Multisensory training can promote or impede visual perceptual learning of speech stimuli: visual-tactile vs. visual-auditory training
Identifieur interne : 001D81 ( Pmc/Corpus ); précédent : 001D80; suivant : 001D82Multisensory training can promote or impede visual perceptual learning of speech stimuli: visual-tactile vs. visual-auditory training
Auteurs : Silvio P. Eberhardt ; Edward T. Auer Jr. ; Lynne E. BernsteinSource :
- Frontiers in Human Neuroscience [ 1662-5161 ] ; 2014.
Abstract
In a series of studies we have been investigating how multisensory training affects unisensory perceptual learning with speech stimuli. Previously, we reported that audiovisual (AV) training with speech stimuli can promote auditory-only (AO) perceptual learning in normal-hearing adults but can impede learning in congenitally deaf adults with late-acquired cochlear implants. Here, impeder and promoter effects were sought in normal-hearing adults who participated in lipreading training. In Experiment 1, visual-only (VO) training on paired associations between CVCVC nonsense word videos and nonsense pictures demonstrated that VO words could be learned to a high level of accuracy even by poor lipreaders. In Experiment 2, visual-auditory (VA) training in the same paradigm but with the addition of synchronous vocoded acoustic speech impeded VO learning of the stimuli in the paired-associates paradigm. In Experiment 3, the vocoded AO stimuli were shown to be less informative than the VO speech. Experiment 4 combined vibrotactile speech stimuli with the visual stimuli during training. Vibrotactile stimuli were shown to promote visual perceptual learning. In Experiment 5, no-training controls were used to show that training with visual speech carried over to consonant identification of untrained CVCVC stimuli but not to lipreading words in sentences. Across this and previous studies, multisensory training effects depended on the functional relationship between pathways engaged during training. Two principles are proposed to account for stimulus effects: (1)
Url:
DOI: 10.3389/fnhum.2014.00829
PubMed: 25400566
PubMed Central: 4215828
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