Baby-EEG lab

The baby EEG lab provides EEG equipment specifically geared to experiments with babies and toddlers.

Relevant documentation

• An extensive protocol for how to measure infants’ EEG in this room is available here: Running a Baby EEG experiment. Includes information on testing infants of 4, 12 and 20 months old, and also includes information on how to test infants in the ‘adult’ EEG lab K.13.
• Information for parents.
• Headcaps overview
• Biosemi manual for handling the electrodes

Relevant lab user meetings

• Babylab meetings, every Friday, at 10:30h (except during the summer).
• Biolab user meetings

Technical specs

Biosemi Analog-To-Digital (AD) boxes

ActiveTwo MkII Analog-to-Digital-box: EEG (details)

• For recording cortical responses or electroencephalography (EEG)
• Compatible with pin or flat-type active electrodes
  • ‘Active electrodes’ entails that signal amplification occurs very near the recording site (minimal inference)
• Amplification is via direct current coupling (DC coupling)
• Both type of electrodes have a build-in high-pass filter (this is needed to prevent aliasing)
  • fifth-order filter that is -3 dB at 1/5th of sample-rate (e.g. 3.3kHz at 16kHz sample rate or speedmode 7/9)
• LSB for standard electrodes is 31.25 nV (1/32th microvolt)

Graph shows the signal diminishing. One equals the dynamic sample rate (e.g. 16 kHz). Taken from the Biosemi website.

Graph shows the signal diminishing. One equals the dynamic sample rate (e.g. 16 kHz). Taken from the Biosemi website.

ActiveTwo MkII Speedsettings

AD-box switch

Sample-rate

Pin channels + EX channels + Sensor channels

0	Daisy-chain mode:In speedmode 0 to 3, the AD-boxes work as up to 4 optical fiber ‘daisy chained’ boxes, each with a maximum of 128+8 channels+sensors @ 2 kHz, speedmode switch = box number. (0=Box1, 1=Box2, 2=Box3, 3=Box4). Daisy chain mode requires an extra fiber input to be installed on the front of the AD-box. (Not done at the ILS Labs. equipment)
1
2
3
4	2048 (2 kHz)	256+8+7
5	4096 (4 kHz)	128+8+7
6	8192 (8 kHz)	64+8+7
7	16384 (16 kHz)	32+8+7
8 (AIB-mode)	2048 (2 kHz)	256+8+7+32AIB
9 (ABR-mode)	16384 (16 kHz)	5

BioSemi equipment

• Two 64-channel electrode sets: C1+2, and D1+2.
• Three 32-channel electrode sets: E, F and G.
• Four black drawstring electrode bags with black cords and cord stoppers in various colors and shapes. A spare black cord can be found in the drawer where the electrode bundles are stored when they’re dry.
  • Note: bundles are shared with K.13, so they might be located there. Please coordinate this with any other EEG experiment currently running
• Headcaps overview
  • Note: headcaps are also shared between K.02 and K.13
• Biosemi manual for handling the electrodes

Internal equipment (in the test room)

• 21,5″ LCD (TN panel) Iiyama B2283HS (native 1920 x 1080 at 60Hz, response time 2ms),
• (optional) keyboard
• (optional) buttonbox
• 3x Genelec 1029A speakers 10-80 W rms
  • 2x for stereo (L and R speakers)
  • 1x for summed-mono (C speaker)
• Logitech c920 Webcam
• Intercom system

External equipment (in the control room)

• Recording PC GW-LAB-BL-EEG-1 (Dell 3640):
  • Single monitor on desk: 1 x iiyama Prolite E2273HDS 22″ (1920×1080)
  • Single (portable) monitor in cabin: 1 x Asus 15″ ZenScreen (1920×1080)
  • Windows 10 64-bit or Ubuntu Mate 20.04
  • 16GB DDR4 (2x8GB) RAM
  • Intel Core i5-10500 CPU
  • Intel HD Graphics 620
  • Connected to webcam inside cabin

• Presentation PC GW-LAB-BL-EEG-2 (Dell 3640):
  • Dual monitor setup (vertical): 2 x iiyama Prolite E2273HDS 22″ (1920×1080)
  • Windows 10 64-bit or Ubuntu Mate 20.04
  • 16GB DDR4 (2x8GB) RAM
  • Intel Core i5-10500 CPU
  • Intel HD Graphics 620
  • 1 Parrallel port card
  • Creative Soundblaster Audigy 5/Rx (Sound card)
  • BioSemi I/O Card: optical out, ActiveTwo usb receiver
• Intercom Panel
  • Including MP3 player for parent audio masking

Room details

• Room number: K.02

Usage rules

Keeping the facilities in this lab in the best possible condition requires your cooperation; please read the house rules and stick to them. Especially important:

• Never ever change or remove any wiring; don’t pull out any plugs
• No eating or drinking (except coffee, tea, water)
• Clean up
• Ask for help, report all problems