what does this mean in area-4 of the brain Body representation: the body is topographically represented in an inverted (head-down) and crossed (opposite side) manner
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This means that in area-4 of the brain, the representation of the body is organized in a specific pattern. The body is represented in a topographical manner, meaning that different parts of the body are mapped out in specific locations within this brain area. However, this representation is inverted, which means that the bottom part of the body is represented towards the top of the brain area, and the top part of the body is represented towards the bottom of the brain area. Additionally, the representation is crossed, which means that the left side of the body is represented towards the right side of this brain area, and vice versa. This arrangement of body representation in area-4 is often referred to as an "inverted and crossed" organization.