Only people with developed left and right brains can draw circles and squares with one hand. A trained person can do it. People with good coordination skills can do this.
The operation of the left hand is controlled by the right brain, and the operation of the right hand is controlled by the left brain. If both hands operate at the same time, the left and right brains need to coordinate at the same time. People with poor coordination may experience out-of-synchrony or preoccupation with their dominant hand.
People usually think with only one right brain, but not everyone thinks with the right brain. Some people also develop left-brain thinking, so why they can't draw circles with one hand is uncertain.
Extended information:
Left and right brain training methods:
The left hemisphere is mainly responsible for logical understanding, memory, time, language, judgment, arrangement, classification, logic , analysis, writing, reasoning, inhibition, five senses (sight, hearing, smell, touch, taste), etc. The way of thinking has continuity, continuity and analysis. Therefore, the left brain can be called the "conscious brain", "academic brain", and "language brain".
The right hemisphere is mainly responsible for spatial image memory, intuition, emotion, body coordination, visual perception, art, music rhythm, imagination, inspiration, epiphany, etc. The way of thinking is disordered, jumpy and intuitive. wait. Sperry believes that the right brain has imaging functions, such as planning, creativity, and imagination.
Vibration functions related to the universe, such as sixth sense, clairvoyance, intuition, inspiration, dreams, etc.; ultra-high-speed automatic calculation functions, such as mental arithmetic and mathematics; ultra-high-speed mass memory , such as speed reading and memory. The right brain is like Dr. Almighty, good at finding multiple solutions to problems. Many advanced thinking functions depend on the right brain.
Baidu Encyclopedia—Sperry’s left- and right-brain division of labor theory