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Graded, multidimensional intra- and intergroup variations in primary progressive aphasia and post-stroke aphasia.
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In: Brain : a journal of neurology, vol 143, iss 10 (2020)
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| 2 |
More Than Smell-COVID-19 Is Associated With Severe Impairment of Smell, Taste, and Chemesthesis.
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In: Chemical senses, vol 45, iss 7 (2020)
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Quantal biomechanical effects in speech postures of the lips.
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In: Journal of neurophysiology, vol 124, iss 3 (2020)
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Abstract:
The unique biomechanical and functional constraints on human speech make it a promising area for research investigating modular control of movement. The present article illustrates how a modular control approach to speech can provide insights relevant to understanding both motor control and observed variation across languages. We specifically explore the robust typological finding that languages produce different degrees of labial constriction using distinct muscle groupings and concomitantly distinct lip postures. Research has suggested that these lip postures exploit biomechanical regions of nonlinearity between neural activation and movement, also known as quantal regions, to allow movement goals to be realized despite variable activation signals. We present two sets of computer simulations showing that these labial postures can be generated under the assumption of modular control and that the corresponding modules are biomechanically robust: first to variation in the activation levels of participating muscles, and second to interference from surrounding muscles. These results provide support for the hypothesis that biomechanical robustness is an important factor in selecting the muscle groupings used for speech movements and provide insight into the neurological control of speech movements and how biomechanical and functional constraints govern the emergence of speech motor modules. We anticipate that future experimental work guided by biomechanical simulation results will provide new insights into the neural organization of speech movements.NEW & NOTEWORTHY This article provides additional evidence that speech motor control is organized in a modular fashion and that biomechanics constrain the kinds of motor modules that may emerge. It also suggests that speech can be a fruitful domain for the study of modularity and that a better understanding of speech motor modules will be useful for speech research. Finally, it suggests that biomechanical modeling can serve as a useful complement to experimental work when studying modularity.
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Keyword:
Bioengineering; Biomechanical Phenomena; biomechanical simulation; Computer Simulation; Facial Muscles; Humans; Lip; Medical and Health Sciences; Motor Activity; motor control; Neurology & Neurosurgery; Phonetics; Posture; Psychology and Cognitive Sciences; quantal effects; Rehabilitation; Speech
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URL: https://escholarship.org/uc/item/3cc102ff
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| 4 |
C9orf72, age at onset, and ancestry help discriminate behavioral from language variants in FTLD cohorts.
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In: Neurology, vol 95, iss 24 (2020)
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| 5 |
Language disparity is not a significant barrier for time-sensitive care of acute ischemic stroke.
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In: BMC neurology, vol 20, iss 1 (2020)
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Factors that predict diagnostic stability in neurodegenerative dementia.
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In: Journal of neurology, vol 266, iss 8 (2019)
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| 7 |
Factors that predict diagnostic stability in neurodegenerative dementia.
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In: Journal of neurology, vol 266, iss 8 (2019)
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| 8 |
Anomalous morphology in left hemisphere motor and premotor cortex of children who stutter
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| 9 |
Anterior insular thickness predicts speech sound learning ability in bilinguals.
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In: NeuroImage, vol 165 (2018)
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| 10 |
New Directions in Treatments Targeting Stroke Recovery.
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In: Stroke, vol 49, iss 12 (2018)
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| 11 |
Human Sensorimotor Cortex Control of Directly Measured Vocal Tract Movements during Vowel Production.
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In: The Journal of neuroscience : the official journal of the Society for Neuroscience, vol 38, iss 12 (2018)
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| 12 |
Large-scale associations between the leukocyte transcriptome and BOLD responses to speech differ in autism early language outcome subtypes.
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In: Nature neuroscience, vol 21, iss 12 (2018)
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| 13 |
Large-scale associations between the leukocyte transcriptome and BOLD responses to speech differ in autism early language outcome subtypes.
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In: Nature neuroscience, vol 21, iss 12 (2018)
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| 14 |
Peak alpha frequency is a neural marker of cognitive function across the autism spectrum.
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In: The European journal of neuroscience, vol 47, iss 6 (2018)
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| 15 |
Observing conversational laughter in frontotemporal dementia.
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In: Journal of neurology, neurosurgery, and psychiatry, vol 88, iss 5 (2017)
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| 16 |
Observing conversational laughter in frontotemporal dementia.
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In: Journal of neurology, neurosurgery, and psychiatry, vol 88, iss 5 (2017)
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| 17 |
Language structure in the brain: A fixation-related fMRI study of syntactic surprisal in reading.
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| 18 |
Dynamic Structure of Neural Variability in the Cortical Representation of Speech Sounds.
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In: The Journal of neuroscience : the official journal of the Society for Neuroscience, vol 36, iss 28 (2016)
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| 19 |
Therapy and clinical trials in frontotemporal dementia: past, present, and future.
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In: Journal of neurochemistry, vol 138 Suppl 1, iss S1 (2016)
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