Document Detail


The elicitation of audiovisual steady-state responses: multi-sensory signal congruity and phase effects.
MedLine Citation:
PMID:  21380858     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Most ecologically natural sensory inputs are not limited to a single modality. While it is possible to use real ecological materials as experimental stimuli to investigate the neural basis of multi-sensory experience, parametric control of such tokens is limited. By using artificial bimodal stimuli composed of approximations to ecological signals, we aim to observe the interactions between putatively relevant stimulus attributes. Here we use MEG as an electrophysiological tool and employ as a measure the steady-state response (SSR), an experimental paradigm typically applied to unimodal signals. In this experiment we quantify the responses to a bimodal audio-visual signal with different degrees of temporal (phase) congruity, focusing on stimulus properties critical to audiovisual speech. An amplitude modulated auditory signal ('pseudo-speech') is paired with a radius-modulated ellipse ('pseudo-mouth'), with the envelope of low-frequency modulations occurring in phase or at offset phase values across modalities. We observe (i) that it is possible to elicit an SSR to bimodal signals; (ii) that bimodal signals exhibit greater response power than unimodal signals; and (iii) that the SSR power at specific harmonics and sensors differentially reflects the congruity between signal components. Importantly, we argue that effects found at the modulation frequency and second harmonic reflect differential aspects of neural coding of multisensory signals. The experimental paradigm facilitates a quantitative characterization of properties of multi-sensory speech and other bimodal computations.
Authors:
Julian Jenkins; Ariane E Rhone; William J Idsardi; Jonathan Z Simon; David Poeppel
Related Documents :
24519168 - Fibrin plugging as a cause of microcirculatory occlusion during photodynamic therapy.
21738988 - The use of high frequency waves to treat onychomycosis: preliminary communication of th...
23358248 - Out of the lab and into the bathroom: evening short-term exposure to conventional light...
24437758 - Human response to vibration in residential environments.
7853088 - Chromatic-discrimination axes, crt phosphor spectra, and individual variation in color ...
9318418 - Spatial orientation in the lamprey. ii. visual influence on orientation during locomoti...
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2011-03-06
Journal Detail:
Title:  Brain topography     Volume:  24     ISSN:  1573-6792     ISO Abbreviation:  Brain Topogr     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-05-06     Completed Date:  2012-03-26     Revised Date:  2013-01-14    
Medline Journal Info:
Nlm Unique ID:  8903034     Medline TA:  Brain Topogr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  134-48     Citation Subset:  IM    
Affiliation:
Department of Biology, University of Maryland, College Park, 20742, USA. julianj@umd.edu
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Acoustic Stimulation / methods
Adolescent
Adult
Auditory Perception / physiology*
Brain Mapping / methods
Evoked Potentials, Auditory / physiology*
Evoked Potentials, Visual / physiology*
Female
Humans
Magnetoencephalography / methods*
Male
Photic Stimulation / methods
Speech Perception / physiology*
Visual Perception / physiology*
Young Adult
Grant Support
ID/Acronym/Agency:
2R01DC05660/DC/NIDCD NIH HHS; DC-00046/DC/NIDCD NIH HHS; R01 DC005660/DC/NIDCD NIH HHS; R01 DC005660-08/DC/NIDCD NIH HHS; R01 DC005660-09/DC/NIDCD NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Valsartan, an Angiotensin II Receptor Blocker, Attenuates Cardiac Dysfunction and Oxidative Stress i...
Next Document:  Synthesis and Use of Pseudopeptides Derived from 1,2,4-Oxadiazole-, 1,3,4-Oxadiazole-, and 1,2,4-Tri...