A computer interface for psychophysical and speech research with the Nucleus cochlear implant

Area of Science:

• Biomedical Engineering
• Neuroscience
• Computer Science

Background:

• Cochlear implants (Cochlear Corporation) require precise stimulus control for research.
• Existing clinical interfaces and speech processors offer limited experimental flexibility.
• Need for advanced computer-controlled stimulus delivery in cochlear implant research.

Purpose of the Study:

• To design and implement a computer interface for delivering biphasic pulse stimuli to cochlear implant patients.
• To enable advanced stimulus control for psychophysical, electrophysiological, and speech experiments.
• To overcome limitations of current speech processors and clinical interfaces.

Main Methods:

• Developed a computer interface connecting via PC parallel port or bus slot.
• Host computer transmits byte streams specifying pulse configuration (amplitude, pulse width, timing).
• Interface generates burst sequences delivered to the patient's external transmitter coil.

Main Results:

• Successfully implemented a computer interface for biphasic pulse stimulus presentation.
• Enabled precise control over stimulus parameters, including interleaving pulses and amplitude/timing modulation.
• Facilitated stimulus sweeping across the electrode array for detailed investigation.

Conclusions:

• The developed interface provides unprecedented stimulus control for cochlear implant research.
• Enables novel psychophysical, electrophysiological, and speech experiments previously not possible.
• Significantly advances the capabilities for investigating auditory perception and neural responses in CI users.