Steps
Step 1
Neurophysiological Function Selection and Experimental Protocol Design
The core task of this step is to select a neurophysiological function topic and design a scientific neurophysiology experiment plan.
• Select research topic: choose from neurophysiology directions—neuronal electrophysiological properties (membrane potential, ion channels, excitability), synaptic transmission and plasticity, sensory information processing, motor control mechanisms, neural rhythms and oscillations, neural circuit dynamics, sleep and wakefulness
• Select experimental system and technique: determine experimental model—in vitro brain slices, in vivo animals (anesthetized/awake), cultured neurons, computational modeling; select techniques—intracellular/extracellular recording, patch-clamp, multi-channel recording (MEA, in vivo multi-channel), EEG/MEG, calcium imaging, optogenetic/chemogenetic modulation, neuropharmacology
• Experimental design: design experimental protocol—determine recording site (cortex, hippocampus, thalamus, etc.), recording mode (whole-cell, field potential, unit firing), stimulation protocol (electrical, optical, sensory), experimental groups (control, drug, lesion), control settings; develop detailed experimental workflow
Deliverable: Neurophysiology experiment design proposal (research question, experimental system, technique selection, stimulation/recording protocol, grouping design) | Quality standard: Scientific and reasonable experimental design, appropriate technique selection, detailed and feasible plan
Step 2
Electrophysiological Recording Preparation and System Calibration
The core task of this step is to prepare electrophysiological experiments and calibrate recording systems. Neuroelectrophysiology experiments require high standards for equipment and operation.
• Equipment preparation and calibration: set up electrophysiological recording system—patch-clamp amplifier (Axon Multiclamp, HEKA EPC), A/D-D/A converter, micromanipulator (piezoelectric), anti-vibration table, Faraday cage, stimulus isolator; debug system noise (<1pA), grounding and shielding; use pCLAMP, PatchMaster acquisition software
• Specimen preparation: prepare specimens according to experiment type—brain slice preparation (300-400μm thick slices with vibratome, recovery in ACSF), cell culture specimens (primary neurons plated on coverslips), in vivo animals (anesthesia and fixation, craniotomy, recording electrode implantation)
• Electrode preparation: pull glass microelectrodes using microelectrode puller (P-97)—patch-clamp electrodes (3-5MΩ resistance, internal solution filling), extracellular recording electrodes, stimulating electrodes; perform electrode polishing and filling; test electrode resistance and seal success rate
Deliverable: Electrophysiology experiment preparation records (equipment configuration list, specimen preparation protocol, electrode parameters, system test report) | Quality standard: Precise equipment calibration, standard specimen preparation, reliable electrode quality, adequate preparation
Step 3
Electrophysiological Recording and Data Acquisition
The core task of this step is to perform electrophysiological recordings and systematically collect neural electrical activity data.
• Patch-clamp recording: perform whole-cell patch-clamp recording—sealing (GΩ seal), breaking in, recording mode (voltage clamp/current clamp); record basic electrophysiological properties (resting potential, input resistance, membrane capacitance, action potential firing); record synaptic currents (spontaneous/miniature postsynaptic currents sEPSC/mEPSC, sIPSC/mIPSC, evoked postsynaptic currents eEPSC/eIPSC)
• Field potential and unit firing recording: record brain slice field potentials (e.g., hippocampal CA1 fEPSP, population spike) and long-term potentiation (LTP); in vivo multi-channel recording—multi-electrode array (MEA) or in vivo silicon probe recording; collect neuronal unit firing and local field potentials (LFP); perform spike sorting analysis
• Experimental operation and QC: perform pharmacological experiments—perfusion drug application (TTX, APV, CNQX, picrotoxin, etc.), observe drug effects; perform paired-pulse facilitation (PPF), LTP/LTD induction experiments; monitor recording quality (series resistance, seal resistance, baseline stability); keep experiment log; eliminate interference promptly
Deliverable: Electrophysiology raw dataset (patch-clamp/field potential/multi-channel raw data, experiment log, annotation files) | Quality standard: High recording quality, complete data, standard operation, strict QC
Step 4
Electrophysiological Data Analysis and Neural Mechanism Interpretation
The core task of this step is to perform professional analysis of electrophysiological data and interpret physiological mechanisms of neural activity.
• Basic electrophysiological parameter analysis: use Clampfit, MiniAnalysis, Igor Pro software for analysis—passive membrane properties (resting potential, input resistance, membrane capacitance, time constant), action potential properties (threshold, amplitude, half-width, frequency adaptation, afterhyperpolarization), synaptic transmission properties (synaptic current amplitude, frequency, kinetics: rise time, decay time constant, paired-pulse ratio PPR)
• Synaptic plasticity and network activity analysis: analyze LTP/LTD—calculate percent change in fEPSP slope/amplitude, statistics on magnitude and time course of potentiation/depression; analyze neural network oscillations—field potential spectral analysis (power spectrum, coherence analysis), oscillatory phase coupling, neuronal firing phase locking to LFP
• Neural mechanism interpretation: analyze neural mechanisms based on electrophysiological results—ion channel mechanisms (specific channel blocker/activator experiments), pre/post synaptic mechanisms (PPR, CV analysis, quantal analysis), circuit mechanisms (excitation/inhibition balance, feedback/feedforward circuits); build neural function regulatory model
Deliverable: Electrophysiology analysis report (parameter statistics table, example traces, mechanism analysis, model diagrams) | Quality standard: Professional and accurate analysis methods, clear result presentation, in-depth and reasonable mechanism interpretation
Step 5
Neurophysiology Research Report Writing
The core task of this step is to write a neurophysiology research report systematically presenting complete findings of the electrophysiology study.
• Write research report: write following neurophysiology paper standards—abstract, introduction, materials and methods (animals/specimens, equipment, solutions, recording protocol, data analysis methods), results (basic properties → synaptic transmission → plasticity → network activity, progressive depth), discussion (comparison with known literature, physiological significance, mechanism model, limitations), conclusion, references
• Create electrophysiology figures: produce high-quality electrophysiology figures—representative traces (current/voltage traces with clear labels), statistical bar/line charts, LTP time course curves, field potential spectra, neuronal firing raster plots; ensure professionalism and readability of electrophysiology figures
• Functional significance discussion: discuss functional significance of neurophysiological properties—relationship with sensory coding, motor control, learning and memory, information processing; relate to electrophysiological abnormalities in neurological diseases (epilepsy, Parkinson disease, Alzheimer disease); discuss clinical translation value
Deliverable: Neurophysiology research report (PDF format with complete electrophysiology data, mechanism analysis, in-depth discussion), raw data attachments | Quality standard: Substantial report content, reliable data, in-depth analysis, professional discussion, standard format