To go back to the original OP theme:

'' The average IQ of the world's population, which has steadily risen from the post-war to the late 90 s, has decreased over the last twenty years...
This is the flipping of the Flynn effect.
It seems that the level of intelligence measured by testing is decreasing in the most developed countries.
Many can be the causes of this phenomenon.
One of them could be the impoverishment of language.
Several studies show that lexical knowledge and language impoverishment are decreasing: it is not just about reducing the vocabulary used, but also the linguistic subtleties that help to develop and formulate complex thinking.
The progressive disappearance of times (subjunctive, imperfect, compound forms of the future, participant past) gives rise to a thought almost always to the present, currently limited: unable to projections in time.
Simplifying tutorials, disappearing capitals and punctuation are examples of '' deadly blows '' to the accuracy and variety of expression.
Just an example: deleting the word '' young girl '' (now obsolete) does not only mean abandoning the aesthetics of a word, but also unintentionally promoting the idea that there are no intermediate stages between a child and a woman.
Fewer words and fewer conjugated verbs involve less ability to express emotions and fewer possibilities for thought development.
Studies have shown that violence in the public and private spheres comes directly from the inability to describe one's emotions through words.
No words to build a reasoning, complex thinking is made impossible.
The poorer the language, the more thought disappears.
The story is rich in examples and many books (Georges Orwell - '' 1984 "; Ray Bradbury - '' Fahrenheit 451 '') told how all totalitarian regimes have always hindered thought, by reducing the number and the number meaning of words.
If there are no thoughts, there are no critical thoughts. And there is no speechless thinking.
How can you build hypothetical deductive thought without conditional?
How can you look at the future without conjugation with the future?
How can you capture a storm, a succession of elements in time, whether past or future, and their relative duration, without a language that distinguishes what could have been, what was, what is, what? could be, and what will be after what could have happened, did it really happen?
Dear parents and teachers: let's talk, read and write our children, our students. Teaching and practicing language in its most different forms. Even if it seems complicated. Especially if it's complicated.
Because in this effort there is freedom.
Those who claim the need to simplify spelling, purge the tongue of one's ' flaw s', abolish genres, times, nuances, anything that creates complexity, are the real artisans of impoverishing the human mind .....
There is no freedom without necessity.
There is no beauty without the thought of beauty
Sources:
Christophe Clavé
Graduated Sciences-Po Paris, MBA holder, professional coach, Christophe Clavé spent 25 years in business, as a HRD then Executive Director. He was also in charge of the Corporate Strategy and Policies course at HEC Paris for 5 years.