Could seeing themselves in a mirror help babies copy others?
A recent study examined whether exposure to one’s own reflection can influence the development of facial mimicry in 4-month-old infants
A study assessed whether exposure to their own reflection influences the development of facial mimicry, a process associated with empathy and emotion recognition, in 4-month-old infants. The results showed that infants exposed to their own reflection showed greater increases in sensorimotor cortex activity when observing others' facial expressions, but this did not translate into increased facial copying behaviour.
Mimicry, the spontaneous tendency to copy others’ actions, plays an important role in facilitating social bonds, increasing empathy between strangers and promoting helping behaviours. Facial mimicry can begin early in life and is particularly relevant because it may help us recognise others’ emotions.
Some authors argue that the link between “seeing” and “doing” is innate and that infants can imitate others’ actions from birth. However, other studies suggest that this link may instead be shaped by sensorimotor experience throughout development.
Based on this latter hypothesis, a recent study examined whether exposure to one’s own reflection can influence the development of facial mimicry in infants. With the support of the Bial Foundation, the research was led by Dr Carina de Klerk from the University of Essex (United Kingdom) and involved infants aged around four months.
Over two weeks, one group of infants had daily contact with a small mirror embedded in a toy, while another group used the same toy without access to the mirror. Before and after this period, the infants watched videos of other babies displaying facial expressions while researchers simultaneously recorded brain activity using electroencephalography (EEG) and facial muscle activity using electromyography (EMG), allowing neural and behavioural responses to be assessed.
The results are reported in the article Two Weeks of Mirror Exposure Enhances Sensorimotor Cortex Activation but not Facial Mimicry in 4-Month-old Infants, published in the journal Developmental Science. When observing other infants’ facial actions, the infants in the mirror group demonstrated greater activation over sensorimotor regions involved in linking perception and action at post-test. This effect was particularly evident over the right hemisphere, in an area associated with face representation, suggesting that observing one’s own movements may strengthen neural circuits involved in perceiving others’ actions. However, no increase in facial mimicry, as measured by EMG, was observed. Although the neural processing of others’ facial actions was enhanced by sensorimotor experience, longer exposure may be required for this to translate into increased facial mimicry.
This study suggests that simple, everyday experiences, such as seeing one’s own reflection, can shape the social brain from a very early age. As Carina de Klerk notes, these findings "suggest that the neural mechanisms underlying social perception can be shaped by sensorimotor experience early in infancy, and may emerge before these changes are reflected in behaviour."
Learn more about the project “134/20 - Copy me, copy you: Investigating the development of facial mimicry” here.
Journal
Developmental Science
Method of Research
Experimental study
Subject of Research
People
Article Title
Two Weeks of Mirror Exposure Enhances Sensorimotor Cortex Activation but not Facial Mimicry in 4-Month-old Infants
Movement of infants when sleeping provides insight into sleep cycles
University of Surrey
Infants’ activity whilst sleeping is rhythmic, according to a new study from the University of Surrey. Findings provide crucial insight into sleep cycles of infants in the first year of life.
In the largest study of its kind, scientists from Surrey, led by Dr Eva Winnebeck, investigated the sleep cycle development of 152 infants at age 3, 6 and 12 months.
To learn more, movement levels of infants were closely monitored using an actigraphy device (a non-invasive, wearable piece of technology placed on the ankle of infants) for 10 days at each age. Parents were also provided with an actigraphy device for their wrist to measure their movement whilst sleeping.
Dr Winnebeck, a Lecturer in Chronobiology at the University of Surrey, said:
“During the first year of life, sleep undergoes a remarkable development. From multiple short sleep bouts scattered almost evenly across the 24-hour day, an infant’s sleep gradually moves into the nighttime and consolidates into longer bouts, much to the relief of their parents.
“Infant sleep, despite its importance for neurological and physical development, is an under-researched area of science. To learn more, we have gone back to basics and are examining the movement of infants whilst they sleep. This was the foundation of sleep research prior to the discovery of REM and non-REM sleep and provides a useful window into infant sleep outside the sleep lab. The more we learn, the more we can pinpoint healthy from unhealthy sleep and help parents and doctors to catch problems early to support infants in their optimal development.”
Using signal processing techniques in combination with the analysis of more than 35,000 hours of sleep data from the infants, scientists identified the existence of rhythmic patterns of inactivity in infants from three months of age. Cycles of inactivity typically lasted 60 minutes and increased by 10 minutes until 12 months. Unsurprisingly, cycles were shorter in infants than their parents whose cycles of inactivity lasted 81 minutes on average. These findings are in line with smaller studies examining REM and non-REM sleep cycles and confirm that sleep cycles gradually lengthen over development
Limb inactivity was also found to be higher at the start of the sleep bout and did decrease as time progressed, again mirroring REM and non-REM dynamics.
Scientists also found that infants who were still breastfed at 12 months had longer cycles of inactivity compared to non-breastfed infants. Mothers who were still breastfeeding their infant at this age were also found to have a longer cycle length, by approximately 6.7 minutes.
Scientists hypothesise that breast feeding, due to its hormonal content (higher cortisol during daytime and higher melatonin at night) could potentially lead to circadian entrainment in infants and contribute to the maturation of the circadian system. However more research is needed in this area.
Dr Grégory Hammad, a Visiting Researcher at the University of Surrey and the first author of the study, said:
“It seems obvious that inactivity levels correlate with the onset of sleep as when infants are asleep, they are less likely to move. However, what we have found is that inactivity of limbs is in fact itself rhythmic during sleep and follows a pattern similar to the cyclic alternation of non-REM and REM sleep across the night. The cycles of inactivity increased in length with a child’s age and are a good indicator of what sleep cycle an infant is in. Our finding will help advance our understanding of the intricate relationship between sleep and development.”
This study was published in the journal: SLEEP
Journal
SLEEP
Article Title
‘Charting infant sleep cycle development using actigraphy: longitudinal evidence for ultradian cycle lengthening within the first year of life from 35,000 hours of sleep’
Article Publication Date
13-Jun-2026
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