EEG Sensor SA9305M
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Shipping Cost - 1 @ $25 -Additional $4 ea.
Shipping Method - 2nd Day FedEx International Ship Method - Global Exp
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To record EEG on the Thought Technology Multi-Modality Encoders, use an EEG-Flex/Pro or EEG-Z sensor. The EEG-Z is identical to the EEG Flex/Pro except that it incorporates an automated three-lead impedance checking function.
The EEG sensor detects and amplifies the small electrical voltages that are generated by brain cells (neurons) when they fire. Similarly to muscle fibers, neurons of different locations can fire at different rates. The frequencies most commonly looked at, for EEG, are between 1 and 40 Hz. The EEG sensor records a 'raw' EEG signal, which is the constantly varying difference of potential between the positive and negative electrode, and the software processes that signal by applying a variety of digital filters to the recorded signal, in order to extract frequency-domain information. Note: EEG practitioners call the negative electrode "reference" and the positive electrode 'signal'.
The EEG-Flex/Pro sensor measures microvolts (μV), raw. A normal EEG signal, recorded from the scalp, will have an amplitude between 0.1 and about 200 μV. The raw EEG signal is mainly used to evaluate the quality of the recorded signal and to do artifact rejection. For biofeedback purposes, clinicians will usually want to filter out subsets of the whole EEG bandwidth and measure the real-time changes in the total power generated by all the frequencies in the subset.
EEG Sensor Specifications (SA9305M)
Size (Approx.) - 37mm x 37mm x 12mm(1.45" x 1.45" x 0.45")
Weight - 25g (1 oz)
Input Impedance - 10GΩ in parallel with 10pF
Input Range - 0 – 200μVRMS
Sensitivity - <0.1μVRMS
Bandwidth - 2Hz – 1kHz
CMRR - >130dB
Accuracy - ±0.3μVRMS, ±5% of reading @10°C to 40°C
USA Federal law restricts this device to sale by or on the order of a physician or any other practitioner licensed by the law of the state in which he or she practices to use or order the use of this device.