The ABR (Auditory Brainstem Response) sensor set for the new ActiveThree system is connected to the 6 dedicated sensor inputs and has the possibility to insert stimulus triggers (if no dedicated stimulator is available) in sync with the actual stimulus, for measuring Auditory Brainstem Responses (ABR) without delay. These signals differ from typical EEG signals. ABR’s are smaller in amplitude (only a few tenths of a microvolt) and have higher frequencies (100 Hz to 1 kHz) than standard EEG signals (tens of microvolts, with frequencies from 0.1 Hz to 100 Hz)
The ABR cord has 3 active electrodes for Left, Reference and Right. Standard cable length is 150 cm. The specifications are:

ABR Channels (ABR-L, ABR-R) EX Channels (Left, Ref, Right) sample rate: 16,384 kHz 16,384 kHz Bandwidth: 10 Hz to 5.4 kHz DC to 5.4 kHz AC input range: 16 mV peak-to-peak 400 mV peak-to-peak DC input range: -700 mV to +700 mV -200 mV to +200 mV Noise (full bandwidth): 0.4 uVrms (approx. 2 uVpk-pk) 2.8 uVrms (approx. 15 uVpk-pk) CMRR @ 50 Hz: 140 dB 100 dB Resolution: LSB = 1.95 nV (1/512 uV) LSB = 31.25 nV (1/32 uV)

ABR application note

The Audio Optical cable makes it possible to connect an external analog signal (for example from a PC) to the AUX input of the Active3 AD-box.

With this ActiveTwo accessory, the impedance of the skin can be measured. The GSR exists of 2 passive Nihon Kohden electrodes to induce an oscillator signal synchronized with the sample-rate. Because the BioSemi GSR uses "Lock-in detection", the stimulus-current can be as low as 1uA. The low-current and synchronized oscillator ensure that the biopotential measurements (ECG,EEG,EMG) are not corrupted by the GSR oscillator signal. This sensor input can be retrofitted in AD-boxes with serial Moth16 or newer.

Microphone including table tripod to record audio stimuli and responses. Connects directly to the standard BioSemi ActiveTwo Ergo input on the AD-box. Condenser type microphone with high sensitivity and flat frequency response between 30Hz and 16kHz. Powered by the AD-box via the Ergo input.

Light detector for direct connection to the Ergo input.
The sensor consists of a sensitive PIN diode with integrated trans impedance amplifier. This sensor can be used for measuring visual stimuli simultaneously with the physiological data (EEG). This allows checking the timing accuracy of the used stimulus setup. The Ergo input can be retrofitted in AD-boxes with serial Moth16 or newer.

This Plethysmograph sensor from ADI instruments (MLT1020) uses an infrared photoelectric sensor to detect changes in tissue blood volume. The Plethysmograph sensor directly plugs into the front of the ActiveTwo. Click here for the .pdf specifications of the plethysmograph. The Plethysmograph input can be retrofitted in AD-boxes with serial Moth16 or newer.

Respiration belt SleepSense 1387-kit. Using a piezoelectric crystal, the respiration effort sensor converts chest or abdominal respiration movement to clear, reliable respiration waveforms. Strong reliable signals are available because the respiration belt uses the power-supply from the ActiveTwo system. This sensor input can be retrofitted in AD-boxes with serial Moth16 or newer.

Response switches for direct connection to the Ergo input or Switch input on the AD-box.
These response switches ensure accurate timing of the response moments (pulse is mixed directly with the incoming EEG signals) as well as optimal isolation of the subject (no grounded equipment near the subject). Using the USB trigger port also has good timing, but has the disadvantage of bringing the safety grounds near the subject. Under Windows, it is advisable to only use the PC keyboard (ActiView: function keys F1-F8) for none time critical responses because Windows OS is not a real time operating system. There is no fixed timing relation between incoming data through the USB port (EEG data) and signals coming from the keyboard (subject response). The timing relation between the USB port (EEG data) and the keyboard (subject response) can not be determined precisely under Windows.
The BioSemi Response switches connected to the AD-box will make sure your response timing is accurate and your subject isolation remains optimal !

With this high precision temperature sensor from HP (Agilent 21078A), skin temperatures can be measured. The temperature sensor directly plugs into the front of the ActiveTwo. This sensor input can be retrofitted in AD-boxes with serial Moth16 or newer.
LSB = 0.001 degree Celsius. For example: a value of 37,000 in the file is a temperature of 37 degree Celsius.

Double sided adhesive disks for firm placement of the Active electrodes on the skin. Two sizes are available: 20mm x 8mm or 13mm x 5mm (outside x inside). Both sizes are suited well for BioSemi Flat-type active electrodes.

BioSemi Active electrode holders complete with X-ring. These holders are easily mounted in the headcap, and are designed to hold the pin-type Active electrodes. The holders can be disassembled and relocated in the cap in order to change electrode positions. 11mm, 14mm or 17mm.

Headcap by ECI, empty cap without holes and electrodes, complete with 73 or 128 indication dots for standard electrode positions (the user is free in the selection of the electrode positions). Empty cap with 0 holders.

Headbox with 32 Active TouchProof connectors.

Headbox to connect up to 32 Active TouchProof electrodes to an Active3 AD-box.
- Inputs: 32 x Touchproof connector.
- Outputs: 1 x 68-pole fine pitch female MK3 connector.
- Including 68-pole male to 68-pole male flatcable with MK3 connectors. (30 cm)

This cable connects the stimulation PC (parallel port) with the trigger input/output connector (37 pin female sub-D) of the BioSemi USB receiver. Cable is approximately 4.5 Meters long.

Signa electrode gel by Parker, this gel is advised for EEG measurements.
Signa gel is a low impedance highly conductive gel, specially formulated to maximize contact between the body surface and the Active electrodes, bacteriostatic, non-irritating, non-staining, and non-gritty. Sufficient for approximately 60 different 32-channel measurements.

Special syringe with blunt plastic tip for easy injection of electrode gel in the BioSemi electrode holders. 12cc (enough for a measurement of 32 channels)

Ten20 electrode paste. This paste is advised for ECG/EMG/EOG measurements. Jar of 114 gram.

In-line adapter cable. This cable connects to the 8 EX inputs on the top of the AD-box, and have an active electrode circuitry with standard 1 pole touchproof connector on the other end. Standard passive electrodes (surface or needle) connect to the in-line adapters. Keep the cable between in-line adapter and passive electrode as short as possible to reduce noise (a few cm is optimal).

The BioSemi Trigger Interface cable is able to output 8 parallel bits and interfaces direct to the BioSemi USB Receiver trigger input/output connector.
This cable connects the stimulation PC (USB port) with the trigger input/output connector (37 pin female sub-D) of the BioSemi USB receiver. Cable is 5 Meters long. (USB-C cable)