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 World's Most Popular Biofeedback Site

A- I       2 channel Pocket HEG/EEG
 $944 plus $45 shipping (anywhere in the world)  total $989 and add the Neurofeedback Foundations 12 hour Video Course for $229, another $40 savings

Or, New: Go Wireless, which is great for Use with Bio-Explorer and HEG combination, for $100 more. (order the A-1W)

Add Bio-explorer software for $425

Add HEG for $499


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The A-I combines EEG biofeedback and HEG biofeedback. EEG biofeedback uses electrical signals generated by the brain to train cognitive response to stimuli. HEG biofeedback uses light signals to measure relative levels of oxygenation of blood flows in the brain & to train elevation of these levels.

Use it as...

  • a Walkman - feedback is chimes & tones
  • a DVD remote control - feedback is control over 'play' & 'pause'
  • a Pod - acquires eeg & heg signals for PC-based biofeedback software: BioExplorer

Set EEG protocols for a range of up-training, down-training and ratio protocols, independantly for each channel. Operate either one or two channels EEG/HEG, or both simultaneously.


For EEG, pure silver electrodes. Ear-clip electrodes for neutral & reference electrodes, and conventional cup electrodes for the Active1 and Active2 electrodes. To operate one channel, the Active2 electrode is not used. Also configure a one channel ‘bipolar montage’ (ie the difference between the Active1 and Active2 electrodes). Touchproof electrodes? An adaptor is available. For HEG biofeedback, a special HEG headset is supplied as an optional extra.


And use Binaural Beats to promote relaxation & release of tension. ('Binaural Beat’ presents a tone to one ear which is at a slightly different frequency to the tone presented to the alternate ear.)


Choose from a large number of Presets, simplifying operation whilst allowing users to override, making the unit very flexible. Save your settings as one of three User-defined Presets. EEG protocols, HEG fine tuning, audible feedback mechanisms, and binaural beat sessions may all be programmed by the user.


Monitor progress both within a session (by visible displays of recent history), and from session to session (by time & date stamped records of session variables). 


And more....

  • automatically detect corrupt signals including
    • EMG ‘muscle’ artefact  (in the band 100 to 200Hz)
    • EEG electrode offset voltage
    • EEG low signal  (excessive 50/60Hz interference)
    • EEG excessive signal  (likely displacement of EEG electrode)
  • seek out benign 50/60Hz environments with a special 'divining' mode
  • inject randomised noise as a EEG/HEG signal (for blind studies or demos)
  • select Automatic Level Control  & auto-scaling of displays
  • select ‘anti-pinking’ filters for flattening the spectrum of EEG signals
  • set the real-time alarm clock: timer shut-down/power-up
  • 7+ hours continuous operation with 2 x AA NiMH rechargeable batteries
  • reprogram the firmware by downloading a file over the net



A-2 Pocket  EEG (not currently available)  $844 plus $45 shipping total $889 and add the Neurofeedback Foundations 12 hour Video Course for $229, another $40 savings

 New the A-1 Pocket EEG with HEG capability  It's the same price as the A-2, but it offers 2 channels of EEG and HEG capability ($500) instead of AV capabilities and 4 channels of Saline electrode EEG.

Standalone  4 channel Brain Trainer / sound light Mind Machine

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An extraordinary new product first exhibited at the Futurehealth Miami Winter Brain meeting. 
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-a stand-alone 4 channel EEG you can put in your pocket.
-microprocessor based with LCD screen-- not just numbers but animated graphics and more
-Sound and light stim, with some aspects linked to EEG (in new ways that do not violate existing patents)
-session data storage
-infrared link to computer for data download. 
binocular rivalry based on gratings & stereoscope
-saline electrodes that are electronically "conditioned" to improve signal quality
-synchrony training
Electrodes Kit   $75 (no shipping charge when ordered with system.)

This kit consists of an additional 4 sets of electrodes (a total of 25 electrodes & 24 foam inserts). At average use, this represents a minimum 12 months supply.

 Consumables Kit   $125

This kit consists of two Electrode Kits (see above) together with an additional   semi-flexible Headband, Pacifier & Nicad battery. At average use, this represents a 24 months supply.

More Details

  • 4 channel neurofeedback with integrated light & sound and binocular rivalry technologies
  • pocket-sized with large LCD display
  • lines of code: 30,000
  • 11-13 preset configurations, three of which are user programmable
  • each eeg channel has 8th-order anti-alias filter
  • eeg channel bandwidth: selectable - 35/40/45/60 Hz
  • selectable automatic level control on eeg signals
  • selectable 'anti-pinking' filter on eeg signals
  • 14-16 separate screens on large LCD display
  • auto-scaling in time-domain & frequency domain displays
  • light & sound: user-programmable 8-segment sequencer
  • each l&s segment programmable for tone, beat, l&r level, pink noise, duration
  • hi-intensity blue LED light glasses with switchable left-right eye or left-right field of vision
  • fft analysis for frequency displays & fast 8th-order digital filtering for eeg protocol analysis
  • 1 of 8 wanted/unwanted bands individually selectable on each of eeg channels
  • 'rewards': chime, chord or continuously variable pitch tone
  • reward threshold: auto adjust using inference engine
  • synchrony: cross-correlation of 4 eeg channels
  • eeg electrodes: no-mess, saline-solution, silver-plated w. electronic pacifier
  • binocular rivalry with logging of switching rate & sway using Necker Cube
  • continuous monitoring of electrode offset potential in most displays
  • logging: protocol outcomes, both @ 30sec intervals (short-term history) & user-determined (non-volatile)
  • upload of logged data to PC
  • infrared link: bidirectional to other Abhayamudra units or to PC for mixing eeg signals (Abh II)
  • real-time clock: facilitates time-stamped logging of readouts, & power-up/down by time-of-day alarm
  • rechargeable battery operation: >5 hrs continuous
  • hardcopy user manual
  • buy 3 or more -> optional personalised 'sign-on', & set your own protocol bandwidths


General   4-ch EEG monitor and neurofeedback with integrated Binaural Beat generator, flashing LED glasses and binocular rivalry monitor
EEG Channels 4 x monopolar + reference + neutral, or 2 x bipolar + neutral (strappable)
  A->D Sampling Rate 8.196mSec (~122.07 Hz)
  A->D Resolution 10-bit precision, accuracy 9-bits or better
  Anti-aliasing filter Switched capacitor 8th order elliptic (r=1.2) LPF each channel, fc=programmable
  3dB bandwidth 0.5 – 35/40/44Hz (60Hz countries) selectable
  CMRR >95dB
  Channel gain V/V: fixed 20k, or independently Ch1/2, Ch3/4 10k-40k in 64 steps under ALC (+-20%* absolute, +-2% ch to ch)

(+- 2% absolute to order); * digital potentiometer spec

  Driven Right Leg Sum of ch common mode, mains hum suppression, current limited to IEC 60601
  Probe health measure Measure of 2nd stage dc offset compensation, each channel separately
  Electrodes 6 x 80-160u" silver plated casings surrounding saline impregnated sponge

Expected life: >3 months usage

  Connector 8-way Modular
Binaural Beat Generator General 2048 16-bit unsigned cosine lookup table with interpolation

9 preset, 1 user programmable carrier frequencies, 10 preset volume settings (L & R)

9 preset, 1 user programmable beat frequencies

monaural pink masking noise, 10 preset volume settings

all in up to 8 sequences, each up to 9 minutes in 1 minute increments, or loop forever

  Programmable Carrier Frequency Range 0.0 – 999.9Hz, 0.1Hz precision, 0.125Hz accuracy
  Programmable Beat Frequency Range 0.0 – 99.9Hz, 0.1Hz precision, 0.125Hz accuracy
  Preset Carrier Freqs 65.8, 73.6, 165, 197, 246, 393, 440, 492, 526 Hz
  Preset Beat Freqs 0, 1.2, 4.4, 6.6, 9.9, 13.2, 19.8, 26.3, 39.5 Hz
  Pink Noise algorithm Pinkish filter – 3dB/octave on white noise (summation of staggered 1st order filters (also 4 octave Voss-McCartney to order)
  White Noise algorithm Linear congruential (seed=16457), (15-bit linear feedback shift register to order)
  D->A Sampling Rate 3.90625kHz
  D->A Resolution 8-bit
  D->A filtering Switched capacitor 8th order elliptic (r=1.2) LPF each channel, fc=1670Hz
  Audio 3dB Bandwidth 80 – 1670 Hz
  Headset impedance > 30 ohms
  Audio connector 3.5mm stereo
Light glasses LEDs 2 x 4 high intensity blue
  Modes Left eye – right eye, or Left field of vision – right fov (selectable on glasses)

Sync flash – alternate L & R flash (selectable on unit)

  Connector 4-way modular/3.5mm stereo (I); 8-way modular (II)
Binocular Rivalry Abh II Display Left ocular field – vertical lines moving left

Right ocular field – horizontal lines moving down

  Abh I Display Necker Cube
  L-R Discriminator Converging tubes 40mm dia, 33cm long
  Eye Alternation Rate 0.0 – 2.9 Hz, 0.1 Hz resolution
Presets   11 (I): setupEEG, focus, relax, release, intuit, sleep, theWorks, external, user defined (3 off); +2 (II): setup Probes, setup SigGen
Modes Binaural Beat Probes & feedback tones off
  EEG Binaural Beat off, chimes or chords feedback tones
  EEG+Binaural Beat Chimes reward only, superimposed on Binaural Beat tones
  EEG+Beat+Sweep Binaural Beat frequency sweeps between peak EEG and target brainwave frequency,

L/R chosen dynamically based on lower instantaneous threshold value

Displays General 64x128 pixel chip-on-glass graphic display, menu controlled contrast adjustment
  Menus Rolling and scrolling menus and submenus
  Probes Display Time domain Ch 1&2 or Ch 3&4, uVolt readout, auto scaling analog gain/digital gain w. readout; linear Y axis, Ch 1&2 or Ch 3&4 Probes d.c. offset readout
  Frequency Display Frequency Domain 0 – 60Hz , 1/f compensated, Ch 1&2 or Ch 3&4, log Y axis, auto scaling analog gain/digital gain w. readout, probes status
  Mirror Display Left/Right Hemisphere Brain Mirror Ch ½ or ¾, Bands: delta, theta1, theta2, alpha, beta1, beta2, gamma, pseudo log Y axis, R/S ratio values, probes status
  Coherency Display Phase space display of peak reinforce & suppress band for previous ~120 FFTs Ch 1&2 or Ch 3&4, R/S ratio values, probes status
  Centricity Display Spatial mean for Ch1 Reinforce band applied to Ch 1/2/3/4, maker size reflects R/S ratio amplitude for each channel, R/S ratio values, probes status
  Halleys Display Bat length is determined by R/S ratio for Ch 1/2/3/4 (left top, left bottom, right top, right bottom resp., counts success in deflecting ball, R/S ratio values, probes status
  Binaural Beat Display Sequence number, left frequency, right frequency, beat frequency, left volume right volume, pink noise level, time remaining, R/S ratio values
  EEG Log Display Previous 64 smoothed R/S values sampled each ~30sec, or

Previous 32 logged R/S values Ch 1&2 or Ch 3&4

  Synchrony Display Instantaneous & smoothed values of complex cross-correlation of FFT phasors in Ch1 reinforce band reflected over Ch1<>2, 2<>4,1<>3, & 3<>4, Range –1.0 to 1.0
  Samadhi Display Eyelids response to reinforce band amplitude and R/S ratio resp, Ch 1&2 or 3&4, R/S ratio values, probes status
  Synchrony Log Display Previous 64 smoothed Xcorel. Values sampled each ~30sec, or

Previous 32 logged Xcorel. Values, Ch F&B or Ch L&R

  Eye Rivalry Display Left ocular field – vertical lines moving left

Right ocular field – horizontal lines moving down

Left-right dominance % readout, eye switching rate readout Hz, auto boost flag

  Eye Rivalry Log Previous 64 smoothed dominance & sw rate values sampled each ~30sec, or

Previous 32 logged dominance & sw. rate values

  Impedance (AbhayamudraII only) Measurement of a.c. impedance of individual electrode-scalp impedances at 30Hz. Range: 0..125Kohm ± 2K ohm. Auto calibration feature.
  Signal Generator

(AbhayamudraII only)

2-tone mode: F1 & F2: 0.0..49.9Hz, 0.0..39.9uVpp*, individually settable

Sweep mode: Flo & Fhi: 0.0..49.9Hz, 0.0..39.8uVpp*, rate 0..59 seconds

Protocol General Select reinforce & suppress band for each of 4 channels. R&S can be any of delta, theta1, theta2, alpha, beta1, beta2, beta3, or gamma. R/S calc based on digital filters (~65mSec response), X-correlation calcs & displays based on FFT (130+mSec response)
  Artefact Suppression Delta change in Spectral energy measured & compared with threshold -> inhibit reward
Digital Filters General Elliptic 4th order BPF, 2nd order Direct Form II cascade implementation with Q15 format coefficients, 10-bit data
  Delta 3dB Bandwidth 0.6 – 3.0 Hz, pass 0.7dB, reject 48dB
  Theta 1 3dB BW 3.5 – 4.8 Hz, pass 0.1dB, reject 49dB
  Theta 2 3dB BW 5.7 – 7.6 Hz, pass 0.1dB, reject 48dB
  Alpha BW 8.5 – 10.7dB, pass 0.1dB, reject 48.5dB
  Beta 1 BW 11.8 – 15.0 Hz, pass 0.1dB, reject 48dB
  Beta 2 BW 17.2 – 21.5 Hz, pass 0.1dB, reject 48dB
  Beta 3 BW 24.5 – 34.0 Hz, pass 0.1dB, reject 44dB (53dB @ 50Hz)
  Gamma BW 38.0 – 43.0 Hz, pass 0.1dB, reject 44dB (60dB @ 50Hz)
FFT General 1:N input overlapped, raised-cosine windowed, scaling 8-bit Radix2 (8 – 256 points), 2-ch (Ch A real, Ch B imaginary), in-place, complex FFT
  Overlap 4:1
  Points 64
  Window Pseudo Hamming raised cosine
  Lookup table 64 point signed 8-bit cosine table
  Power Spectrum Pseudo power spectrum using coeff magnitude as proxy
Aural Reward Dynamic threshold Reward triggered by fuzzy logic inference engine – inputs are current R/S ratio, R/S ratio history, time duration to previous reward hit. No manual setup required.
  (i) Chords 2048 16-bit unsigned cosine lookup table, monaural, Base=440Hz, 3rd=550Hz, 5th= 660Hz, 7th=825Hz; ADSR=50/150/600/200mSec resp (not available in Bbeat mode)
  Algorithm (menu selectable) Chord: any 1 R/S->chord 1,any 2->chd 1+2,any 3->chd 1+2+3,all 4->chd 1+2+3+4

ChordSync: any 1 Xcorel->chord 1 etc

  (ii) Chimes .wav files for lo, lo-med, med, med-hi, & hi
  Algorithm (menu selectable) R/S LF OR LB(L)/RF OR RB(R), LF AND LB(L)/RF AND RB(R)

Sync: LFLB Xcorel.-> chime1(L),RFRB->chime2(R), LFRF->chime3(L+R), LBRB->chime4(L+R)

  (iii) Continuously variable pitch Pitch varies in accordance with R/S
  Algorithm Left channel: Ch1 or C3; Right channel: Ch2 or Ch4

Sync: Left channel: Ch LF-RF or Ch LF-LB, Right channel: LB-RB or RF-RB

Electrode Impedance Meter

(Abh II)

Measurement technique Inserts 30.5Hz signal into Neutral electrode and measures individual signals on other five electrodes. Current is limited to IEC 60601 values plus margin. Measurement is sequenced through five electrodes with four cycles of 30.5Hz for each measurement -> ~0.625 sec for each pass. Two measurement points allows discrimination of Neutral & other electrode impedance.
  Measurement range Sum of each of electrodes in series with Neutral electrode < 256K W in 1K W steps. (eg if Neutral electrode is 50K W , maximum measurement for other electrodes is 205K W )
  Accuracy: Reference electrode Uncal: ± 3K W ; Cal: ± 1K W
  Accuracy: Ch1..4 electrodes Uncal: ± 4K W ; Cal: ± 2K W
  Accuracy: Neutral electrode Uncalibrated: unspecified; Calibrated: ± 10K W
  Calibration Utilizes external eeg cable termination (supplied)
m Volt Signal Generator

(Abh II)

General Utilizes external passive attenuator (supplied)

Frequency range: sine wave, 0.1..49.9 Hz

Frequency accuracy: ± 0.1Hz

Amplitude range: 0.0..39.9 m Voltp-p

Amplitude accuracy (@ 0.0..30.0uV; 1..49Hz): ± 0.5m Voltp-p

(includes coupling capacitor pre-compensation)

Amplitude accuracy @ 0.1Hz: -50%

  Sweep Mode Single tone of amplitude set 0..40m V sweeping between f1 & f2, each selected in band 0..50Hz, at a selectable sweep period of 0..59 secs. Note some combinations of sweep breadth & sweep period will be below minimum sweep rate of 0.5Hz/sec causing sweep to not proceed beyond f1.
  Two-tone mode Two constant tones each individually programmed frequency 0..50Hz and amplitude 0..40 m Voltp-p
Infrared Link

(Abh II)

General Frame consists of sync/data byte + 2/4 channel data bytes (Tx & Rx). 6-bit data alternates between status & command info. Rx data may add to or replace locally generated data, 2 x 9-bit samples in burst, then window to receive burst, if no receive then use local data
  Protocol Pseudo ping-pong, peer-to-peer,
  Peak wavelength 870nm
  Rx sensitivity 62.5nA (~40-200nA to order)
  Range ~50cm
  Format 1 start, 8 data, pseudo even parity*, 1 stop; *9th bit: no parity error=0, error=1
  Rate 38k4 Baud
  Synchronisation Count 0..3 (prefix of each sync/data byte at start of frame)
  Status Info Left/Rigth button, Ch1/2/3/4 probe status
  Commands Pause/resume, 2/4 ch, ALC on/off, EEG local/remote/mix, 8-bit,9-bit(parity) word
Real Time Clock Format HH:mm (24 hr) DD:MM, auto day of month & leap year corrections
  Alarm Matching HH:mm; if unit operating-> turn off, if off-> resume at previous settings
  Accuracy ~± 4min/month (~± 30sec/month to order)
Test Mode General Menu selection of test mode, except for strappable selection of left/right earpiece tones insertion into Ch 1/2 or ¾ for EEG hardware testing
  EEG bandwidth 62.5Hz (to observe induced mains hum), 1/f compensation removed
  Left/Right earpiece 7.63/3.815 Hz square wave resp. (to ensure headphones orientation is correct)
MultiTasking Dispatcher Startup thread Power up control
  Menu thread Controls scrolling of menus, input of config. commands, execution of commands
  Main thread Controls main program loop: fft, dig filters etc, when unit active
  Go thread Controls inputs when unit active
  COP thread Controls servicing of watchdog timer when unit is active (reset upon software error)
  Activity thread Controls unit shut down in absence of regular inputs (power save)
  Bitbang thread Controls slow serial port control of peripherals (dig pot) (noise reduction)
  Stop thread Controls power down of unit
Power Managemnt Power consumption < 100mA @ nom 3.6Vall times, <100uA in power down
  Battery 3.6V Nicad, 600mAH
  On-time >5 Hrs continuous, >1 month in power down (after overnight charge)
  Battery life ~ 1 year, regular use, regular charging.
  Charging 6-12Vdc >100mA charger, 20mA trickle (overnight full charge)
  Operational measures Disable unit upon charging, "Lo-bat" flash, power down after 5min. idle timeout when in startup mode, after 2 min in menu mode, after two hours 15min whilst operating, "place on charger" warnings
  Connector 1.3mm power jack, positive centre pin
Case General Active components fully enclosed by case (except connectors) - no exposed metal parts
  Material ABS GSM UL rated 94 HB plastic, ~2mm.

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