Ni daq 6216

Intracochlear ECoG recordings were conducted through the HiRes90K CI system (Advanced Bionics, Stafa, Switzerland). The Bionic Ear Data Collection System research software (BEDCS, Advanced Bionics, Stafa, Switzerland) was used. The BEDCS was connected to the CI through the Clarion Programming Interface (CPI, Advanced Bionics, Stafa, Switzerland) and the Platinum Series Speech Processor (Advanced Bionics, Stafa, Switzerland). The amplifier on the HiRes90K CI was configured to have a gain of 1000. The sampling rate was 9,280 Hz. The low pass filter was set at 5,000 Hz. The most apical contact of the HiFocus Mid-Scalar electrode array was used as the recording electrode, the ring electrode as reference electrode.
The acoustic stimulus was generated by a NI DAQ system (NI DAQ 6216, National Instruments Corporation, Austin, TX, U.S.A.) along with an audio amplifier (Sony PHA-2, Sony Corporation, New York, NY, U.S.A.). The sound was presented through ER-3A insert earphones (Etymotic Research Inc., Elk Grove Village, IL, U.S.A.). As acoustic stimulus, a sinusoidal tone burst at 500 Hz with a level of approximately 110 dB SPL was used. The CPI delivered an external trigger to synchronize stimulus generation and ECoG recording through the CI. The recordings were acquired either continuously (S77) or stepwise (S48, S52) during insertion of the CI electrode.

The equipment used for data collection was previously described by Koka et al. (2016 (link)). The Bionic Ear Data Collection System (BEDCS) was used to measure ECochG responses. A NI DAQ system (NI DAQ 6216, National Instruments Corporation, 11500 Mopac Expwy, Austin, TX) and an audio amplifier (Sony PHA-2, Sony Corporation, New York, NY) were used to generate the acoustic stimuli, which was presented through an ER-3A (Etymotic Research, Inc. 61 Martin Lane, Elk Grove Village, IL) insert earphone. An ER-7 (Etymotic Research, Inc. 61 Martin Lane, Elk Grove Village, IL) probe microphone was used to calibrate and monitor the stimulus level in the ear canal. The ECochG response was measured using an AB Clinical Programming Interface Platinum Series Sound Processor (PSP) and Universal Headpiece (UHP) with additional magnets for retention and secure connection.

The AC and BC stimulus delivery and measurement system for assessing behavioral thresholds and ECochG responses was the same as that described in Koka et al. (2016 (link)). The Bionic Ear Data Collection System (BEDCS) research software of Advanced Bionics was used to control stimulus delivery and ECochG measurement. The acoustic stimuli were generated by an NI DAQ system (NI DAQ 6216, National Instruments Corporation„ Austin, TX) along with an audio amplifier (Sony PHA-2, Sony Corporation, New York, NY, USA) and presented through a ER-3A insert earphone (Etymotic Research, Inc., Elk Grove Village, IL USA) for AC and through a B-71 bone vibrator for BC. The AC and BC levels were calibrated according to ANSI S3.6 Specifications for Audiometers using clinical audiometric calibration services provided by Audiometrics (Arcadia, CA, USA). ECochG was measured using an Advanced Bionics Clinical Programming Interface (CPI-II), Platinum Series Sound Processor (PSP), and Universal Headpiece (HP). The CPI-II delivered an external trigger to synchronize acoustic/bone vibration stimulus generation and ECochG measurement through the implant.