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The characteristics of brain development of infants and young children are the most basic conditions for the efficacy of "flash card".

"Flash card" is a visual stimulation card in a broad sense. It aims to establish a high-quality visual nerve circuit in the infant stage (0-3 years old). Through rich external visual stimulation means, it can enhance the imagination and logical thinking ability of infants, strengthen the visual cognition of infants, cultivate the visual acuity of infants, improve the visual attention and observation ability of infants Develop infants' stereovision, and visual integration.

1. One of the characteristics of brain development in infants: 0-3 years old is the key period of brain development

The most critical period for the brain development of infants is 0-3 years old, because the brain development speed of the human body is the fastest in the infant stage (0-3 years old), especially when it is 0-6 months old, which is called the super fast stage. This can be confirmed by the development of the head circumference. From conception to birth, the periphery of the head increases from zero to 35 cm. From birth to two and a half years old, it increases by another 15 cm, and from two and a half years old to adult, but it only increases by another 5 cm, and most of the increase before the age of six.

1. The second characteristic of infant brain development: rich external stimulation is the core

Before birth, when the fetus is still in the womb, hundreds of billions of brain cells begin to form. Once brain cells are formed, they enter the stage of waiting to be stimulated. Only after receiving stimulation from the outside world, synapses between brain cells are formed, and with the increase of stimulation, complex information networks are formed. In this way, the brain can produce a series of functions such as vision, hearing, touch, taste, and smell, and gradually develop into motor ability, language ability, and hand ability.

Moreover, only those brain cells that are often used and appropriately stimulated repeatedly and in large quantities can be strengthened and further developed into important permanent brain neural networks, while those brain cells that are not fully used will be eliminated. To put it simply, hundreds of billions of brain cells in the brain are like "blank disks". After rich stimulation, these "disks" leave information, and an information "highway" is established between these "disks", which enriches the brain's information resources and communication channels. The more stimulation, the less "blank disk" left, and the more "disk" contacts with information. Moreover, the visual stimulation card only carries out visual pathway training from the visual aspect. Of course, if combined with the stimulation training of hearing, touch, and other sensory perceptions, it will wake up more brain cells and establish connections, which is also very beneficial for infants and young children. But one thing to be clear here is that most of the "flash cards" are mainly visual stimulation, so just using the "flash card" cannot represent the stimulation training of other senses.

To sum up, "flash card" is a visual pathway training method aimed at establishing more synaptic connections between brain cells during the prime time of infant brain development. This stimulation training provides important help for the baby's brain development in the future or a benign reserve. A lot of practice has proved that this is very helpful for children's cognitive promotion.

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