title: Loudness summation using focused and unfocused electrical stimulation.
abstract: With a cochlear implant, when stimulation from multiple channels is interleaved, the perceived loudness is greater than the loudness associated with any of the individual channels presented in isolation. This phenomenon is known as loudness summation. This study examined if loudness summation with monopolar and tripolar stimulation were equivalent at two loudnesses and two spacing configurations. Results suggest that loudness summation is similar for monopolar and tripolar modes. However, larger summation differences were observed for softer sounds and louder sounds with a larger spatial separation. The results are consistent with the idea that loudness summation is dependent on channel interaction and have implications for implementing current-focused processing strategies.
authors.affiliation: House Research Institute, 2100 West 3rd Street, Los Angeles, California 90057 Monica.PadillaVelez@nyumc.org, David.Landsberger@nyumc.org.
authors.forename: Monica
authors.initials: M
authors.lastname: Padilla
authors.affiliation: House Research Institute, 2100 West 3rd Street, Los Angeles, California 90057 Monica.PadillaVelez@nyumc.org, David.Landsberger@nyumc.org.
authors.forename: David M
authors.initials: DM
authors.lastname: Landsberger
mesh_terms: D000161:Acoustic Stimulation; D019929:Cochlear Implantation / Q000295:instrumentation*; D003054:Cochlear Implants; D004558:Electric Stimulation; D006801:Humans; D008144:Loudness Perception; D019986:Persons with Hearing Disabilities / Q000523:psychology / Q000534:rehabilitation*; D011474:Prosthesis Design; D012815:Signal Processing, Computer-Assisted