Johan Laneau
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Johan Laneau has a total of 4 co-authors. Here are the top co-authors by number of shared publications:
Jan Wouters
3 shared publicationsMarc Moonen
2 shared publications- Astrid van Wieringen
KU Leuven
1 shared publication - Bart Boets
Center for Developmental Psychiatry, Department of Neurosciences, KU Leuven, 3000 Leuven, Belgium
1 shared publication
Latest Publications
- 1 March 2005
- Published by Elsevier in Journal of Neuroscience Methods
- Vol. 142 (1) , 131-136
A flexible auditory research platform using acoustic or electric stimuli for adults and young children
- 1 March 2005
- Published by Elsevier in Journal of Neuroscience Methods
- Vol. 142 (1) , 131-136
A flexible auditory research platform using acoustic or electric stimuli for adults and young children
- 1 December 2004
- Published by Acoustical Society of America (ASA) in The Journal of the Acoustical Society of America
- Vol. 116 (6) , 3606-3619
Relative contributions of temporal and place pitch cues to fundamental frequency discrimination in cochlear implantees
The effect of the filter bank on fundamental frequency discrimination was examined in four Nucleus CI24 cochlear implant subjects for synthetic stylized vowel-like stimuli. The four tested filter banks differed in cutoff frequencies, amount of overlap between filters, and shape of the filters. To assess the effects of temporal pitch cues on discrimination, temporal fluctuations were removed above 10 Hz in one condition and above 200 Hz in another. Results indicate that discrimination based upon place pitch cues is possible, but just-noticeable differences exceed 1 octave or more depending on the filter bank used. Increasing the frequency resolution in the range improves the discrimination based upon place pitch cues. The results of discrimination based upon place pitch agree with a model that compares the centroids of the electrical excitation pattern. The addition of temporal fluctuations up to 200 Hz significantly improves discrimination. Just-noticeable differences using both place and temporal pitch cues range from 6% to 60%. Filter banks that do not resolve the higher harmonics provided the best temporal pitch cues, because temporal pitch cues are clearest when the fluctuation on all channels is at and preferably in phase.- 1 December 2004
- Published by Acoustical Society of America (ASA) in The Journal of the Acoustical Society of America
- Vol. 116 (6) , 3606-3619
Relative contributions of temporal and place pitch cues to fundamental frequency discrimination in cochlear implantees
The effect of the filter bank on fundamental frequency discrimination was examined in four Nucleus CI24 cochlear implant subjects for synthetic stylized vowel-like stimuli. The four tested filter banks differed in cutoff frequencies, amount of overlap between filters, and shape of the filters. To assess the effects of temporal pitch cues on discrimination, temporal fluctuations were removed above 10 Hz in one condition and above 200 Hz in another. Results indicate that discrimination based upon place pitch cues is possible, but just-noticeable differences exceed 1 octave or more depending on the filter bank used. Increasing the frequency resolution in the range improves the discrimination based upon place pitch cues. The results of discrimination based upon place pitch agree with a model that compares the centroids of the electrical excitation pattern. The addition of temporal fluctuations up to 200 Hz significantly improves discrimination. Just-noticeable differences using both place and temporal pitch cues range from 6% to 60%. Filter banks that do not resolve the higher harmonics provided the best temporal pitch cues, because temporal pitch cues are clearest when the fluctuation on all channels is at and preferably in phase.- 27 May 2004
- Published by Springer Nature in Journal of the Association for Research in Otolaryngology
- Vol. 5 (3) , 285-294
Multichannel Place Pitch Sensitivity in Cochlear Implant Recipients
Cochlear implant recipients perceive a rise in pitch when the site of stimulation is moved from the apex toward the base. The place pitch sensitivity is typically measured using the stimulation of single channels. However, all current cochlear implant devices stimulate multiple channels simultaneously or with pulses temporally interleaved. The primary goal of the present study is to test whether the sensitivity of a cochlear implant recipient to changes in perceived pitch associated with changes of place of excitation improves or deteriorates when the number of active channels is increased, compared with stimulation with only one active channel. Place pitch sensitivity was recorded in four Nucleus CI24 subjects as a function of number of active channels (from 1 to 8). Just noticeable differences were estimated from a constant stimuli 2AFC pitch-ranking experiment with roving loudness. Reference and comparison stimuli contained the same number of active channels but were shifted one or two electrodes toward the base or toward the apex. The place pitch sensitivity was measured using monopolar stimulation at two locations along the electrode array. To minimize cues related to loudness, the multichannel stimuli were loudness balanced relative to the single-channel stimuli presented at C-level. The number of active channels did not affect place pitch sensitivity. This is consistent with a model that compares the edges of the excitation pattern irrespective of the overlap between excitation patterns. There was a significant difference in sensitivity to place pitch among subjects. The average just noticeable differences of place pitch, extrapolated from a fitting procedure, for the subjects ranged from 0.25 mm to 0.46 mm.
- 27 May 2004
- Published by Springer Nature in Journal of the Association for Research in Otolaryngology
- Vol. 5 (3) , 285-294
Multichannel Place Pitch Sensitivity in Cochlear Implant Recipients
Cochlear implant recipients perceive a rise in pitch when the site of stimulation is moved from the apex toward the base. The place pitch sensitivity is typically measured using the stimulation of single channels. However, all current cochlear implant devices stimulate multiple channels simultaneously or with pulses temporally interleaved. The primary goal of the present study is to test whether the sensitivity of a cochlear implant recipient to changes in perceived pitch associated with changes of place of excitation improves or deteriorates when the number of active channels is increased, compared with stimulation with only one active channel. Place pitch sensitivity was recorded in four Nucleus CI24 subjects as a function of number of active channels (from 1 to 8). Just noticeable differences were estimated from a constant stimuli 2AFC pitch-ranking experiment with roving loudness. Reference and comparison stimuli contained the same number of active channels but were shifted one or two electrodes toward the base or toward the apex. The place pitch sensitivity was measured using monopolar stimulation at two locations along the electrode array. To minimize cues related to loudness, the multichannel stimuli were loudness balanced relative to the single-channel stimuli presented at C-level. The number of active channels did not affect place pitch sensitivity. This is consistent with a model that compares the edges of the excitation pattern irrespective of the overlap between excitation patterns. There was a significant difference in sensitivity to place pitch among subjects. The average just noticeable differences of place pitch, extrapolated from a fitting procedure, for the subjects ranged from 0.25 mm to 0.46 mm.