogenetic, chemogenetic, transgenic, and pharmacological toolkit of contemporary neuroscience, gives experimental access to adult cortical glial and vascular plasticity that other in vivo preparations cannot match. We use this access to ask whether myelin remodels on behavioral timescales, what mural cells do under perturbation, how microglia maintain homeostasis under chronic input, and how oligodendrocyte progenitors respond to injury and activity. [ Basic Biology ]
For the disease-focused quantitative scientist. The glial and vascular failure modes around implanted devices are mechanistically continuous with multiple sclerosis, Alzheimer's disease, traumatic brain injury, and stroke. Parametric stimulation in healthy adult cortex provides controlled, longitudinal access to neuroinflammation, myelin remodeling, neurovascular uncoupling, and oligodendrocyte vulnerability that disease preparations cannot deliver. [ Disease Connections ]
Research Architecture, Two Coupled Axes
Research Architecture, Two Coupled Axes
The lab's research is organized along two coupled axes that share methods, trainees, and scientific motivation.
Axis 1, Tissue-Device Biophysics. How does the brain respond to implanted devices and exogenous perturbation (electrical, ultrasonic, optical, chemogenetic, pharmacological) at the cellular and vascular level? We characterize the biological cascades that determine device performance over chronic timescales, with the goal of producing mechanism that informs device design, stimulation parameter selection, and clinical deployment.
Axis 2, Glial and Vascular Neurocomputation. What computational roles do astrocytes, oligodendrocytes, microglia, and the cerebrovasculature play in healthy brain function, learning, and disease? We map these contributions using two-photon imaging, chronic electrophysiology, electrochemistry, and computational modeling, to build mechanistic accounts of cortical function that extend beyond the neuron-centric view of neural circuits.
The axes are bidirectionally coupled. Observations from Axis 1, how implants and parametric stimulation perturb glial and vascular systems, generate hypotheses that Axis 2 tests in basic biology terms. Findings from Axis 2 specify what Axis 1 must engineer to advance the device-tissue interface and the clinical applications it enables. Most papers from the lab contribute to both axes simultaneously, and trainees develop the experimental and reasoning skills to operate across both (philosophy).
(see details)
Who Will and Will Not Thrive Here
The lab fits students and postdocs from biology, engineering, physics, applied math, and computational backgrounds who want to work at the interface of basic glial and vascular biology, contemporary neuroscience, and translational neural engineering, with a willingness to develop competence across multiple in vivo perturbation and readout modalities.
The lab is not the right fit for trainees whose primary interest is descriptive immunohistochemistry of foreign body response, terminal histology as a primary endpoint, or device fabrication without the underlying tissue biology. The field has moved beyond descriptive characterization of glial scarring as a primary scientific question.
For complementary interests within Pitt, students focused on electrode and device design should consider Dr. Tracy Cui's lab, and students focused on human BCI clinical research should consider Drs. Jennifer Collinger and Robert Gaunt. The B.I.O.N.I.C. Lab partners closely with these programs and is the right home for trainees whose questions live in the cellular and vascular biology that determines whether those devices and human BCIs ultimately succeed or fail.
Trainee Outcomes
Trainee Outcomes
Every graduate student trained in the lab has secured external fellowship or scholarship funding during their PhD, a 100 percent rate sustained across or scored highly competitively with applications pending. Fellowships have included 2x NSF GRFP, 2x NIH F31, 1x NIH F99, 2x NIH F31 pending. Domestic postdoctoral trainees have secured T32s and F32s.
The lab trains deliberately for both academic and industry careers, and alumni have placed in academic positions and industry research positions at neural interface and medical device companies (including Zoetis and Blackrock Neurotech). The choice of track is the trainee's, and the core skill set, mechanistic depth at the engineering-biology interface paired with multi-modal neuromodulation, longitudinal in vivo readout, and computational analysis, opens both pathways without forcing early commitment.
How We Work
How We Work
The two-axis architecture above describes the lab's scientific structure. This section describes how the lab moves between the axes and across preparations.
The lab operates a deliberately bidirectional translational program. Forward, mechanism from Axis 2 informs device design, stimulation parameters, and clinical deployment in Axis 1, through industry and clinical collaborations. Reverse, the chronic devices and parametric stimulation of Axis 1 serve as instruments for the basic biology of Axis 2.
The preclinical rodent preparation is the lab's mechanistic platform, paired with the multi-modal toolkit. Conditional knockouts, transgenic reporters, chronic two-photon windows, and parametric stimulation at proper sample sizes are the experimental access that produces mechanistic claims. Trainees extend rodent-derived findings into NHP and human collaborations through the Pitt human BCI program (Drs. Collinger and Gaunt) and other clinical partners as projects mature.
The Toolkit
The Toolkit
The lab pairs a broad in vivo perturbation toolkit (intracortical microstimulation, focused ultrasound with microbubbles, optogenetics, DREADDs, conditional and transgenic genetic tools, pharmacology) with longitudinal readouts (two-photon and multiphoton imaging across weeks to months, chronic single-unit and multi-unit electrophysiology, behavioral readouts, computational and biophysical modeling, quantitative immunohistochemistry as terminal validation). Trainees develop competence in 2 to 3 perturbation modalities and 2 to 3 readout modalities, selected to match the scientific question rather than prior specialization.
Beyond the Lab
Beyond the Lab
Industry translation. Dr. Kozai founded Fontis Biotechnology as a graduate student and declined a co-founder position at Neuralink in 2016 on scientific grounds. The lab maintains active engagement with the neural interface industry, and trainees benefit from internships, introductions, and post-graduation placement support.
Public engagement and science policy. The lab contributes to national science policy through Senate Labor-HHS appropriations testimony, the National Security Commission on Emerging Biotechnology, and engagement with NIH, NSF, FDA, and ARPA-H. Dr. Kozai writes the "Why BCIs Fail" series on LinkedIn and Substack.
Institutional role. Dr. Kozai is a lead faculty organizer of UP NExT, an Associate Editor at the Journal of Neural Engineering, and a member of committees serving three deans and the Senior Vice Chancellor for Research.
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