Summary: Impaired perception experienced by older people goes hand in hand with a spatial enhancement of brain activity, a new study reports.
Learning at an advanced age makes the brain fit but age-related brain changes cannot be undone.
The researchers asked test participants in different age cohorts to feel two needlepoints that were located closely to each other with the tips of their fingers. Older participants perceived two points as a single event even when they were located quite far apart, whereas younger people were still able to distinguish them as two distinct points, which is evidence for degraded tactile perception at higher age. This impaired perception experienced by older people goes hand in hand with a spatial enhancement of brain activity, which researchers generally interpret as a compensatory mechanism.
Learning and training improve perception
“Age-related degraded perception is not irreversible; rather, it can be improved through training and learning,” explains Dr Hubert Dinse from the RUB Neural Plasticity Lab. The question researchers then asked was: if age-related impaired perception can be restored, will the age-related expansion of brain activity be reduced as well? In other words: can training and learning lead to a “rejuvenation” of the brain?
Learning too enhances brain activity
Studies with young adults have shown that learning processes are typically associated with an enhanced and broadened brain activity. If age-related impaired perception can be restored through learning, learning should have a different effect on the brain in older people than in young adults: the age-related enhanced brain activity should be reduced. Yet, as the neuroscientists from Bochum observed, the opposite is the case: learning processes in old people result in a further enhancement of brain activity too, which is associated with improved perception.
Learning to understand ageing and learning processes with the computer
“We asked ourselves: how can the different effects of enhanced brain activity on perception in older people be explained?” recounts Dr Burkhard Pleger from the RUB Neurology Clinic in Bergmannsheil Hospital. For the purpose of the study, the researchers used computer simulations to model both brain activity and associated perception. To this end, they simulated a number of alternatives of how those results might have been generated. These simulations showed that the observed pattern of age-related changes at the level of brain activity and perception could only be explained by the weakening of a mechanism that limits spread of activation, thus keeping activity focussed. In contrast, the observed learning effects could only be explained by reduced inhibition, which leads to higher brain activity. This mechanism is operating in both young and older people. Thus, the older brain learns according to the same principles as the younger brain. Considering the magnitude of learning-induced improved perceptual ability in younger and older participants, the study shows that older people improve even more than younger people. This result too can be explained by the computer simulations through reduced suppressive neural mechanisms in the elderly participants.
Training pays off at every age – but it does not rejuvenate the brain.
“The computer simulations explain how changed brain activity can have opposite effects on the level of perception. In addition, they explain the observation that the ‘treatment’ of ageing processes does not reverse age-related brain changes, but rather remodels them,” says Hubert Dinse. “They demonstrate that training and learning pay off at every age, in order to remain fit.”
Fuding: The project was funded by the Federal Ministry of Education and Research (Bernstein Fokus, Zustandsabhängigkeit des Lernens 01GQ0975; Projekt 18GL4DW4 und Projekt 01GQ0974, Bernstein Fokus Sequenzlernen 01GQ0963) and the German Research Foundation (TE 315/4-1, 334/19-1; SFB 874 TP A1 und A5).
Source: Hubert Dinse – RUB
Image Source: This NeuroscienceNews.com image is credited to Dinse et al./Scientific Reports.
Original Research: Full open access research for “A complementary role of intracortical inhibition in age-related tactile degradation and its remodelling in ” by Burkhard Pleger, Claudia Wilimzig, Volkmar Nicolas, Tobias Kalisch, Patrick Ragert, Martin Tegenthoff and Hubert R. Dinse in Scientific Reports. Published online June 15 2016 doi:10.1038/srep27388
[cbtabs][cbtab title=”MLA”]RUB. “How Older People Learn.” NeuroscienceNews. NeuroscienceNews, 16 June 2016.
<https://neurosciencenews.com/learning-aging-neuroscience-4492/>.[/cbtab][cbtab title=”APA”]RUB. (2016, June 16). How Older People Learn. NeuroscienceNews. Retrieved June 16, 2016 from https://neurosciencenews.com/learning-aging-neuroscience-4492/[/cbtab][cbtab title=”Chicago”]RUB. “How Older People Learn.” https://neurosciencenews.com/learning-aging-neuroscience-4492/ (accessed June 16, 2016).[/cbtab][/cbtabs]
A complementary role of intracortical inhibition in age-related tactile degradation and its remodelling in
Many attempts are currently underway to restore age-related degraded perception, however, the link between restored perception and remodeled brain function remains elusive. To understand remodeling of age-related cortical reorganization we combined functional magnetic resonance imaging (fMRI) with assessments of tactile acuity, perceptual learning, and computational modeling. We show that aging leads to tactile degradation parallel to enhanced activity in somatosensory cortex. Using a neural field model we reconciled the empirical age-effects by weakening of cortical lateral inhibition. Using perceptual learning, we were able to partially restore tactile acuity, which however was not accompanied by the expected attenuation of cortical activity, but by a further enhancement. The neural field model reproduced these learning effects solely through a weakening of the amplitude of inhibition. These findings suggest that the restoration of age-related degraded tactile acuity on the cortical level is not achieved by re-strengthening lateral inhibition but by further weakening intracortical inhibition.
“A complementary role of intracortical inhibition in age-related tactile degradation and its remodelling in ” by Burkhard Pleger, Claudia Wilimzig, Volkmar Nicolas, Tobias Kalisch, Patrick Ragert, Martin Tegenthoff and Hubert R. Dinse in Scientific Reports. Published online June 15 2016 doi:10.1038/srep27388