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Mangaluru, May 29: The southwest monsoon is expected to reach the Karnataka coast on June 1 or 2, earlier than forecast by the India Meteorological Department (IMD).

Normally, Karnataka witnesses the onset of monsoon either five or six days after it had entered Kerala. However, this time, Karnataka will also witness the arrival of monsoon either on June 1 or June 2, according to meteorologists at the Karnataka State Natural Disaster Monitoring Cell (KSNDMC).

The gradual formation of two low-pressure areas over the Arabian Sea located close to the western peninsular coast and gaining momentum has helped Karnataka mark the start of the four-month-long rainy season expected to revive the back-to-back drought-stricken state.

Confirming the changes in the atmospheric pattern, Dr GS Srinivasa Reddy, Director KSNDMC said, “Karnataka will also witness the onset of monsoon on the same time that of Kerala.”

The early onset of monsoon over Karnataka coast is attributed to prevailing to weather pattern over the Arabian Sea. 

“The two low-pressure areas over the Arabian Sea are steadily gaining momentum. They may reach the peak by the weekend and may concentrate further into depression causing widespread rainfall in the peninsular region and thereby advancing the onset of monsoon over the region,” Dr Reddy explained.

The KSNDMC, based on the Indian Meteorological Department (IMD) forecast, stated that due to 'prevailing favourable conditions over the Indian Ocean and Pacific Ocean regions', the monsoon will be normal and above normal over coastal and south-interior Karnataka according to the present scenario.

The IMD, which had initially issued a forecast of five-day delay in the onset, had issued a fresh forecast on Wednesday cautioning the states along the West coast about the formation of two intense low-pressure areas in South-East and East-Central Arabian Sea region.

Following the forecast, a yellow alert has also been issued in Kerala and coastal areas suggesting significant rainfall starting from this weekend. “Fishermen have also been advised not to venture into deep-sea due to high turbulent conditions,” an IMD official revealed.

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.