老年人大脑的某部分仍保持年轻的状态

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 new research conducted at the University of Adelaide. A study compared the ability of 60 older and younger people to respond to visual and non-visual stimuli¹ in order to measure their "spatial² 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," says Dr Joanna Brooks³, who conducted the study as a Visiting Research Fellow with the University of Adelaide's School of Psychology⁴ 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 blindfolded⁵ and decide where the middle of the object was -- participants' judgements were significantly biased⁷ towards the left-hand side of the true object centre. This bias⁶ is subtle but highly consistent," Dr Brooks says.

 

"When we think of ageing, we think not just of the physical aspects but also the cognitive⁸ 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 cerebral⁹（脑的） hemisphere -- like spatial attention -- are 'encapsulated' and may be protected from ageing," she says.

 

Dr Brooks, who is now a Research Fellow in Healthy Ageing based at the Australian National University, recently presented her results at the 12th International Cognitive Neuroscience Conference in Brisbane. Her project is part of an international collaboration¹⁰ with scientists at the University of Edinburgh and Queen Margaret University in Scotland to better understand spatial attention in the human brain.

 

"Our results challenge current models of cognitive ageing because they show that the right side of the brain remains¹¹ dominant¹² for spatial processing throughout the entire adult lifespan," Dr Brooks says. "We now need to better understand how and why some areas of the brain seem to be more affected¹³ by ageing than others."

 

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

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