The Motor Theory of Speech Perception RevisedAlvin M. Liberman and Ignatius G. MattinglyPresented ByNeal AudenaertAgenda Introductions Two Objections Experimental Evidence Some Issues DiscussionAgenda Introductions Two Objections Experimental Evidence Some Issues DiscussionIntendedGesturesThe Theory Objects of speech perception are intended phonetic gestures represented as invariant motor commandsAcousticSignalGestureRecognitionModuleCognitive ProcessesIntendedGesturesThe Theory Motor commands call for movements of the articulators linguistically significant configurations Innately specifiedAcousticSignalGestureRecognitionModuleCognitive ProcessesAgenda Introductions Two Objections Meaningless Ludicrous Experimental Evidence Some Issues DiscussionMeaningless How does a “black box” help How to map from acoustics to gestures one-to-one many-to-oneCoarticulation Signal influenced by many gestures Influence is systematic Specific to language Isolated sounds are unintelligible Motor theory Speech perception differs from sound perception motor event vs. surface acoustic signalLudicrous Biological explanation Little green man hypothesis Not biologically unique Directionality of sound Visual depth perceptionProximal vs. Distal Perception Proximal Signal Directionality: time disparity Vision: binocular disparity Speech: acoustic signal Distal Perception Directionality: direction Vision: distance of object Speech: intended gestureSpeech is Different Different classes and domains Local of distal event Out there Conceptual (upstream neural command) Competition between modes Auditory SpeechAgenda Introductions Two Objections Experimental Evidence Some Issues DiscussionExperimental Evidence Articulation: multiplicity, variety, equivilanceof cues Coarticulation Sound and percept Different sounds & contexts, same percept Same sound, different context, different perceptExperimental Evidence Distinct phonetic and auditory modes Convergent visual and auditory modes Characteristics required for perception Responses to cuesAgenda Introductions Two Objections Experimental Evidence Some Issues DiscussionSome Issues Aspects of the Theory Invariant gestures Perception-production link How direct is perception Motor theory and modularity One module or twoAgenda Introductions Two Objections Experimental Evidence Some Issues
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