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Spatiotemporal organization of myoclonic twitching in sleeping human infants
Greta Sokoloff1,2,3, Meredith M Hickerson1, Rebecca Y Wen1
1Department of Psychological and Brain Sciences, The University of Iowa, Iowa City, IA, USA.
Insights
Infant muscle twitches during sleep offer insights into nervous system development. Twitching patterns change with age, becoming more structured and providing information on sensorimotor development.
Area of Science:
- Neuroscience
- Developmental Biology
- Human Physiology
Background:
- Skeletal muscle twitches are common during active sleep in perinatal mammals.
- Myoclonic twitches are hypothesized to reflect the functional status of the infant nervous system.
- Previous twitching assessments were primarily limited to infant rodents.
Purpose of the Study:
- To analyze the rate and patterning of myoclonic twitches in human infants.
- To investigate changes in twitching across the first seven postnatal months.
- To explore the relationship between twitching patterns and sensorimotor development.
Main Methods:
- Utilized videography to record and analyze twitching during daytime sleep in human infants.
- Employed behavioral measures to quantify twitching frequency and distribution.
- Examined twitching patterns across different body parts and age groups.
Main Results:
- Twitching predominantly occurred in bursts at intervals of 10 seconds or less.
- Twitching expression varied across the body and changed with age.
- Facial/head twitching decreased postnatally, while hand/foot twitching remained consistently high.
- Twitch patterning became more structured with age, showing strong coupling between left/right limb twitches.
Conclusions:
- Myoclonic twitches provide a valuable, non-invasive window into infant nervous system function.
- Twitch patterns offer insights into typical and atypical sensorimotor development trajectories.
- Age-related changes in twitching reflect the maturation of neural pathways and motor control.
Abstract:
During the perinatal period in mammals when active sleep predominates, skeletal muscles twitch throughout the body. We have hypothesized that myoclonic twitches provide unique insight into the functional status of the human infant's nervous system. However, assessments of the rate and patterning of twitching have largely been restricted to infant rodents. Thus, here we analyze twitching in human infants over the first seven postnatal months. Using videography and behavioral measures of twitching during bouts of daytime sleep, we find at all ages that twitching across the body occurs predominantly in bursts at intervals of 10 s or less. We also find that twitching is expressed differentially across the body and with age. For example, twitching of the face and head is most prevalent shortly after birth and decreases over the first several months. In addition, twitching of the hands and feet occurs at a consistently higher rate than does twitching elsewhere in the body. Finally, the patterning of twitching becomes more structured with age, with twitches of the left and right hands and feet exhibiting the strongest coupling. Altogether, these findings support the notion that twitches can provide a unique source of information about typical and atypical sensorimotor development.
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