Electrophysiology Laboratory

The electrophysiology laboratory is 996 sq ft and houses the high-density EEG recording systems in three 10'x8' and one 10'x10' electrically-shielded sound-attenuated booths. Each booth is equipped with auditory, visual and somatosensory stimulus delivery equipment, high resolution eye-link eye-tracker (model 2000) and head rest, and a direct feed video camera (for subject monitoring) are also inside the booth.

EEG systems
The laboratory contains a total of six EEG recording systems for human recording.

• Four BioSemi EEG instrumentations with three 168-channel and one 72-channel systems.
• One Advanced Neuro Technology (ANT) instrumentation with a 128-channel system.
• One Brain Products instrumentation with a 128-channel system.

The wide range of recording equipment enables the lab to record EEG data from a wide of the population from babies to adults with great ease.

BioSemi EEG Specifications
High-density amplifier with a 72-to-168-channel system, a maximum sampling frequency of 2048 Hz, DC amplifier, 24-bit resolution. The electrode inputs are shielded with the electrode signal itself (active-noise cancellation). Active electrodes ensure a disturbance free measurement and have the effect that 50/60Hz interference and artifacts due to movement of cables are reduced to a minimum.

ANT EEG Specifications
High-density amplifier with a 128-channels systems, a maximum sampling frequency of 2048 Hz, 22 bit resolution (71.5 nV per bit), input impedance > 10^12 Ohm, fiber optic connection to PC, active electrodes for interference and artifacts reduction.

Brain Products EEG Specifications
High-density amplifier with a 128-channels systems, a maximum sampling frequency of 5000 Hz, DC amplifier, 16-bit resolution. EEG amplifiers are equipped with number noise reduction techniques such as active noise cancellation and active electrodes.

Super-Grid EEG Specifications
The Super-Grid was specifically designed EEG-Cap by ANT for our laboratory to measure with high spatial resolution. The application is mainly intended for the occipital area covering a area of approximately 10 cm in diameter with 128 electrodes.

Eye Tracking Specifications
The laboratory has three EyeLink 1000 eye-trackers for accurate detection of eye-movements. These systems can determine eye position at a sampling rate up to 2000Hz with a resolution of up to 0.01° of visual angle. They can be either used with a head rest in “Head Supported” mode or without chin rest in “Head Free” mode. The “Head Free” mode is especially suited in populations in which a head rest or head mount is not desirable, but high accuracy and resolution are still important. Setting up and calibrating the eye-tracker usually takes 2-5 minutes.