The Ageing Brain: Neuroplasticity and Lifelong Learning

In-depth
The Ageing Brain: Neuroplasticity and Lifelong
Learning
Author The role of adult education is becoming increasingly important in the framework of
policies to promote lifelong learning. Adult participation in training activities, however,
Eleonora Guglielman, PhD,
is still rather low, despite the incentives and initiatives aimed at allowing all citizens ac-
University Roma Tre, Italy
guglielman@tiscali.it cess to education and training at all ages in their lives.

Participation tends to decrease concomitantly with increasing age: the major difficulty
Tags that elderly people have in learning is due to a deterioration of brain function, causing
a progressive weakening of concentration, memory and mental flexibility. Today, ad-
neuroplasticity, lifelong vanced researches in neuroscience show that brain ageing may be reversible: the brain
learning, adult education, is plastic in all stages of life, and its maps can restructure themselves through learning
ageing, neuroscience
experiences.

1. Learning in mature age
In Europe the percentage of elderly people compared to the average age of the population
is costantly increasing: withing the next 30 years, the under 24 population will decrease of
15%; according to World Health Organization’s data, 2 billion people will be aged 60 and
older by 2050. Therefore, it is necessary to foster the participation of adult people in lifelong
learning activities to contribute reaching Lisbon goals. The Communication Adult learning:
It is never too late to learn focuses on the meaning of improving access and quality in adult
education for personal development and social inclusion, listing a series of vantages arising
from system strategic actions: increased employment opportunities, increased competition,
lower costs for social charges and for early retirement; among the effects on individual well-
being: self-fulfillment, active ageing, a better health. Adult education has a crucial impor-
tance within the active ageing policy and should be recognized terms of vision, priorities and
resources (Commission of the European Communities, 2006).

World Health Organization has pointed out how low school levels are correlated to an aug-
mented risk of disability and death in elderly people. Lifelong learning can support these
people in acquiring new skills, and developing the awarness and the sense of security need-
ed to live in an autonomous and independent way; in other words, learning contributes to
keep the elderly persons active and flexible (WHO, 2002).

However, there is an obstacle to learning in mature age: the mental decline related to the
deterioration of brain function, which is determined in the later stage of life. When the age
increases, the ability to generate new synapses between neurons in response to external
stimuli declines; this ability is the basis of fundamental and complex functions like memory
and learning. The brain ageing causes various changes: reduction in brain volume and gray
matter in particular, progressive atrophy of neurons and their interconnections, degenera-
tion of cortical regions governing the functions of sensation, cognition, memory and motor

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control, metabolic decline of key neurons and loss of features For decades the dominant model was represented by localiza-
related to physical and chemical deterioration (OECD, 2007). tion theory, according to which the cerebral cortex is composed
of distinct regions, each one aimed at specific functions: lan-
The acquiring of new knowledge and skills becomes therefore
guage, vision, hearing, etc. The precursor of this idea was the
more and more difficult, and the execution of complex tasks
German neuroanatomist Franz Joseph Gall (1758-1828), who
requires more effort than the younger learners. This problem
suggested that the cerebral cortex was divided into zones cor-
has been addressed both under the neurological and the educa-
responding to the 27 “faculties” recognized by the psychology
tional side by the OECD, which in 2001 held in Tokyo the Forum
of the time. The list of “faculties” was quite heterogeneous and
for Learning Science and Brain Research project to discuss is-
included, beside the memory, hope, faith, love, romantic love
sues related to the nature of brain ageing and cognitive func-
and similar concepts.
tion in old age. Data gathered by OECD demonstrate that many
cognitive abilities decline between the ages of 20 and 80; this Despite this theory appears rather naive today, it caused a great
reduction has effect especially on tasks like reading, recognizing sensation at that time. The debate came to a turning point with
letters and words, and generically on memory. The decay begins the studies of Broca and Wernicke, two scientists who examined
around age 30 and accelerates after age 50; it is characterized the brain damage suffered by individuals affected by aphasia,
by memory lapses, delays in reasoning, communication difficul- and who were the first to postulate the different specializations
ties, Freudian slips (OECD, 2002). of the two cerebral hemispheres. Their studies led to the cur-
rent model, which assigns different functions to different brain
Today the researches in neuroscience show that it is possible to
areas: the frontal lobes are the neuronal centers that govern the
prevent the deterioration of intellectual faculties, and to main-
activities of judgment and planning, development of concepts,
tain the functionality of the brain to learn in an effective and
organization and control of movements; parietal lobes are the
satisfactory way even in old age; in short, learning can actually
centers of primary somatic and sensory information processing,
be lifelong. The key word is neuroplasticity.
ie those from skin, muscles, joints and internal organs; the tem-
poral lobes collect and process auditory information; the occipi-
2. The static model of localization theory tal lobes process primaries visual information.
When we talk about neuroplasticity we refer to the change oc- Broca’s and Wernicke’s studies have allowed to confirm and
curring in the brain as the consequence of an experience, in- further develop the localization hypothesis of Gall and, through
volving the transfer of specific functions to cerebral areas other the subsequent experiments, to identify the key functions in the
than those originally allocated to them. To better explain the two cerebral hemispheres. According to this model, the right
meaning of this term, we have to step back and explain what hemisphere of the brain is responsible for processing informa-
was the commonly accepted conception of the brain until a few tion in a comprehensive and perceptive-spatial way, while the
decades ago. left hemisphere presides logical-mathematical abilities and
In the past, scientists believed that the different areas of the hu- symbolic thinking, besides containing the centers of produc-
man brain were predefined and unchangeable and that the pro- tion and comprehension of language. In the following years the
duction of neurons ceased after the age of development, with representation of the brain has been enriched on the basis of
the exception of structures dedicated to the memory, that con- observations showing that the lesions affecting certain parts of
tinue to produce neurons throughout adulthood. The brain was the brain cause the loss of specific functions; these studies have
considered an organ that, once reached its full development, made it possible to reconstruct a map of the cerebral cortex.
became static and incapable of further growth and was there- The localitation theory extends to hypothesize a neuropsy-
fore condemned to a slow and inexorable decline. The notion of chological model in which each region of the brain regulates a
plasticity was limited to the so-called critical period, that is the particular function independently and without interacting with
period corresponding to childhood pre-puberty, when the brain other regions, and that assumes that the structure of the brain
is particularly inclined to learn new skills with minimal effort, is fixed and immutable: a model that compares the brain to a
for example, learning a second language in addition to mother machine, in which each component performs a genetically pre-
tongue. determined function. One consequence of this theory is that if

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one of these components is damaged, it can’t be replaced. The same period in which scientists Michael Merzenich and Jon Kaas
obsolescence of the brain is therefore considered an irrevers- demonstrated by experiment that if a cortical map is no longer
ible process. receiving stimuli, it will be used for other functions, functions
generally located in areas adjacent to it, giving rise to phenome-
3. Anatomy of a plastic brain na of reorganization of the cerebral cortex (Mahncke, Bronstone
& Merzenich, 2006).
In the second half of the 20th century began to spread, support-
ed by experimental data, the idea that the brain is sufficiently
plastic to be able to reorganize in case of need even in adult-
4. “Learn a trade for every day”
hood, and that sensory signals can be processed in areas other Neuroplasticity is linked to the concept of competitiveness: if
than the ones destined to them. For example, people who have we stop exercising our mental faculties we not only forget them,
suffered damage affecting the language centers of the left hemi- but the corresponding map is automatically assigned to other
sphere have a chance to regain the ability to speak normally, functions that we continue to play. We could change the prov-
thanks to the restructuring of brain areas; tactile signals, in turn, erb “learn a trade for a rainy day” in: learn a trade for every day,
can be processed in the visual cortex and converted in images, and continue to practice it regularly.
as shown by some experiments (Doidge, 2007).
Competitiveness explains why it is so difficult to “unlearn” some-
It is commonly believed that the brain loses about 100,000 thing: if we have learned a behavior that has become dominant
neurons every day and that this loss is irreversible; actually, the occupying an extended map, it offers resistance to attempts to
neurons of large size decrease, while small ones are increasing substitute it with a different behavior, and it prevents that the
in number. This causes a reduction of plasticity, but does not same map is occupied by other functions. It also explains the
mean that the cognitive functions are reduced. The concept of difficulty in quitting bad habits, and the importance of learning
neuroplasticity is essential as an approach to therapeutic re- a behavior in childhood, when brain maps are on the road to be
habilitation programs in the event of trauma and brain dam- structured.
age. The human brain is not “wired” with fixed and immutable
According to Merzenich, brain structure and cognitive skills can
neuronal circuits; the synaptic brain network and the related
be improved through an appropriate exercise. The brain maps
structures, including the cerebral cortex, actively reorganize
are transformed according to what we do in our lifetime; most
themselves through experience and practice. Neuroplasticity
importantly, they are able to change at any age, even in adult-
is related to neurogenesis: neurons damaged can be replaced
hood.
by stem cells (non-specialized cells able to transform into any
cell type). The neuronal stem cells reproduce giving rise to exact Starting from the idea that learning corresponds to create new
copies of themselves, continuously and without showing signs connections between neurons through their simultaneous and
of ageing; the neurogenesis process continues uninterruptedly repeated activation, Merzenich has developed a theory that the
throughout life, until the death of the individual. It is therefore neuronal structure can be changed by the experience, which
evident that the discovery of neural stem cells was critical to means that even people who have congenital problems or le-
demonstrate that the brain never stops producing new neurons, sions in certain brain areas can develop new neural connections.
even in old age; currently scientists are studying the possibility On the basis of these beliefs, Merzenich proposes a set of ex-
of replacing the damaged brain tissue of adults to recover the ercises targeted at people with language disabilities and learn-
functions in the case of degenerative diseases and brain inju- ing deseases; the exercises are progressive and are followed by
ries. a positive feedback whenever the user reach the objectve, in
order to keep constant attention and consolidate the achieved
On the concept of plasticity Gerald Edelman has developed
result. The feedback, in fact, causes the release of dopamine
neural darwinism (or theory of neuronal group selection). It is
and acetylcholine, two neurotransmitters that contribute to the
an evolutionary model according to which the brain maps are
reinforcement of the memory; the result is a reshaping of the
not completely predetermined at the genetic level but also de-
brain maps.
pend on the individual experience and the interaction with the
environment. Neuronal Darwinism has been developed in the

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These exercises have caused significant progress in students’ to the brain are more confused and difficult to interpret. There-
learning, also with autistic children and elderly people, improv- fore the brain must slow its activities to decipher confused sig-
ing their mental abilities. The basic idea is that it is possible to nals, so mental representations are incomplete. This causes a
reopen the “critical period” of the brain plasticity so that even poorer memory and less elastic thinking skills.
in adulthood brain maps can be “rewired”; this allows, for ex-
Weakening of neuromodulatory function. In elderly age the
ample, to learn a foreign language in adulthood as easily as in
brain produces fewer neurotransmitters, chemicals like dopa-
the case of prepubertal children, who learn a language easely
mine and acetylcholine, which play an essential role in learning
and without accent. Merzenich’s system is based on different
and memory.
mental exercises specifically designed and calibrated to improve
memory, reasoning and processing speed in older people. Negative learning. People who begin to feel less mentally agile
than once tend to implement mechanisms for compensation. If,
The assumption is that the mental deterioration in elderly peo-
for example, their hearing is impaired, they turn off the TV, or
ple is linked to the loss of memory, which is caused by the dif-
learn to read words on the lips (Merzenich, 2005).
ficulty of recording new events due to a decreased speed of
information processing and a deterioration in their sharpness Merzenich has identified a number of strategies to overcome
and accuracy. The difficulty in finding words, a common phe- these problems:
nomenon in elderly people, is reconnected by Merzenich to a
form of atrophy which leads to an unclear representation of • To combat disuse: engage the brain in new challenging
tasks;
sounds and words, which consequently induces confused and
• To help the brain to order confusing signals: carry out
disorderly memory traces. The exercises are proposed in a play-
activities that require attention and concentration;
ful form and consist of computer activities in which learners
• To regulate the production of neuromodulators: activities
must respond to certain stimuli by completing levels of increas-
able to activate their production;
ing difficulty. Exercises were designed on the basis of studies
• To eliminate compensatory adaptive behaviors: engaging in
conducted with experiments and neuroimaging techniques activities that have become complicated to perform, rather
about the restructuring and reorganization of cortical functions. than avoid them.
That is why these activities reach the goal of reactivating mental
The most effective activities are those in which is required to
function in elderly people.
distinguish between what one hears, sees and feels and use this
information to achieve goals more and more difficult.
5. Neuroplasticity: learning for a lifetime
The current research shows that substantial changes occur in 6. New learning and teaching strategies to
cortical areas and that learning, thought and action deeply address the challenge of adult education
transform functional anatomical structures of the brain. The
Learning in mature age seems to be the most problematic: se-
brain ageing is reversible, as neuroplasticity is bidirectional: it
nile involution related to brain tissues’ ageing causes a loss of ef-
can cause the deterioration of the brain or its improvement.
ficiency of the mind that progresses with age and that makes it
The physical, chemical and functional brain decline is caused by
even more complex the design and implementation of training
changes that give rise to a process of negative plasticity, causing
programs tailored to the characteristics of older learners. The
a vicious circle of deterioration that includes four components:
researches in neuroplasticity confirm that learning in adult and
Disuse. The brain functions respond to the “use or lose it” rule; mature age can be successfull if we engage our brain in new
elderly people often limit themselves to carry out familiar and challenging tasks, dealing with complex and problematic activi-
repetitive mental activities, routines requiring no application ef- ties. Learning depends completely on the existence of neuro-
fort or acquisition of new skills. This kind of activity is not suffi- plasticity: it allows new information to be retained, represented
cient to keep the brain fully functioning: if we stop learning new and processed. The challenge the adult education is called to
things, we are destined to ageing brain. meet is to transform old pedagogic models, rethinking adult
learning in a perspective of flexibility and personalization re-
“Noisy” processes. In old people brain sensory deterioration
flecting the increasing complexity and fluidity of real world (Wil-
causes noise; for example, in hearing loss the sound signals sent

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lis, 2010; Keeling, Tevens Dickson & Avery, 2011; Boulton-Lewis a stable, structured and organized system. The application of
& Tam, 2012; Hartman-Stein & La Rue, 2011). connectivism-based learning strategies requires the reversal of
traditional learning patterns. The first students’ reaction is gen-
The peculiarities of the adult and his specificity as a learner
erally of defence, rejection and cognitive dissonance, caused by
require the development of andragogical strategies and ap-
the habit to live the educative process as relegated in a struc-
proaches that respond specifically to his needs, identifying the
tured and “protected” environment. This dissonance represents
factors and variables to be monitored to make effective the
a first indicator of the beginning of a change for the learner;
training action. The recent studies in adult education and gera-
this is the first step to make an effort carrying out stimulating
gogy field highlight how learning in mature age is characterized
and not repetitive tasks, and the opportunity to fight the brain
by its olistic nature, problem-centered, contextualized and per-
disuse.
sonalized (Guglielman, 2004; Guglielman et al., 2005).
One innovative educational model able to meet this challenge
Adult learning experience should be developed taking into ac-
is Complex Learning (McDonald, 2005; Rohse, Anderson, 2006;
count learner’s priorities, motivation, learning needs, learning
Van Merriënboer, Clark & de Croock, 2002); under this term
request, previous knowledge, previous learning experiences,
we can recognize various visions and interpretations, referring
previous competences, and potential areas of development;
to common principles but realizing practices in different ways
the learning effort should be oriented towards an experience
(Ferri, 2003). In this model is clearly recognizable the reconfigu-
focused on themes and problems significantly connected to
ration among several didactic means and tools, the emergence
real life, useful and usable in daily practice. In this perspective
of new nexuses and hierarchies among media, the appearance
a course need to be focused on themes and problems instead
of new languages and new interaction modalities. In Complex
of contents and disciplines; it needs to adopt a situational ap-
Learning the term “complex” refers to the problematic nature
proach instead of theoretical approach; it should include con-
of reality and, consequently, of knowledge: learning is, in fact,
crete tasks; it should indicate a usable application also referable
a complex activity. According to complexity and chaos theories,
to daily life.
human cognition can be viewed as a complex system, that in-
Moreover, should be proposed strategies and activities that teracts with its environment and can be modified by it; tradi-
exploit the principles of neuroplasticity to improve cognitive tional approaches often don’t adequately address the complex
function and ensure that education in old age is an enjoyable, and multi-dimensional nature of cognition. The learning experi-
rewarding and effective experience. First of all it is necessary ence is not limited in the course boundaries: learner interacts
to change a consolidated mental attitudes about learning and not only with his peers and with the course staff, but also with
about teaching, taking in mind the complexity of new hybrid, domain experts, key actors, stakeholders, individuals and com-
ubiquitous and liquid learning scenarios. The Scaffolding Theory munities sharing his interests at both formal and informal level
of Ageing and Cognition (STAC) postulates that changes with (Guspini, 2008; Guglielman & Vettraino, 2009).
ageing are a part of a process of compensatory cognitive scaf-
The integration among different educational procedures, com-
folding aiming to alleviate the cognitive decline of ageing. This
munication tools and technologies contributes to develop and
process is fostered by cognitive engagement, exercises, new
improve learning in the age of knowledge, generating value
learning and consists in the recruitment of additional brain cir-
and competitiveness. The chance to create a customized en-
cuits supporting declining structures that has become noisy or
vironment deeply changes the way we learn: the structure of
inefficient (Park & Reuter-Lorenz, 2009; Park & Bischof, 2011).
a learning environment, in fact, directs the student to certain
Older foundations of thought were based on a linear stage de- learning schemes, fostering from time to time dynamics linked
velopment concept. The paradigm of connectivism, that consid- to the space design and its features (Goodyear, 2001). Active
ers learning as a process of building nets and connections, ap- involvement of the student in designing and building his space
pears particularly close to this vision: according to this theory, represents an innovation compared to models that offer prear-
knowledge is chaotic, complex and holistic, reticular and not lin- ranged learning environments.
ear (Siemens, 2004, 2006). Our life experience reflects the net
system of interconnections; knowledge assumes the contours
of a volatile changeable, dialogic entity rather than the form of

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7. Conclusions
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The Ageing Brain: Neuroplasticity and Lifelong Learning

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