Graeme Clark Collection

Permanent URI for this collection

http://hdl.handle.net/11343/375

Filters

1983 - 1989 1 1990 - 1996 1
2 1
Reset filters

Settings
Statistics
Citations
End date: 1999 × Subject: cochlear implant × Subject: electrical stimulation × Subject: otolaryngology × Subject: safety studies ×

Search Results

Now showing 1 - 2 of 2
  • Item
    Thumbnail Image
    Electrophonically driven single unit responses of the anteroventral cochlear nucleus in cat [Abstract]
    Morrison, N. A. ; Brown, M. ; Clark, Graeme M. ( 1996)
    Electrical stimulation of the cochlea results in both direct and electrophonic excitation of auditory nerve fibres. It has been proposed that electrophonic stimulation results from the creation of a mechanical disturbance on the basilar membrane which has properties similar those resulting from acoustic stimuli. Auditory nerve compound action potential (CAP) forward masking studies1 show the level of frequency specific electrophonic stimulation is highly correlated with the spectral energy of the electrical stimulus waveform. The level of spectral energy in pulsatile biphasic electrical stimuli decreases toward low frequencies suggesting the level of electrophonic stimulation will be diminished in the low frequency region of the cochlea.
  • Item
    Thumbnail Image
    Current distributions in cochlear stimulation
    Black, R. C. ; Clark, Graeme M. ; Tong, Y. C. ; Patrick, J. F. ( 1983)
    The success of a multiple-channel cochlear implant depends, in part, on localizing the electrical current to discrete groups of auditory nerve fibers. A number of studies are described that were performed to investigate this issue. First, a three-dimensional resistance model of the normal cat cochlea was developed to examine general properties of electrically stimulating the cochlea. The distribution of the excited nerve fibers for monopolar and bipolar stimulation of the cat scala tympani were then determined. In addition certain measurements of the current distribution within the human cochlea for a pseudobipolar electrode array were performed. Finally, measurements were made in saline-solution-filled tube models of current distributions for bipolar and pseudobipolar stimulation, with both single-electrode and coincident multi-electrode stimulation. (From Introduction)