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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11A reliable EEG experiment begins with the signal you need to measure: that determines sensor placement, reference, bandwidth, sampling rate, and quality checks. There is no universal electrode count, impedance cutoff, or sampling rate. Choose and document settings for the specific question, follow your equipment’s instructions, and inspect the raw signal before recording.
Start with the research question
Define the target signal, its frequency range, the timing precision the analysis needs, and the planned analyses before choosing hardware settings. A montage designed to observe broad scalp patterns is different from one focused on a particular region or event. More electrodes do not compensate for poor contact or an unsuitable reference.
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For human scalp EEG, a documented placement framework such as the International 10–20 system helps make sensor locations consistent. Record the montage and channel count so another team can reproduce the setup. In multisite studies, use the same preparation checklist, participant instructions, acquisition settings, and event triggers at each site; standardization is central to the recommendations in the 2017 multisite EEG standardization paper.
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Choose and prepare the sensors
Match electrode type to the preparation method
Document the electrode type and prepare it according to the device and electrode manufacturer’s instructions. Conductive gel is appropriate for gel-based electrodes; do not assume it belongs in the procedure for dry or other sensor designs. Keep cable routing and scalp preparation consistent, and check contact for every channel.
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Check contact without treating one threshold as universal
Impedance criteria depend on the amplifier and electrode system. The 2023 IFCN/ILAE routine and sleep EEG standards suggest scalp impedance below 5 kΩ and consider below 10 kΩ acceptable for the routine clinical context they address. These figures are not a device-independent rule for every research setup. Use the acquisition system’s guidance and record the criterion you applied.
Give particular attention to the reference and ground contacts: a problem there can affect the recording beyond a single sensor. Before starting the task, inspect live raw traces for noise, drift, saturation, and channels that behave unexpectedly. Processed traces alone can conceal acquisition problems. Practical preparation and live-signal checks are also covered in Ten quick tips for clinical EEG acquisition (2024).
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Set reference and ground deliberately
EEG channels measure voltage differences relative to a reference. Ground has a separate electrical role; it is not another name for the reference. Confirm both assignments in the acquisition software and device manual, then report them in the experiment record.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsReference choice affects what can be interpreted and changed later. The 2017 AES/ILAE task-force report discusses differential recording as a way to improve signal-to-noise ratio and referential recording as a way to retain flexibility for later re-montaging. That flexibility depends on the recorded reference remaining clean and within the amplifier’s range: a noisy or saturated reference can compromise channels or prevent useful offline re-montaging. Monitor reference quality during acquisition and explain why the chosen reference fits the analysis.
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Choose sampling rate and filters for the signal
Begin with the highest frequency component you intend to analyze and the temporal detail you need. The Nyquist criterion requires sampling at more than twice the highest frequency represented, and practical acquisition guidance can call for additional headroom. An anti-alias filter must suppress frequencies above the usable band before digitization; otherwise, higher-frequency content can appear as false lower-frequency signal.
Published example rates apply to specific contexts, not every EEG study:
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- The 2023 IFCN/ILAE routine EEG standard proposes a minimum of 256 Hz for the clinical frequency content it addresses.
- A 2025 human ERP protocol recommends 512 Hz for that protocol.
- The 2017 AES/ILAE task-force report gives practical guidance of at least four times, and ideally eight to ten times, the maximum signal frequency in its electrophysiology acquisition discussion. This is not a universal human scalp-EEG standard.
Higher sampling rates increase storage and processing demands. If you downsample, low-pass filter first to prevent aliasing, and document both the original and final sampling rates along with the filter settings. Preserve raw data where feasible so later analyses can revisit acquisition choices.
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Use a pre-recording acquisition checklist
- Define the design: Write down the research question, target bandwidth, timing needs, and planned analyses.
- Document the montage: Record electrode type, channel count, locations, reference, and ground. Use a consistent placement framework when appropriate.
- Prepare and verify contacts: Follow the electrode system’s instructions; check each channel and pay special attention to reference and ground.
- Inspect raw live signals: Look for noise, drift, saturation, and channel problems before the task begins.
- Set digitization: Choose sampling and anti-alias filtering for the target bandwidth. If downsampling, filter first.
- Synchronize and record procedures: Verify event markers, synchronize video when relevant, keep participant instructions consistent, and preserve raw data where feasible.
- Report acquisition choices: State electrode type and locations, reference and ground, sampling rate, filters, any downsampling, and event synchronization so the setup can be assessed and reproduced.
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