QUEST HD + STIM

Custom, Programmable, Transcranial Stimulation and EEG/ERP Recordings

The Explorer Quest HD+Stim

Custom, Programmable, Transcranial Stimulation, and EEG/ERP Recordings

Expanding upon the full-featured recording capabilities of the Quest HD, the Quest HD+Stim provides extensive tES capabilities, including tDCS, tACS, tPCS and tRNS.

Our extensive software APIs give you the freedom to experiment with customized and novel waveforms. Modulate experimental stimuli based on your subject’s behavioral/electrophysiological responses with the powerful on-board processing of the Quest HD+Stim.

With all of the mobility and recording features of the Quest HD, the Quest HD+Stim neuromodulators can perform HD tES & record HD EEG in up to 256-channel configurations. The Quest HD +Stim kit comes standard with a Digital I/O module offering 20 additional inputs and outputs to interface with stimulus presentation systems and external devices.

Highlights

All of the mobility and features of the Quest HD
Simultaneous transcranial stimulation and EEG/ERP
Adjustable compliance voltage and current limitation to ensure safety
Closed-loop control of stimulation parameters
Meets safety standards for laboratory and clinical research

Specification	Value
Number of Channels	64 or 256, plus an additional 32 or 64 EMG channels
Analog I/O	up to 28 inputs and 28 outputs
Digital I/O	up to 20 input and 20 outputs, plus 2 strobes
Battery Life	Internal, up to 2 hours; External, 4 – 6 hours
Data Communication with PC	Gigabit Ethernet or Wi-Fi
Dimensions	183mm x 95mm x 36mm
Weight	700g

Specification	Value
Resolution	24-bit
Inferred Noise	<1 μVrms
Common Mode Rejection Ratio	110dB
Input Range Min	± 0.1875 V at a gain of 24
Input Range Max	± 2 V at a gain of 1
Input Impedance	1MΩ, 20pF

Specification	Value
Current Range	100 μA – 15 mA
Compliance Voltage	± 9 V to ± 30 V (configurable)
Pulse Width Min	33.3μs
Bandwidth	DC to 15kHz

Up to 256 channels

of EEG recording and stimulation

7.5 kHz sampling rate

for the highest quality data

Flexible Stimulation – No limits. Arbitrary and complex waveforms.

Selectable stimulation – 256 channels with sub-millisecond switch times. Up to 16 channels of simultaneous stimulation.

REAL-TIME, CLOSED-LOOP CONTROL – PROGRAMMATIC CONTROL. REAL-TIME FEEDBACK. MATLAB & PYTHON

Multi-Modal – Record HD EEG & stimulate with HD tES in a single hardware and software platform.

FLEXIBLE STIMULATION

Unlike many commercially available products, the Quest HD+Stim is not limited to simple waveforms. Stimulation parameters can be updated every 33us, making truly arbitrary waveforms possible.

REAL-TIME, CLOSED-LOOP CONTROL

Experimental configuration and custom stimulation paradigms can be programmed and initiated with unique triggers and controlled in real-time with comprehensive MATLAB and Python APIs.