Transcript IVAN PAVLOV

IVAN PAVLOV
INTRODUCTION
Ivan Pavlov was born in a small village called Ryzan in central Russia. Ivan Pavlov’s
family wanted and would have liked him to be a priest, but the reading of Charles Darwin
who was a scientist influenced Pavlov to become interested in the scientific field.
Although his parents did not approve his decision, Pavlov carried on with what he liked
to do. Ivan Pavlov attended the University of St.Petersburg, and there he studied
chemistry and physiology, and also he received his Doctorate there in 1879. He continued
to study and do research on his own that interested him, such as the Pavalovian
Conditioning that led him to be awarded with the noble prize for physiology and
medicine in 1904. After all his work and findings in life he came to the end of his life at
the age of 87 in 1986.
FIELD OF RESEARCH
Pavlov became a well-known psychologist after his work with dogs and studying
digestion. He developed a theory called ‘Classical’ or ‘Pavlovian Conditiong’.
In Classical Conditioning, an unconditioned stimulus (US) is an event that
causes a response to occur, which is referred to as the unconditioned response
(UR). And, in Pavlov's study with dogs, the food within the dog's mouth is the
US, and the salivation that results is the UR. Paired with the US, Pavlov added
an element known as the non-excitatory, conditioned stimulus (CS). Pavlov
used a metronome as the CS which he rang first, then fed the dogs. After
repeating this procedure several times, Pavlov was able to remove the US (food)
and by only ringing the bell the dogs would salivate (CR). Since the bell alone
now produced the unconditioned response (salivation), the association had been
established (Conditioned). Pavlov continued to present the CS with any pairing
with the US until the CR no longer occurred. This elimination of the CR is
known as extinction. However, waiting a few days and then reintroducing
ticking metronome resulted in the dogs once again salivating to the CS. Pavlov
termed this, spontaneous recovery.
EXAMPLE
The site or smell of food (the unconditioned stimulus)
causes the dog to salivate (the unconditioned response).
Ordinarily a neutral stimulus, such as a bell
ring does not cause the dog to salivate.
There is no response to food, only to a sound
where the dog may move it's ears.
Continued
We can however condition the dog to respond to the tone.
Simply ring the bell and immediately follow it with food.
This should be repeated several times.
Eventually, the dog will salivate
(conditioned response)
at the sound of the bell alone (the
conditioned stimulus).
The dog has associated the tone with food
and has been conditioned
IMPORTANT CONTRIBUTION TO
THE STUDY OF SOCIAL
SCIENCES.
Beginning of 1930, Pavlov tried to apply his laws to the explanation of human Psychoses. He assumed
that the excessive inhibition characteristic of a psychotic person was a protective mechanism-- shutting
out the external world – in that it excluded injurious stimuli that had previously caused extreme
excitation.
In Russia this idea became the basis for treating psychiatric patients in non stimulating external
surroundings. During this period Pavlov announced the important principle of the language function in
the human as based on long chains of conditioned reflexes involving words. The function of language
involves not only words, he held, but elaboration of generalizations not possible in animals lower than
the humans.
INTRESTING INFORMATION
Not only was Pavlov able to stimulate salivation through the sound of a
metronome. . He replaced the metronome with other stimuli for use as the
Conditional Stimulus. He conditioned the dogs using a buzzer, the flash of a
light, a touch on the dog's harness, and the use of different pitches of a whistle
in which the dogs had to differentiate between to determine which pitch
resulted in access to food.
He also wrote a book called conditioned reflexes.
He was awarded the Nobel Prize for Physiology or Medicine in 1904 for his
work on digestive secretions.
THE END