Neuroengineering

A core knowledge base framework covering principles, methods, and applications.

Neuroengineering sits at the intersection of neuroscience, computation, and materials science. This outline serves as a living document to map out the physical devices, mathematical models, and biological principles used to interface with and understand the nervous system.

🧭 What Is Neuroengineering? 📅 IDNE 701 Timeline (Fall 2026) 🏛️ IDNE 702 Timeline (Spring 2026) 📖 View Neuroengineering Glossary

Neural Signal Acquisition

Non-Invasive Modalities Recording brain activity from outside the skull.
- Electroencephalography (EEG) High temporal resolution, low spatial resolution signal of cortical activity.
- Magnetoencephalography (MEG) Captures magnetic fields generated by neural currents; less sensitive to head geometry compared to EEG.
Invasive & Implantable Interfaces High-fidelity recordings bypassing the skull limit.
- Electrocorticography (ECoG) Electrodes placed directly on the exposed surface of the brain.
- Local Field Potentials (LFP) Signals indicating the summed electrical current flowing from multiple nearby neuron groups.
- Single-Unit / Multi-Unit Activity (SUA/MUA) Capturing action potentials using microelectrode arrays.

Brain-Computer Interfaces (BCI)

Decoding Algorithms Translating neural signals into command outputs.
- Kalman filters and linear models for continuous motor control.
- Machine learning approaches (SVMs, Temporal CNNs) for distinct intent recognition.
Applications Using BCIs for restoration and augmentation.
- Motor prosthetics and robotic limb control.
- Communication systems (e.g., P300 speller, speech decoding).
- Sensory restoration (e.g., visual or cochlear implants, retinal prostheses).

Neuromodulation

Electrical Stimulation Direct modulation of neural circuits.
- Deep Brain Stimulation (DBS) Surgically implanted electrodes for conditions like Parkinson's, Essential Tremor, and Epilepsy.
- Transcranial Direct/Alternating Current Stimulation (tDCS / tACS) Non-invasive sub-threshold current delivery to modulate cortical excitability.
Magnetic & Emerging Modalities Alternative ways of influencing neural dynamics.
- Transcranial Magnetic Stimulation (TMS) Inducing targeted electrical currents using rapidly changing magnetic fields.
- Focused Ultrasound (FUS) Focused acoustic energy for targeted, non-invasive deep brain neuromodulation or ablation.
- TMS vs. Focused Ultrasound Side-by-side comparison of the two non-invasive modalities, physics, focality and depth, mechanism, dose parameters, safety and evidence.

Neuroimaging & Brain Mapping

Magnetic Resonance Imaging (MRI) Structural and functional brain mapping.
- Functional MRI (fMRI) Assessing brain function via Blood Oxygen Level-Dependent (BOLD) contrast.
- Diffusion Tensor Imaging (DTI) Mapping white matter tracts and structural connectivity (connectomics).
- Magnetic Resonance Spectroscopy (MRS) Probing the chemical composition of tissue.
Metabolic & Optical Imaging Specialized imaging techniques.
- Positron Emission Tomography (PET) Examining metabolic activity and receptor ligand binding.
- fNIRS Functional Near-Infrared Spectroscopy for portable hemodynamic monitoring.
- Optical Neuroimaging & Bedside Hemodynamics (IDNE 701 Week 6 Lecture, Slides, and Demo Lab).
- Preliminary Design Review Rubric (IDNE 701 Week 7 Milestone PDR).
- Signal Acquisition & K-Space Dynamics (IDNE 701 Week 8 Lecture & Slides).
- Image Reconstruction & ML Biomarkers (IDNE 701 Week 9 Lecture & Slides).
- Artifact Mitigation & Motion Correction (IDNE 701 Week 10 Lecture & Slides).
- High-Density EEG Core Protocol (IDNE 701 Week 11 Core Lab Visit).
- Safety Physics & FDA Strategy (IDNE 701 Week 12 Lecture & Slides).
- Virtual Prototyping & Clinical IRB Protocols (IDNE 701 Week 13 Lecture).
- Grand Pitch Symposium Guidelines (IDNE 701 Week 14 Final Milestone).

Tissue & Materials Engineering

Biomaterials Developing biocompatible interfaces.
- Conductive polymers (e.g., PEDOT:PSS) for flexible electrodes.
- Hydrogels and encapsulation materials to minimize glial scarring and foreign body response.
- Coatings and packaging for electrodes to ensure long-term viability and insulation.
Neural Tissue Engineering Repairing and replacing neural tissue.
- Scaffolds for axonal guidance and spinal cord injury repair.
- Stem cell therapies and neural organoids for disease modeling and transplantation.

Neuro-Devices & Hardware

Soft & Flexible Electronics Matching the mechanical properties of neural tissue.
- Stretchable, conformal electrode arrays adapting to the brain's curvature.
- Minimizing immune response and micromotion artifacts over chronic implant periods.
Bioinspired & Biomimetic Sensors Hardware designed to replicate biological functions.
- Neuromorphic sensors mimicking biological vision and hearing.
- Artificial sensory skin allowing haptic feedback for neuro-prostheses.
- Synaptic transistors and artificial ion channels for analog signal integration.

Computational Modeling

Network & Tissue Dynamics Simulating nervous system functions mathematically.
- Leaky Integrate-and-Fire (LIF) and Izhikevich neuron models.
- Hodgkin-Huxley formulations modeling the squid giant axon.
- Large-scale brain network models (e.g., The Virtual Brain framework).

Background & Deep Dives

What Is Neuroengineering? Seven competing definitions, presented for argument.
- The strongest case and the real cost of each position, from "applied neuroscience" to the institutional account.
- An interactive matrix testing all seven against eleven cases, plus discussion questions for seminar.
- Seminar opener slide deck with facilitator notes and timings.
History & Interactive Timeline The evolution of neuroengineering.
- From the first EEG in 1924 to modern intracortical arrays and endovascular BCIs.
Major Players & Stakeholders The industry landscape.
- Startups, established medical device companies, and research consortia.
- Links and profiles on Neuralink, Synchron, Blackrock, Medtronic, and others.
The Commercial State of Neurotechnology What is actually available today?
- FDA-approved clinical implants (DBS, Cochlear, RNS).
- Direct-to-consumer EEG headsets, tDCS wearables, and sleep trackers.
The Story of Cochlear Implants Pioneering sensory restoration.
- Historical development from single-channel to multi-channel implants.
- Tonotopic mapping and the psychology of hearing restoration.
iBCI & Speech Decoding Current state of invasive Brain-Computer Interfaces.
- High-density intracortical microelectrode arrays (e.g., Utah arrays, Neuropixels).
- Real-time kinematic control vs. the shift toward decoding phonemes/words for locked-in patients.
Deep Dive: Spinal Cord Repair The quest to bridge the nervous system.
- Epidural Electrical Stimulation (EES) and digital bridges.
- Biological scaffolds and axonal sprouting.
Neuroethics The moral and societal implications of neurotechnology.
- Privacy of neural data and the concept of "mental privacy."
- Agency, identity, and the impacts of closed-loop stimulation parameters on personality.