Very trivial technical details 🤓

General information

  • Location: EEG LAB #1, Max Planck Institute for Empirical Aesthetics.
  • Address: GrĂĽneburgweg 14, 60322 Frankfurt am Main, Germany.
  • Acquisition period: 2025-11-12 to 2026-04-XX.

EEG Chamber

  • Booth: IAC Acoustics (IAC already stands for Industrial Acoustics Company; Germany office: IAC GmbH, Mönchengladbach), two-wall Electrically Shielded Metal Booth, 2.53 m x 2.73 m, complying ISO 8253 standard (Acoustics—Audiometric test methods) https://www.iacacoustics.global/audiology-test-rooms/audiology-booths/
  • Air conditioning (not working during the recordings!)
  • Lighting: dimmable LED spotlight (GU5.3 MR16 7.5W 621 lm 3000K, dimmable down to 10% without flickering)

Stimulus Presentation System

PC

Video

  • Video card: ASUS ROG STRIX-GTX1050-O2G-GAMING (GDDR5 2 GB, r. 2016)

  • In-chamber monitor: XL2402Z (BenQ, Taipei, TW), 24-inch, 1920 x 1080 pixels^2, 91 ppi, W-LED, viewing angles = 170/160 degrees [H/V], brightness = 350 cd/m^2, refresh rate = 24–144 Hz, min response time = 1 ms

Audio

  • Sound card: FireFace UCX (RME Audio, DE), connected via USB 2.0

  • Software mixer: TotalMix FX (RME Audio, DE)

  • In-chamber loudspeakers: KH120A studio monitors (Georg Neumann GmbH, DE), frequency range = 52 Hz – 21 kHz (+/- 3 dB), maximum output = 112.2 dB SPL, 50 watt power

User input

  • Trackball mouse: Expert Mouse (Kensington Computer Products Group, USA), wired, USB, 4 bottons and a scroll ring, 1000 DPI, black and blue colours

Network

  • No internet, only the central intranet to access the project disks (“P-drive”) in the Windows file server

EEG system

Electrodes

  • ActiCAP-snap 32-channel active electrodes (Brain Products GmbH). https://www.brainproducts.com/solutions/acticap/
    • Electrode type: active gel electrode with Ag/AgCl (silver/silver chloride) pellet
    • Electrode diameter: ~5.5 mm (snap holder: 2 mm)
    • Dynamic range: ± 1000 mV

Amplifier

Control box

  • ActiCAP ControlBox II (BrainProducts; r. 2011): controlling and powering active electrode units.

EEG cap

  • Easycap EEG Recording Cap (Brain Products GmbH).
    • Cap type: Subtemporal
    • Cap cut: C-cut (Caucasian cut) [cf, A-cut: Asian cut for round heads]
    • Cap fabrics: High Precision (adults)
    • Cap sizes: 54, 56, 60 cm (circumference)
  • EEG wire braiding style: 2 pigtails (instead of 4 pigtails).

Impedance check system

Acquisition software

Consumables

  • SuperVisc (Easycap GmbH): highViscosity Electrolyte-Gel for Active Electrodes

  • Syringe & blunt needle:

EXG system

Electrodes & Sensors

  • Multirode ring electrode B18 (Easycap GmbH): Ag/AgCl

  • 3D Acceleration Sensor (Brain Products GmbH): range = ±2 g, output = 1400 mV, gain = 1450 mV/g ± 10%, dimensions = 22 x 14 x 8 mm^3, weight = 8 g.

  • GSR Sensor (Brain Products GmbH): constant = 0.5 V, measurement range = 1–100 µS, gain = 25 mV/µS, output range = 0.01–4.71 V, dimensions = 15 x 36 x 36 mm^3, weight = 30 g.

  • Respiration Belt (Brain Products GmbH):

  • Blood Pulse Sensor (Brain Products GmbH):

  • Photo Sensor (Brain Products GmbH):

  • StimTrack (Brain Products GmbH):

Amplifier

  • 1x BrainAmp ExG (Brain Products GmbH).
    • 16 bipolar channels
    • 2 bipolar ground channels
    • 8 auxiliary channels
    • DC recording is possible (i.e., no high-pass filter)

Consumables

  • NuPrep Skin Prep Gel (Walter)

  • Disinfectant: 70% isopropyl alcohol

  • Cotton swabs

  • Cotton pads

  • Disposable gloves

  • Adhesive rings for ring electrodes (3M?)

  • ECG adhesive rings for children (20 mm x 8 mm)

  • Kendall ECG Ag/AgCl Electrode (H135SG; CardinalHelth), 43 mm x 35 mm, with snap connector

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