An Instant Donning Multi-Channel EEG Headset (with Comb-Shaped Dry Electrodes) and BCI Applications

We developed a new type of electroencephalogram (EEG) headset system with comb-shaped electrodes that enables the wearer to quickly don and utilize it in daily life. Two models that can measure EEG signals using up to eight channels have been implemented. The electrodes implemented in the headsets are similar to a comb and are placed quickly by wiping the hair (as done with a comb) using the headset. To verify this headset system, donning time was measured and three brain computer interface (BCI) application experiments were conducted. Alpha rhythm-based, steady-state visual evoked potential (SSVEP)-based, and auditory steady state response (ASSR)-based BCI systems were adopted for the validation experiments. Four subjects participated and ten trials were repeated in the donning experiment. The results of the validation experiments show that reliable EEG signal measurement is possible immediately after donning the headsets without any preparation. It took approximately 10 s for healthy subjects to don the headsets, including an earclip with reference and ground electrodes. The results of alpha rhythm-based BCI showed 100% accuracy. Furthermore, the results of SSVEP-based and ASSR-based BCI experiments indicate that performance is sufficient for BCI applications; 95.7% and 76.0% accuracies were obtained, respectively. The results of BCI paradigm experiments indicate that the new headset type is feasible for various BCI applications.

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The Usefulness of Sound-Field Auditory Steady State Response (SF ASSR): Comparison of Hearing Sensitivity and Typical ASSR

Audiology and Speech Research ◽

10.21848/audiol.2013.9.1.15 ◽

2013 ◽

Vol 9 (1) ◽

pp. 15-24

Author(s):

Eun Sun Park ◽

Junghwa Bahng ◽

Hyo-Jeong Lee ◽

Hyung-Jong Kim

Keyword(s):

Steady State ◽

Sound Field ◽

Steady State Response ◽

Hearing Sensitivity ◽

State Response ◽

Auditory Steady State Response

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The Auditory Steady-State Response: Full-Term and Premature Neonates

Journal of the American Academy of Audiology ◽

10.1055/s-0040-1715969 ◽

2002 ◽

Vol 13 (05) ◽

pp. 260-269 ◽

Cited By ~ 10

Author(s):

Barbara Cone-Wesson ◽

John Parker ◽

Nina Swiderski ◽

Field Rickards

Keyword(s):

Steady State ◽

Premature Infants ◽

Modulation Frequency ◽

Otoacoustic Emission ◽

Full Term ◽

Steady State Response ◽

Pass Rates ◽

Term Infants ◽

State Response ◽

Auditory Steady State Response

Two studies were aimed at developing the auditory steady-state response (ASSR) for universal newborn hearing screening. First, neonates who had passed auditory brainstem response, transient evoked otoacoustic emission, and distortion-product otoacoustic emission tests were also tested with ASSRs using modulated tones that varied in frequency and level. Pass rates were highest (> 90%) for amplitude-modulated tones presented at levels ≥ 69 dB SPL. The effect of modulation frequency on ASSR for 500- and 2000-Hz tones was evaluated in full-term and premature infants in the second study. Full-term infants had higher pass rates for 2000-Hz tones amplitude modulated at 74 to 106 Hz compared with pass rates for a 500-Hz tone modulated at 58 to 90 Hz. Premature infants had lower pass rates than full-term infants for both carrier frequencies. Systematic investigation of ASSR threshold and the effect of modulation frequency in neonates is needed to adapt the technique for screening.

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The Auditory Steady-State Response

Journal of the American Academy of Audiology ◽

10.1055/s-0040-1715960 ◽

2002 ◽

Vol 13 (04) ◽

pp. i-i

Author(s):

James Jerger

Keyword(s):

Steady State ◽

Steady State Response ◽

State Response ◽

Auditory Steady State Response

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Decreased Gamma Auditory Steady-State Response Is Associated With Impaired Real-World Functioning in Unmedicated Patients at Clinical High Risk for Psychosis

Clinical EEG and Neuroscience ◽

10.1177/1550059420982706 ◽

2020 ◽

pp. 155005942098270

Author(s):

Sarah Ahmed ◽

Jennifer R. Lepock ◽

Romina Mizrahi ◽

R. Michael Bagby ◽

Cory J. Gerritsen ◽

...

Keyword(s):

Steady State ◽

High Risk ◽

Functional Impairment ◽

Real World ◽

Steady State Response ◽

Clinical High Risk ◽

State Response ◽

Auditory Steady State Response ◽

Gamma Synchrony ◽

40 Hz

Aim Deficits in synchronous, gamma-frequency neural oscillations may contribute to schizophrenia patients’ real-world functional impairment and can be measured electroencephalographically using the auditory steady-state response (ASSR). Gamma ASSR deficits have been reported in schizophrenia patients and individuals at clinical high risk (CHR) for developing psychosis. We hypothesized that, in CHR patients, gamma ASSR would correlate with real-world functioning, consistent with a role for gamma synchrony deficits in functional impairment. Methods A total of 35 CHR patients rated on Global Functioning: Social and Role scales had EEG recorded while listening to 1-ms, 93-dB clicks presented at 40 Hz in 500-ms trains, in response to which 40-Hz evoked power and intertrial phase-locking factor (PLF) were measured. Results In CHR patients, lower 40-Hz PLF correlated with lower social functioning. Conclusions Gamma synchrony deficits may be a biomarker of real-world impairment at early stages of the schizophrenia disease trajectory.

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