The research on children's cognitive development shows that bonuses and green light stimulation begin to appear in the third month after the baby is born, but they are unstable. The fourth month is relatively stable. That's why we usually only show black and white pictures to babies under three months old.

In infancy, that is, after one year old, children's ability to distinguish subtle differences in colors will continue to develop, and the ability to combine color discrimination with mastering color names will continue to develop.

In early childhood (3-4 years old), children can initially identify basic colors such as red, orange, yellow, green and blue, but it is often difficult to debate mixed colors such as purple and similar colors such as blue and sky blue, and it is also difficult to name colors correctly.

In children's middle age (4-5 years old), most of them can recognize basic colors and approximate colors, and can name the basic colors.

In the late childhood (5-6 years old), children can not only recognize colors, but also use various colors to call out the colors they need when painting, and can correctly name black and white, red, yellow, blue, red, brown, gray, purple, pink and other colors.

At present, I can recognize the basic colors such as red, orange, yellow, green and blue every year, and I can also name these basic colors. Gymboree's teacher was surprised when she did a simple test in Gymboree last weekend, because she was less than 2 years old every year, so that the teacher thought that she often took early education classes and was trained every year. Compared with the results of the above visual development research, the cognition of color has reached the level of 3-4 years old every year.

Yan Yan, who is completely the same age, is not so sensitive to color. She can only accurately tell several contrasting colors such as black and white, red and yellow. I think this is not to say that the cognitive development of the mind lags behind the yearning, but that there are individual differences in the morning and evening of cognitive development.

2? (sense of) hearing

There are great individual differences in children's auditory sensitivity, and the sensitivity varies from person to person. But this difference is not an inherent constant. Children's hearing is constantly developing under the influence of living conditions and education, and their hearing sensitivity is constantly improving with age. It is found that children's auditory sensitivity has been improving until 12- 13 years old, and the auditory sensitivity of 8-year-old children is almost twice as high as that of 6-year-old children.

Although children can't hear clearly and completely what others say, they can often guess what others say correctly according to the speaker's facial expression, lip movements and the situation at that time. This phenomenon is called "hard of hearing". "Hard of hearing" is a manifestation of children's hearing impairment, which will have a negative impact on children's speech perception, speech and intellectual development.

I don't agree with the above conclusion. Because I find that the hearing of missing is the most sensitive in our family to some extent. They are always the first to hear the sound from far and near, and they are also very alert to the sound at home. Of course, this may be because of their curiosity about the world, but there is no denying that their hearing is really good, not worse than that of adults. However, their voice discrimination ability is far less than that of adults, otherwise they would have spoken all kinds of voices long ago and would not be slurred up to now.

I am surprised at the harm of "hard of hearing".

"Hard of hearing" is a manifestation of children's hearing impairment. This sentence is easy to understand. After all, children's hearing is really developing and improving, which means that all children's hearing is gradually improving from defects. However, "hard of hearing" will have a negative impact on children's speech perception, speech and intellectual development. This conclusion is too general. In fact, isn't "hard of hearing" to make the development of listening and speech perception, speech and intelligence complement and promote each other? According to the speaker's facial expression, lip movements and the situation at that time, correctly guessing what others say is not a way to correct listening? If not, why did I express my three children with exaggerated expressions, sounds, movements and other auxiliary languages during the enlightenment period, which made them more willing to listen and easier to understand?

This problem needs to be studied.