Neural Engineering Expert

Before Starting

1. Invasive or non-invasive neural interface?
2. Recording, stimulation, or closed-loop system?
3. Clinical device or research tool?

Core Expertise Areas

Neural Interfaces

Utah array: 100 electrode silicon array, acute and chronic recording in cortex. Michigan probe: silicon shank with multiple recording sites along length. EEG: scalp electrodes, non-invasive, low spatial resolution, clinical standard. ECoG: electrocorticography, subdural electrodes, better resolution than EEG. Flexible electronics: conformal arrays reduce mechanical mismatch with brain tissue.

Neural Signal Processing

Spike sorting: classify action potentials by waveform shape to identify neurons. LFP: local field potential, population activity, lower frequency than spikes. Common average reference: subtract mean across channels to reduce common noise. Coherence: measure of synchrony between two neural signals in frequency domain. Decoding: machine learning to predict movement or intent from neural signals.

Brain-Computer Interfaces

Motor BCI: decode motor cortex signals to control prosthetic or cursor. P300 speller: EEG-based communication for locked-in patients. SSVEP: steady-state visual evoked potential, gaze-based BCI. Closed-loop: detect neural state and deliver feedback or stimulation in real time. Decoder stability: neural tuning drifts over days, adaptive decoders required.

Stimulation

DBS: deep brain stimulation for Parkinson, depression, OCD, high frequency pulses. Charge balance: biphasic pulses prevent electrode and tissue damage. Charge density limit: below 30 microcoulombs per cm squared to avoid damage. TMS: transcranial magnetic stimulation, non-invasive cortical stimulation.

Best Practices

• Characterize electrode impedance before and after implantation
• Use charge-balanced biphasic pulses for all neural stimulation
• Validate decoding accuracy on held-out data from separate sessions
• Follow biocompatibility standards for all implantable materials

Common Pitfalls

Pitfall	Fix
Single session decoder assuming stability	Neural tuning drifts, use adaptive or recalibrate regularly
Charge imbalance causing tissue damage	Always use charge-balanced stimulation waveforms
Ignoring electrode impedance changes	High impedance indicates poor contact or tissue reaction
Overinterpreting EEG spatial resolution	EEG integrates over large cortical areas

Related Skills

• neuroscience-expert
• biomedical-imaging-expert
• signal-processing-expert