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Bengaluru, Jun 5: The much awaited Southwest Monsoon entered Karnataka with widespread rain in coastal and central regions of the southern state, an official said on Friday. Rain and thundershowers are likely to occur at most places over coastal areas and at a few places over the interior parts over the next 24-48 hours.

"The southwest monsoon entered the state on Thursday as predicted from Kerala and the Arabian Sea, with moderate to heavy rainfall in the coastal districts and central or Malnad region of the state," Karnataka State Natural Disaster Monitoring Centre Director Srinivas Reddy told media here.

Though the monsoon has set in on time in the state, Reddy said its progress was likely to be slow in the next three days, as cyclone Nisarga induced high-speed winds took away rain-bearing clouds from the southern peninsula.

According to the regional meteorological office, Karwar in Uttar Kannada district received a whopping 15cm rainfall on Thursday, followed by 11cm each at Kundapur in Udupi district and Shivamogga in Malnad region.

Kadra and Gersoppa in Uttara Kannada and Kottigehara in Chikkamagaluru district had 10cm rainfall, followed by 8cm at Virajpet in Kodagu district and 7cm each at Shirali and Gokarana in Uttara Kannda.

Isolated to scattered rainfall also occurred in many places across the north and south interior regions of the state.

"The monsoon will advance in the state to south and north interior areas after June 8 as there is lull in its movement due to lack of rain-bearing clouds and winds to carry them," said Reddy.

Noting that the four-month monsoon from June to September, crucial to the rain-dependent state would be normal this year, Reddy said its progress and spread, however, would depend on various factors like cloud formations and wind movements.

"Conditions are likely to become favourable for monsoon advancement in the state over the next 2-3 days," asserted Reddy.

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.