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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, Mar 2: Killing an Indian porcupine and inviting his TikTok followers to view it proved costly for a 25-year-old man from Kalaburagi. Forest department officials tracked him down and arrested him on Sunday morning.

Manjunath Biryalhissa, a resident of Jewargi taluk, was famous for his various TikTok videos and for lifting heavy stones in his village and neighbouring areas.

According to forest officials, on Friday, Manjunath and his friends caught a porcupine in Sindagi range, Vijayapura and stoned it to death. Later, they fried and cooked it. Manjunath then made an 18-second video, where he spoke about the porcupine hunt and slaughter, besides inviting his followers to like the video and join him in the feast.

The video was on TikTok and Facebook. Wildlife activists who found the video alerted forest department officials.

“Porcupine comes under schedule four of the Wildlife Protection Act, 1972. Keeping this video as evidence we were able to trace him through his Facebook account, where he had shared details of his hometown,” said forest officials.

Bewngaluru, Jun 23: Karnataka Chief Minister B S Yediyurappa on Tuesday said Covid-19 related fatalities in the state was far less compared to other major states, as he called on people and front line corona warriors infected by the virus not to lose courage.

The Chief Minister made the statement following the alleged suicide of a constable attached with the Karnataka State Reserve Police after he tested positive for Covid-19. "The total number of COVID related deaths in the state is very less compared to other major states.

There is no reason for any infected citizen or government employees to lose courage. The government is always with you," a tweet on the Chief Minister's official twitter handle said.

Of the total of 14,011 deaths reported so far, Maharashtra accounted for the highest with 6,283 fatalities, followed by Delhi with 2,233, Gujarat with 1,684 and Tamil Nadu with 794.

Acknowledging that police form the frontline of corona warriors and were working putting their lives at stake, he said a special Covid-19 testing center is being set up for them and all measures will be taken to provide the best treatment for those infected.

As of June 22 evening, cumulatively 9,399 Covid-19 positive cases have been confirmed in the state, which includes 142 deaths and 5,730 discharges.

The constable, aged about 50 years, was attached with the Karnataka State Reserve Police and was said to be depressed after getting tested positive for Covid-19, sources said.

Expressing condolence over his death, another tweet on the Chief Minister's handle said he has directed officials to to provide all necessary compensation and facilities to the family of the deceased at the earliest. Bengaluru has in the last few days has seen a spike in the number of police personnel getting infected by the virus. At least 74 of them have tested positive in the city and are undergoing treatment, while three have died so far, official sources said.