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Related Concept Videos

Hearing01:31

Hearing

When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...

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Related Experiment Video

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Behavioral Determination of Stimulus Pair Discrimination of Auditory Acoustic and Electrical Stimuli Using a Classical Conditioning and Heart-rate Approach
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Discrimination between sequential and simultaneous virtual channels with electrical hearing.

David Landsberger1, John J Galvin

  • 1Division of Communication and Auditory Neuroscience, House Ear Institute, 2100 West 3rd Street, Los Angeles, California 90057, USA. dlandsberger@hei.org

The Journal of the Acoustical Society of America
|September 8, 2011
PubMed
Summary
This summary is machine-generated.

Cochlear implant users can distinguish between simultaneous and sequential virtual channels (VCs). Differences in perceived pitch may stem from varying excitation spread between stimulation types, not stimulation mode or interval.

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Area of Science:

  • Auditory Neuroscience
  • Biomedical Engineering
  • Speech and Hearing Science

Background:

  • Cochlear implants (CIs) use electrical stimulation of the auditory nerve to restore hearing.
  • Virtual channels (VCs) are percepts created by stimulating adjacent electrodes simultaneously or sequentially.
  • Discrimination between simultaneous and sequential VCs is not well understood.

Purpose of the Study:

  • To investigate the discriminability of simultaneous versus sequential virtual channels (VCs) in cochlear implant (CI) users.
  • To compare discrimination performance across different stimulation modes (monopolar and bipolar + 1) and interpulse intervals (IPIs).

Main Methods:

  • CI users performed discrimination tasks between simultaneous and sequential VCs.
  • Stimulation modes included monopolar (MP) and bipolar + 1 (BP + 1).
  • Sequential VCs varied in interpulse interval (IPI) from 0.0 to 1.8 ms at a 250 pulses per second per electrode (ppse) rate.

Main Results:

  • On average, CI users could reliably discriminate between sequential and simultaneous VCs.
  • No significant effect of IPI or stimulation mode was found on average VC discrimination.
  • Some individuals showed better discrimination with the focused BP + 1 mode.
  • Discrimination ability correlated with electrode discrimination, suggesting a role for spatial selectivity.

Conclusions:

  • CI users can perceptually distinguish simultaneous and sequential VCs.
  • Differences in perceived pitch between VCs may be attributed to the spread of excitation, which was wider for sequential VCs due to higher amplitude requirements for equal loudness.
  • Spatial selectivity influences the perception of sequential VCs.