Influence of limitations from the auditory periphery on across-channel sensitivity to amplitude modulation rate in cochlear-implant users

2017 ◽  
Vol 141 (5) ◽  
pp. 3815-3815
Author(s):  
Sean R. Anderson ◽  
Alan Kan ◽  
Ruth Litovsky
Keyword(s):  
Cochlear Implant ◽  
Amplitude Modulation ◽  
Auditory Periphery ◽  
Modulation Rate ◽  
Amplitude Modulation Rate

Steady-State EEG and Psychophysical Measures of Multisensory Integration to Cross-Modally Synchronous and Asynchronous Acoustic and Vibrotactile Amplitude Modulation Rate

2018 ◽  
Vol 31 (5) ◽  
pp. 391-418 ◽  
Author(s):  
Justin R. Timora ◽  
Timothy W. Budd
Keyword(s):  
Steady State ◽  
Multisensory Integration ◽  
Amplitude Modulation ◽  
Sensory Modality ◽  
Stimulus Onset ◽  
Complex Pattern ◽  
Auditory Modality ◽  
Rate Dependent ◽  
Modulation Rate ◽  
Amplitude Modulation Rate

According to thetemporal principleof multisensory integration, cross-modal synchronisation of stimulus onset facilitates multisensory integration. This is typically observed as a greater response to multisensory stimulation relative to the sum of the constituent unisensory responses (i.e.,superadditivity). The aim of the present study was to examine whether the temporal principle extends to the cross-modal synchrony of amplitude-modulation (AM) rate. It is well established that psychophysical sensitivity to AM stimulation is strongly influenced by AM rate where the optimum rate differs according to sensory modality. This rate-dependent sensitivity is also apparent from EEG steady-state response (SSR) activity, which becomes entrained to the stimulation rate and is thought to reflect neural processing of the temporal characteristics of AM stimulation. In this study we investigated whether cross-modal congruence of AM rate reveals both psychophysical and EEG evidence of enhanced multisensory integration. To achieve this, EEG SSR and psychophysical sensitivity to simultaneous acoustic and/or vibrotactile AM stimuli were measured at cross-modally congruent and incongruent AM rates. While the results provided no evidence of superadditive multisensory SSR activity or psychophysical sensitivity, the complex pattern of results did reveal a consistent correspondence between SSR activity and psychophysical sensitivity to AM stimulation. This indicates that entrained EEG activity may provide a direct measure of cortical activity underlying multisensory integration. Consistent with the temporal principle of multisensory integration, increased vibrotactile SSR responses and psychophysical sensitivity were found for cross-modally congruent relative to incongruent AM rate. However, no corresponding increase in auditory SSR or psychophysical sensitivity was observed for cross-modally congruent AM rates. This complex pattern of results can be understood in terms of the likely influence of theprinciple of inverse effectivenesswhere the temporal principle of multisensory integration was only evident in the context of reduced perceptual sensitivity for the vibrotactile but not the auditory modality.

scholarly journals Interactive Coding of Visual Spatial Frequency and Auditory Amplitude-Modulation Rate

2012 ◽  
Vol 22 (5) ◽  
pp. 383-388 ◽  
Author(s):  
Emmanuel Guzman-Martinez ◽  
Laura Ortega ◽  
Marcia Grabowecky ◽  
Julia Mossbridge ◽  
Satoru Suzuki
Keyword(s):  
Spatial Frequency ◽  
Amplitude Modulation ◽  
Visual Spatial ◽  
Modulation Rate ◽  
Amplitude Modulation Rate ◽  
Interactive Coding

scholarly journals Interactive Processing of Auditory Amplitude-Modulation Rate and Visual Spatial Frequency

i-Perception ◽  
10.1068/ic913 ◽  
2011 ◽  
Vol 2 (8) ◽  
pp. 913-913
Author(s):  
Marcia Grabowecky ◽  
Emmanuel Guzman-Martinez ◽  
Laura Ortega ◽  
Julia Mossbridge
Keyword(s):  
Spatial Frequency ◽  
Amplitude Modulation ◽  
Visual Spatial ◽  
Modulation Rate ◽  
Amplitude Modulation Rate

Nonlinear stage of the modulational instability of a whistler wave. Part 1

1987 ◽  
Vol 38 (1) ◽  
pp. 155-167 ◽  
Author(s):  
V. I. Karpman ◽  
A. G. Shagalov
Keyword(s):  
Linear Theory ◽  
Amplitude Modulation ◽  
Wave Amplitude ◽  
Modulational Instability ◽  
Whistler Wave ◽  
Wave Part ◽  
Nonlinear Stage ◽  
Modulation Rate ◽  
Amplitude Modulation Rate

The development of the modulational instability of a whistler wave is investigated in the linear and subsequent nonlinear stages. It is shown that some predictions of the linear theory remain valid up to the tirne when the wave amplitude modulation rate is of the order of unity.

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