Science and techno world topic: Psychology
The monkeys are able to learn by observing a human model:
a discovery that opens new perspectives in the study of mechanisms of learning.
Photo: A female rhesus macaque with her young in the
Bandhavgarh National Park, India. Photography by- David Pattyn / Nature
Photo / Corbis
So far it seemed that the monkeys could learn just by
observing the behavior of other monkeys but the new study published in the
journal PLoS One by Aldo Genovesio, researcher in neurophysiology at
the Sapienza University of Rome, demonstrates for the first time in primates
that learning can take place even from the observation of a human model.
Previous studies had shown that monkeys learn by observing
other monkeys, but was not yet clear whether this could happen even with the
observation of a human model.
In the first part of the experiment, conducted by a team
of researchers in Italy, a person - observed at close range by two macaques -
had to solve a simple problem of learning. It consisted of doing the choice of
an object "correct" under which a reward was hidden, usually
fruit. Later the same problem was directly subjected to the two primates.
In 70 percent of those cases, the primates were able to make the correct choice
and got the reward.
In their experiment, Italian researchers have decided to
add a slight variant known - and so far only used in the studies on human
psychology - as a "vicarious reinforcement" (vicarious reinforcement conditioning
is an action that affects the person who performs the action, in this case, the
monkey, but the model to be imitated, are humans). This was not included in
previous studies. Many researches conducted on human behavior have shown,
for example, that children learn by imitation when they see a reference model,
an adult or another child who receives an award - that is, vicarious
reinforcement - if he has reached the correct action. The use of the
reinforcement vicarious, until now, had only been used in studies monkey -
monkey, while for the first time, researchers have applied in a model monkey -
man. In practice, in the experiment conducted by Genovesio-model every
time the person who solved the problem and earned the reward, had to eat it!
According Genovesio "This study not only demonstrate
for the first time that monkeys can learn by observing the man, not only their
conspecifics, also has important implications for understanding the neural
basis of learning, such as mirror neurons."
Mirror neurons, which are a specific type of neurons
originally discovered in monkeys and later humans, are activated when
performing a certain action is when you observe it, and the students are the
basis of the mechanisms of understanding and learning. Moreover, their
response also varies according to the subjective value that is given by the
observer to the action that is observed. In some studies in macaques, for
example, researchers have discovered that their mirror neurons provide a much
stronger response when the animal observes an action that involves an object
that has some value, such as a result of their liking, but if the observation
in monkeys of mirror neurons is simple, in humans is more complicated and can
only be done under indirect observation techniques such as MRI.
Thus, according to the authors of the new study, now that
it has been demonstrated that monkeys interacting with humans just as they do
with their conspecifics, their new model "ape-man and vicarious
reinforcement" can be used in future applied research understanding of the
role of mirror neurons and the complex neural mechanisms that regulate learning
by imitation.
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