BioSemi ActiveTwo Protocol
Complete EEG Study Guide
A comprehensive, step-by-step guide for conducting EEG studies using the BioSemi ActiveTwo system. From participant preparation to data cleanup.
30-45 min setup2 researchers recommended64/128 channel
EEG Signal
10 uV/div1 sec
Fz
Cz
Pz
Oz
Live
256 HzEquipment Checklist
Gather all materials before beginning the study session
BioSemi ActiveTwo System
EEG Cap (appropriate size)
Electrodes (64 or 128 channel)
SignaGel or similar conductive gel
Blunt-tip syringes (10-20ml)
Measuring tape (for head circumference)
Alcohol prep pads
Cotton swabs
Towels and tissues
Chin strap (optional)Optional
Electrode gel applicator sticksOptional
Reference/ground electrodes
Cap Size Guide
Measure head circumference at the widest point (above eyebrows, around occipital protuberance)
| Size | Circumference | Typical Use |
|---|---|---|
| Extra Small | < 52 cm | Young children |
| Small | 52-54 cm | Children, small adults |
| Medium | 54-58 cm | Most adults |
| Large | 58-62 cm | Large adults |
Important Precautions
Screen for contraindications before each session:
- History of epilepsy or seizures
- Open wounds or skin conditions on scalp
- Recent head injury
- Metal implants in head/neck area
- Allergies to electrode gel or adhesives
Best Practices
- Ask participant to avoid hair products on study day
- Have participant arrive with dry hair
- Schedule adequate time for setup (45+ min)
- Prepare all equipment before participant arrives
- Keep room at comfortable temperature
- Minimize electronic interference sources