The Baldwin effect is named after an American Philosopher, James Mark Baldwin; who is well known for his significant contributions to early psychology, psychiatry, and the Theory of Evolution. In Evolutionary biology, the Baldwin effect explains the effect of the learned behavior on evolution. In other words, James Mark Baldwin and his other co-workers suggested during the theory of Darwin in the late 19th century, that an organism has a unique ability to learn new behaviors as to adjust and adapt itself to the new condition in surroundings.
The ability of an organism will affect its reproductive success rate and will in turn have an effect on the genetic makeup of the particular species through natural selection. Though while looking into it, this process appears somewhat same to the Lamarckian evolution that was given by Lamarck. Lamarck proposed that living things inherit the characters that they acquire from their parents. The Baldwin effect has also been proposed independently many times, and even today, it is generally regarded as an essential part of the modern synthesis.
The effect before it was first named, was put forward in 1896 in a paper that contained the title, “A New Factor in Evolution” by James Mark Baldwin. The paper then proposed a mechanism for a specific selection for its general learning ability. Sir Robert Richards, a well-known professor of History of Science & Medicine explained that if any animal is made to enter a new environment or their old environment is rapidly changed, then those organisms can easily respond to this change by learning the new behaviors to survive or adapt. This adaptation would be naturally preserved over several generations to come and thus all the subsequent generations will have the advantage to easily live in the new environment.
It might look that the acquired traits had taken up this hereditary scheme in a Lamarckian fashion as given by Lamarck, but actually, the process is really a neo-Darwinian one. Selected offspring of this Baldwin effect would in no doubt have increased capacity in gaining the ways and learning the new skills rather than being restricted to one genetic code, and also to the relatively fixed abilities. This effect puts up an emphasis on the fact that the sustained behavior of the species or a group of species can give a shape to the evolution of that species.
The Baldwin effect can be better understood while studying evolutionary biology as a phase; in which there occurs a change in any character or any trait. This change that is occurring within an organism as a result of its interaction with its surrounding changing environment, becomes gradually absorbed by an organism into its developmental genome. There was also an update to this Baldwin Effect. It was developed by three scientists namely Jean Piaget, Paul Weiss, and Conrad Waddington in the year 1960. This new version included an extraordinary role of the social environment in shaping the natural change in humans which maybe both, evolutionary as well as developmental.
For the reference, just Suppose that there are some species that are threatened by a new predator and there is a particular kind of behavior that makes it more difficult for the predator to kill every individual of the species. So, in this case, the individuals who learn the behavior more quickly will obviously have an advantage in this. As time changes, the ability to learn the behavior of an individual will improve owing to the genetic selection and a point will come where it will seem to be just an instinct.
In the initial days, Baldwin’s ideas were not incompatible with the occurrences, but they were not certain. The ideas regarding the mechanism of transmission of all hereditary information were further put up by at least two other biologists in 1896. They also have very similar ideas like that of Baldwin. In around 1901, Maurice Maeterlinck referred to the adaptations in the behavior of an organism to the climates in different species of bees. The Baldwin effect theory with time became more controversial, with scholars being split between the “Baldwin Boosters” and “Baldwin Skeptics”.
The theory was first called out to be the “Baldwin effect” by George Gaylord Simpson in around 1953. He also explained that the idea of Baldwin was theoretically consistent (not inconsistent with the modern synthesis) but at the same time he doubted that the phenomenon occurred very often or in short intervals. In his discussion of the explanation of the Baldwin-effect theory Simpson also pointed out that the theory appears to give us a unique reconciliation between the neo-Darwinian and a neo-Lamarckian theory. At the same time, he argued that the Mendelism and the later genetic theories ruled out the extreme neo-Lamarckian position.
In 1942, the evolutionary biologist Julian Huxley also greatly promoted the Baldwin effect as part of the modern synthesis and said that the concept had been unduly ignored by some of the evolutionists. Paul Griffiths also suggested two major reasons for the continued interest in the Baldwin effect. The first is the role that the mind is understood to play in this effect and second is the connection between the development and evolution in the effect. Thus, the Baldwin effect played a major role in explaining the evolutionary sciences and also became a reference for various researches in further areas.