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Washington D.C., May 8: The prime time for brain development in a child's life is the first year, where the infant spends most of the time asleep. It is the time when neural connections form and sensory memories are encoded.

However, when sleep is disrupted, as occurs more often among children with autism, brain development may be affected, too.

New research led by the University of Washington finds that sleep problems in a baby's first 12 months may not only precede an autism diagnosis but also may be associated with altered growth trajectory in a key part of the brain, the hippocampus.

The study, which was published in the American Journal of Psychiatry, researchers report that in a sample of more than 400 taken of 6- to 12-month-old infants, those who were later diagnosed with autism were more likely to have had difficulty falling asleep.

It also states that this sleep difficulty was associated with altered growth trajectories in the hippocampus.

"The hippocampus is critical for learning and memory, and changes in the size of the hippocampus have been associated with poor sleep in adults and older children.

As many as 80 per cent of the children with autism spectrum disorder have sleep problems," said Annette Estes, director of the UW Autism Center and senior author of the study.

"In our clinical experience, parents have a lot of concerns about their children's sleep, and in our work on early autism intervention, we observed that sleep problems were holding children and families back," added Estes, who is also a UW professor of speech and hearing sciences.

"It could be that altered sleep is part-and-parcel of autism for some children. One clue is that behavioural interventions to improve sleep don't work for all children with autism, even when their parents are doing everything just right. This suggests that there may be a biological component to sleep problems for some children with autism," said Estes.

To consider links among sleep, brain development, and autism, researchers at the IBIS Network looked at MRI scans of 432 infants, surveyed parents about sleep patterns, and measured cognitive functioning using a standardized assessment.

At the outset of the study, infants were classified according to their risk for developing autism: Those who were at higher risk of developing autism -- about two-thirds of the study sample -- had an older sibling who had already been diagnosed.

Infant siblings of children with autism have a 20 per cent chance of developing autism spectrum disorder -- a much higher risk than children in the general population.

In the current study, 127 of the 432 infants were identified as "low risk" at the time the MRI scans were taken because they had no family history of autism.

They later evaluated all the participants at 24 months of age to determine whether they had developed autism. Of the roughly 300 children originally considered "high familial risk," 71 were diagnosed with autism spectrum disorder at that age.

Problems with sleep were more common among the infants later diagnosed with an autism spectrum disorder, as were larger hippocampi. No other subcortical brain structures were affected, including the amygdala, which is responsible for certain emotions and aspects of memory, or the thalamus, a signal transmitter from the spinal cord to the cerebral cortex.

The authors note that while parents reported more sleep difficulties among infants who developed autism compared to those who did not, the differences were very subtle and only observed when looking at group averages across hundreds of infants.

Sleep patterns in the first years of life change rapidly as infants transition from sleeping around the clock to a more adult-like sleep/wake cycle. Until further research is completed, Estes said, it is not possible to interpret challenges with sleep as an early sign of increased risk for autism.

Bengaluru, Jun 12: Karnataka on Friday reported 464 discharges, its highest, as the state confirmed 271 new cases of COVID-19 and seven related fatalities, taking the total number of infections to 6,516 and the death toll to 79.

In a significant development, the day also saw the total number of discharges overtaking the number of active cases in the state.

As of June 12 evening, cumulatively 6,516 COVID-19 positive cases have been confirmed in the state, which includes 79 deaths and 3,440 discharges, the Health department said in its bulletin.

It said, out of 2,995 active cases, 2,976 patients are in isolation at designated hospitals and are stable, while 19 are in ICU.

The seven deaths include four from Bengaluru, two from Kalaburagi and one from Hassan.

Those from Bengaluru are three women aged 61, 65 and 49 and a 52-year old man.

Among the dead from Kalaburagi are two men aged 53 and 48 while a 60-year old man from Hassan also succumbed to the virus.

Out of 271 new cases, 92 are returnees from other states, majority of them from neighbouring Maharashtra.

While 14 are those who returned from other countries.

Among the districts where the new cases were reported, Ballari accounted for 97 cases, followed by Bengaluru urban 36, Udupi 22, Kalaburagi 20, Dharwad 19, Dakshina Kannada 17, Bidar 10, nine each from Hassan and Mysuru, Tumakuru 7, Shivamogga 6, four each from Raichur and Uttara Kannada, three each from Chitradurga and Ramanagara, Mandya 2, and one each from Belagavi, Vijayapura and Kolar.

Udupi district tops the list of positive cases, with a total of 991 infections, followed by Kalaburagi (816) and Yadgir (735).

Among discharges also Udupi tops the list with a total of 474, followed by Kalaburagi (345) and Bengaluru urban (299).

A total of 4,26,341 samples have been tested so far, with 9,835 on Friday alone.

So far 4,11,244 samples have been reported as negative, and out of them 9,139 were reported negative today.