transmit the sensory impulse to the appropriate part of the brain or spinal cord for interpretation and processing; also known as association neurons.
depth. 1  the distance from the top downward, from the surface inward, or from front to back. 2  perspective, as in a painting. 3  the quality or condition of being deep; deepness; specif., 4  intensity, as of colors, silence, or emotion.
Space, or depth, is the eponymous property of our 3-dimensional world. It refers to the area that a shape or form occupies. Space can be defined as positive or negative. 1  Positive space is the filled space, the object(s) or element(s) in the design. 2  Negative space is the empty space, or the open space between design elements or objects, such as a background.