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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, May 3: Karnataka Government has allowed the movement of migrant workers, pilgrims, tourists, students and other persons who are stranded and also those who want to go to their residence as a "one-time measure" from district to district, after obtaining "one-day, one way" passes issued by concerned authorities.

Consequent to the Ministry of Home Affairs (MHA) new guidelines on lockdown measures, the government of Karnataka issued new guidelines on lockdown measures which will come into effect from May 4 for the period of two weeks.

In an order issued on Saturday, Chief Secretary and Chairman, State Executive Committee, Karnataka State Disaster Management Authority stated, "In the exercise of the powers, conferred under the Disaster Management Act, 2005, the undersigned, in his capacity of Chairman, State Executive Committee, hereby order to permit movement migrant workers, pilgrims, tourists, students and other persons who are stranded and also those people who want to go to their residence as a one-time measure from district to district with one-time one-day one-way passes issued by concerned Deputy Commissioners of the districts/Deputy Commissioner of Police in Commissionerates for strict implementation."

The details of the passes issued shall be shared by the issuing Deputy Commissioners of the districts/ Deputy Commissioner of Police with the receiving Deputy Commissioners of the districts/Deputy Commissioners of Police shall follow the SOPs prescribed by the Ministry of Health and Family Welfare for the movement of such persons, the order read.

It is reiterated that this would be a one-time one-day one-way pass for the individuals to reach their final destination.

Meanwhile, three deaths and 12 new COVID-19 cases were reported in the 24 hours in Karnataka, said the state Health Department on Saturday.

According to the Health Department, the total number of coronavirus positive cases in the State is now 601. 271 patients have either been cured or discharged. The virus has killed 25 people so far in the State.