Methods and systems for lowering a pitch sensation as perceived by a cochlear implant patient

1. A method comprising:

identifying, by a sound processor, a most apical electrode included in a plurality of electrodes disposed within a cochlea of a patient;

directing, by the sound processor, a cochlear implant communicatively coupled to the plurality of electrodes to apply one or more anode-cathode biphasic stimulation pulses to the most apical electrode during a stimulation period, wherein the one or more anode-cathode biphasic stimulation pulses each comprise a positive first phase followed by a negative second phase; and

directing, by the sound processor, the cochlear implant to apply one or more cathode-anode biphasic stimulation pulses to a plurality of other electrodes included in the plurality of electrodes during the stimulation period, wherein the one or more cathode-anode biphasic stimulation pulses each comprise a negative first phase followed by a positive second phase;

wherein the one or more anode-cathode biphasic stimulation pulses and the one or more cathode-anode biphasic stimulation pulses are equivalent in pulse width.

2. The method of claim 1 , wherein the most apical electrode is associated with a pitch, and wherein the directing of the cochlear implant to apply one or more anode-cathode biphasic stimulation pulses to the most apical electrode is configured to result in a pitch being presented to the patient that is lower than the pitch associated with the most apical electrode.

3. The method of claim 1 , further comprising:

detecting, by the sound processor, an auditory scene associated with the patient;

wherein the directing of the cochlear implant to apply one or more anode-cathode biphasic stimulation pulses to the most apical electrode is performed in response to the detecting of the auditory scene.

4. The method of claim 3 , wherein the auditory scene comprises an auditory scene in which the patient is listening primarily to music.

5. The method of claim 1 , further comprising:

detecting, by the sound processor subsequent to the directing of the cochlear implant to apply one or more anode-cathode biphasic stimulation pulses to the most apical electrode, a change in an auditory scene associated with the patient; and

directing, by the sound processor, the cochlear implant to switch to applying one or more cathode-anode biphasic stimulation pulses to the most apical electrode in response to the detecting of the change in the auditory scene.

6. The method of claim 5 , wherein the change in the auditory scene comprises a change to an auditory scene in which the patient is listening primarily to speech.

7. The method of claim 1 , further comprising:

identifying, by the sound processor, a group of one or more additional electrodes included in the plurality of electrodes that is adjacent to the most apical electrode; and

directing, by the sound processor, the cochlear implant to apply one or more anode-cathode biphasic stimulation pulses to the group of one or more additional electrodes during the stimulation period.

8. The method of claim 1 , wherein the plurality of other electrodes included in the plurality of electrodes comprise all of the electrodes included in the plurality of electrodes other than the most apical electrode.

9. The method of claim 1 , wherein a duration of the negative second phase is longer than a duration of the positive first phase.

10. The method of claim 9 , wherein the duration of the negative second phase is at least twice as long as the duration of the positive first phase.

11. The method of claim 1 , further comprising performing the directing of the cochlear implant to apply one or more anode-cathode biphasic stimulation pulses to the most apical electrode in conjunction with a phantom electrode stimulation sound processing program.

12. A method comprising:

designating, by a sound processor, one or more electrodes included in a plurality of electrodes disposed within a cochlea of a patient as being included in a group of one or more apical electrodes and a remaining number of electrodes included in the plurality of electrodes as being included in a group of non-apical electrodes;

directing, by the sound processor, a cochlear implant communicatively coupled to the plurality of electrodes to apply one or more cathode-anode biphasic stimulation pulses to a plurality of electrodes included in the group of non-apical electrodes during a stimulation period, wherein the one or more cathode-anode biphasic stimulation pulses each comprise a negative first phase followed by a positive second phase; and

directing, by the sound processor, the cochlear implant to apply one or more anode-cathode biphasic stimulation pulses to one or more electrodes included in the group of one or more apical electrodes during the stimulation period, wherein the one or more anode-cathode biphasic stimulation pulses each comprise a positive first phase followed by a negative second phase;

wherein the one or more anode-cathode biphasic stimulation pulses and the one or more cathode-anode biphasic stimulation pulses are equivalent in pulse width.

13. The method of claim 12 , wherein the group of one or more apical electrodes comprises a most apical electrode included in the plurality of electrodes.

14. The method of claim 12 , further comprising:

detecting, by the sound processor, an auditory scene associated with the patient;

wherein the directing of the cochlear implant to apply one or more anode-cathode biphasic stimulation pulses to one or more electrodes included in the group of one or more apical electrodes is performed in response to the detecting of the auditory scene.

15. The method of claim 14 , wherein the auditory scene comprises an auditory scene in which the patient is listening to music.

16. The method of claim 12 , further comprising:

detecting, by the sound processor subsequent to the directing of the cochlear implant to apply the one or more anode-cathode biphasic stimulation pulses to one or more electrodes included in the group of one or more apical electrodes, a change in an auditory scene associated with the patient; and

directing, by the sound processor in response to the change in the auditory scene, the cochlear implant to switch to applying one or more cathode-anode biphasic stimulation pulses to the one or more electrodes included in the group of one or more apical electrodes.

17. The method of claim 16 , wherein the change in the auditory scene comprises a change to an auditory scene in which the patient is listening to speech.

18. The method of claim 12 , wherein a duration of the negative second phase is longer than a duration of the positive first phase.

19. A system comprising:

a detection facility configured to identify a most apical electrode included in a plurality of electrodes disposed within a cochlea of a patient; and

a control facility communicatively coupled to the detection facility and configured to

direct a cochlear implant communicatively coupled to the plurality of electrodes to apply one or more anode-cathode biphasic stimulation pulses to the most apical electrode during a stimulation period, wherein the one or more anode-cathode biphasic stimulation pulses each comprise a positive first phase followed by a negative second phase; and

direct the cochlear implant to apply one or more cathode-anode biphasic stimulation pulses to a plurality of other electrodes included in the plurality of electrodes during the stimulation period, wherein the one or more cathode-anode biphasic stimulation pulses each comprise a negative first phase followed by a positive second phase;

wherein the one or more anode-cathode biphasic stimulation pulses and the one or more cathode-anode biphasic stimulation pulses are equivalent in pulse width.

20. The system of claim 19 , wherein:

the detection facility is further configured to detect an auditory scene associated with the patient; and

the control facility is configured to perform the directing of the cochlear implant to apply one or more anode-cathode biphasic stimulation pulses to the most apical electrode in response to the detection of the auditory scene.