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Task-dependent modulation of the visual sensory thalamus assists visual-speech recognition
- Source :
- NeuroImage
- Publication Year :
- 2018
-
Abstract
- The cerebral cortex modulates early sensory processing via feed-back connections to sensory pathway nuclei. The functions of this top-down modulation for human behavior are poorly understood. Here, we show that top-down modulation of the visual sensory thalamus (the lateral geniculate body, LGN) is involved in visual-speech recognition. In two independent functional magnetic resonance imaging (fMRI) studies, LGN response increased when participants processed fast-varying features of articulatory movements required for visual-speech recognition, as compared to temporally more stable features required for face identification with the same stimulus material. The LGN response during the visual-speech task correlated positively with the visual-speech recognition scores across participants. In addition, the task-dependent modulation was present for speech movements and did not occur for control conditions involving non-speech biological movements. In face-to-face communication, visual speech recognition is used to enhance or even enable understanding what is said. Speech recognition is commonly explained in frameworks focusing on cerebral cortex areas. Our findings suggest that task-dependent modulation at subcortical sensory stages has an important role for communication: Together with similar findings in the auditory modality the findings imply that task-dependent modulation of the sensory thalami is a general mechanism to optimize speech recognition. info:eu-repo/semantics/acceptedVersion
- Subjects :
- 0301 basic medicine
Adult
Male
Visual sensory
genetic structures
Cognitive Neuroscience
Speech recognition
Lipreading
Thalamus
Nucli geniculat lateral
Sensory system
Stimulus (physiology)
Parla
03 medical and health sciences
Young Adult
0302 clinical medicine
Ressonància magnètica funcional
medicine
otorhinolaryngologic diseases
Speech
Humans
Functional MRI
Brain Mapping
medicine.diagnostic_test
Resonancia magnética funcional
Habla
Geniculate Bodies
Recognition, Psychology
Magnetic Resonance Imaging
Lateral geniculate nucleus
Lectura de labios
030104 developmental biology
medicine.anatomical_structure
Neurology
Lectura de llavis
Cerebral cortex
FOS: Biological sciences
Geniculate body
Quantitative Biology - Neurons and Cognition
Speech Perception
Visual Perception
Neurons and Cognition (q-bio.NC)
Female
Psychology
Functional magnetic resonance imaging
Núcleo geniculado lateral
030217 neurology & neurosurgery
Subjects
Details
- ISSN :
- 10538119
- Database :
- OpenAIRE
- Journal :
- NeuroImage
- Accession number :
- edsair.doi.dedup.....5b0dfebfbc91b51ea1ff6b90b5f31f81
- Full Text :
- https://doi.org/10.1016/j.neuroimage.2018.05.032