Part of human brain stays 'youthful' into older age

Aug 08 2014, 13:15 IST
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SummaryAt least one part of the human brain may be able to process information the same way in older age.

At least one part of the human brain may be able to process information the same way in older age as it does in the prime of life, according to a new study.

The research conducted at the University of Adelaide compared the ability of 60 older and younger people to respond to visual and non-visual stimuli in order to measure their "spatial attention" skills.

Spatial attention is critical for many aspects of life, from driving, to walking, to picking up and using objects.

"Our studies have found that older and younger adults perform in a similar way on a range of visual and non-visual tasks that measure spatial attention," said Dr Joanna Brooks, who conducted the study as a Visiting Research Fellow with the University of Adelaide's School of Psychology and the School of Medicine.

"Both younger (aged 18-38 years) and older (55-95 years) adults had the same responses for spatial attention tasks involving touch, sight or sound.

"In one task, participants were asked to feel wooden objects whilst blindfolded and decide where the middle of the object was - participants' judgements were significantly biased towards the left-hand side of the true object centre. This bias is subtle but highly consistent," Brooks said.

"When we think of ageing, we think not just of the physical aspects but also the cognitive side of it, especially when it comes to issues such as reaction time, which is typically slower among older adults.

"However, our research suggests that certain types of cognitive systems in the right cerebral hemisphere – like spatial attention – are 'encapsulated' and may be protected from ageing," she said.

Brooks, who is now a Research Fellow in Healthy Ageing based at the Australian National University, presented her results at the International Cognitive Neuroscience Conference in Brisbane.

"Our results challenge current models of cognitive ageing because they show that the right side of the brain remains dominant for spatial processing throughout the entire adult lifespan," Brooks said.

"We now need to better understand how and why some areas of the brain seem to be more affected by ageing than others," said Brooks.

The research could also be helpful in better understanding how diseases such as Alzheimer's affect the brain.

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