The child makes perceptual discriminations involving color, shape, size, use, number, missing parts, and symbolic material.
Other researchers have argued that this difficulty is not specific to speech but reflects a general perceptual difficulty with the processing of rapidly timed events, of which speech is the most taxing example.
The Mullen Scales of Early Learning is a comprehensive assessment of language, motor, and perceptual abilities in children from birth to five years eight months of age.
Schemas-Fundamental core beliefs or assumptions that are part of the perceptual filter people use to view the world.
Some tests use developmental ages to describe a child's physical, perceptual, social, and emotional maturity.